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1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"security","context":"product","tag":"link","label":"security_link_product_navbar"}" href="https://github.com/features/security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon 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data-action=" combobox-commit:query-builder#comboboxCommit mousedown:query-builder#resultsMousedown " data-target="query-builder.resultsList" data-persist-list=false id="query-builder-test-results" ></ul> </div> <div class="FormControl-inlineValidation" id="validation-c8b84f66-0a54-4cc6-a43c-a50949e38cd7" hidden="hidden"> <span class="FormControl-inlineValidation--visual"> <svg aria-hidden="true" height="12" viewBox="0 0 12 12" version="1.1" width="12" data-view-component="true" class="octicon octicon-alert-fill"> <path d="M4.855.708c.5-.896 1.79-.896 2.29 0l4.675 8.351a1.312 1.312 0 0 1-1.146 1.954H1.33A1.313 1.313 0 0 1 .183 9.058ZM7 7V3H5v4Zm-1 3a1 1 0 1 0 0-2 1 1 0 0 0 0 2Z"></path> </svg> </span> <span></span> </div> </div> <div data-target="query-builder.screenReaderFeedback" aria-live="polite" aria-atomic="true" class="sr-only"></div> </query-builder></form> <div class="d-flex flex-row color-fg-muted px-3 text-small color-bg-default search-feedback-prompt"> <a target="_blank" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax" data-view-component="true" class="Link color-fg-accent text-normal ml-2"> Search syntax tips </a> <div class="d-flex flex-1"></div> </div> </div> </div> </div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div 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method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="hAZKWtSHLevHY8ddSQSmiil4c+voOtBCdoOGUgdfL73P2zduJHanEiimr6OMWbqXVQCQmsNl1R4X6/9klEtpeA==" /> <p>We read every piece of feedback, and take your input very seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" aria-modal="true" aria-labelledby="custom-scopes-dialog-title" aria-describedby="custom-scopes-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header Overlay-header--divided"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="custom-scopes-dialog-title"> Saved searches </h1> <h2 id="custom-scopes-dialog-description" class="Overlay-description">Use saved searches to filter your results more quickly</h2> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="custom-scopes-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> </option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" 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dir=\"auto\"\u003eCrossref REST API\u003c/h1\u003e\u003ca id=\"user-content-crossref-rest-api\" class=\"anchor\" aria-label=\"Permalink: Crossref REST API\" href=\"#crossref-rest-api\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDEPRECATION NOTICE\u003c/h1\u003e\u003ca id=\"user-content-deprecation-notice\" class=\"anchor\" aria-label=\"Permalink: DEPRECATION NOTICE\" href=\"#deprecation-notice\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe Crossref REST API has been updated to use Elasticsearch instead of Solr -- read more about that project \u003ca href=\"https://www.crossref.org/blog/behind-the-scenes-improvements-to-the-rest-api/\" rel=\"nofollow\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis documentation is \u003cstrong\u003edeprecated\u003c/strong\u003e. Documentation for the new API can still be found at \u003ca href=\"https://api.crossref.org/\" rel=\"nofollow\"\u003ehttps://api.crossref.org/\u003c/a\u003e, and issues should be reported to us via the \u003ca href=\"https://community.crossref.org/\" rel=\"nofollow\"\u003ecommunity forum\u003c/a\u003e or \u003ca href=\"mailto:support@crossref.org\"\u003esupport@crossref.org\u003c/a\u003e.\u003c/p\u003e\n\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#crossref-rest-api\"\u003eCrossref REST API\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#preamble\"\u003ePreamble\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#meta\"\u003eMeta\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#api-overview\"\u003eAPI overview\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#result-types\"\u003eResult types\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#resource-components\"\u003eResource components\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#parameters\"\u003eParameters\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#queries\"\u003eQueries\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#field-queries\"\u003eField Queries\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#sorting\"\u003eSorting\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#facet-counts\"\u003eFacet counts\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#filter-names\"\u003eFilter names\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#result-controls\"\u003eResult controls\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#api-versioning\"\u003eAPI versioning\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#documentation-history\"\u003eDocumentation history\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePreamble\u003c/h2\u003e\u003ca id=\"user-content-preamble\" class=\"anchor\" aria-label=\"Permalink: Preamble\" href=\"#preamble\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe Crossref REST API is one of \u003ca href=\"https://www.crossref.org/services/metadata-delivery/\" rel=\"nofollow\"\u003ea variety of tools and APIs\u003c/a\u003e that allow anybody to search and reuse our members' metadata in sophisticated ways.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you read nothing else, please at least look at the \u003ca href=\"https://github.com/CrossRef/rest-api-doc/blob/master/api_tips.md\"\u003eAPI TIPs\u003c/a\u003e document and the \u003ca href=\"https://github.com/CrossRef/rest-api-doc#etiquette\"\u003e\"Etiquette\" section\u003c/a\u003e of this document. It will save you (and us) much heartburn.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMeta\u003c/h2\u003e\u003ca id=\"user-content-meta\" class=\"anchor\" aria-label=\"Permalink: Meta\" href=\"#meta\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFrequency of indexing\u003c/h3\u003e\u003ca id=\"user-content-frequency-of-indexing\" class=\"anchor\" aria-label=\"Permalink: Frequency of indexing\" href=\"#frequency-of-indexing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eRecords typically appear in the REST API within 20 minutes of their having been successfully deposited with Crossref.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSummary information (e.g. counts, etc.) are processed in batch every 24 hours.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLearning about performance or availability problems\u003c/h3\u003e\u003ca id=\"user-content-learning-about-performance-or-availability-problems\" class=\"anchor\" aria-label=\"Permalink: Learning about performance or availability problems\" href=\"#learning-about-performance-or-availability-problems\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe record and report service issues on our \u003ca href=\"https://status.crossref.org\" rel=\"nofollow\"\u003estatus page\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eYou might want to check this to see if we are already aware of a problem before you report it.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe also post notice of any ongoing performance problems with our services on our twitter feeds at \u003ca href=\"https://twitter.com/CrossrefOrg\" rel=\"nofollow\"\u003eCrossrefOrg\u003c/a\u003e and \u003ca href=\"https://twitter.com/@CrossrefSupport\" rel=\"nofollow\"\u003eCrossrefSupport\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReporting performance or availability problems\u003c/h3\u003e\u003ca id=\"user-content-reporting-performance-or-availability-problems\" class=\"anchor\" aria-label=\"Permalink: Reporting performance or availability problems\" href=\"#reporting-performance-or-availability-problems\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eReport performance/availability at our \u003ca href=\"https://support.crossref.org/hc/en-us\" rel=\"nofollow\"\u003esupport site\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReporting bugs, requesting features\u003c/h3\u003e\u003ca id=\"user-content-reporting-bugs-requesting-features\" class=\"anchor\" aria-label=\"Permalink: Reporting bugs, requesting features\" href=\"#reporting-bugs-requesting-features\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePlease report bugs with the API or the documentation on our \u003ca href=\"https://gitlab.com/crossref/issues\" rel=\"nofollow\"\u003eissue tracker\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDocumentation License\u003c/h3\u003e\u003ca id=\"user-content-documentation-license\" class=\"anchor\" aria-label=\"Permalink: Documentation License\" href=\"#documentation-license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://creativecommons.org/licenses/by/4.0/\" rel=\"nofollow\"\u003e\u003cimg alt=\"Creative Commons License\" src=\"https://camo.githubusercontent.com/378f603d990dc28fffb37a14fda1a9242bc7828411ffad53782feaf21c65e51c/68747470733a2f2f692e6372656174697665636f6d6d6f6e732e6f72672f6c2f62792f342e302f38387833312e706e67\" data-canonical-src=\"https://i.creativecommons.org/l/by/4.0/88x31.png\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003cbr\u003eThis work is licensed under a \u003ca href=\"https://creativecommons.org/licenses/by/4.0/\" rel=\"nofollow\"\u003eCreative Commons Attribution 4.0 International License\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMetadata License\u003c/h3\u003e\u003ca id=\"user-content-metadata-license\" class=\"anchor\" aria-label=\"Permalink: Metadata License\" href=\"#metadata-license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCrossref asserts no claims of ownership to individual items of bibliographic metadata and associated Digital Object Identifiers (DOIs) acquired through the use of the Crossref Free Services. Individual items of bibliographic metadata and associated DOIs may be cached and incorporated into the user's content and systems.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrivacy\u003c/h3\u003e\u003ca id=\"user-content-privacy\" class=\"anchor\" aria-label=\"Permalink: Privacy\" href=\"#privacy\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe also have a \u003ca href=\"https://www.crossref.org/privacy/\" rel=\"nofollow\"\u003eprivacy policy\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLibraries\u003c/h3\u003e\u003ca id=\"user-content-libraries\" class=\"anchor\" aria-label=\"Permalink: Libraries\" href=\"#libraries\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou might be able to avoid reading all this documentation if you instead use one of the several excellent libraries that have been written for the Crossref REST API. For example:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://gitlab.com/crossref/crossref_commons_py\" rel=\"nofollow\"\u003ecrossref-commons\u003c/a\u003e (Python, developed by Crossref)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/sckott/habanero\"\u003ehabanero\u003c/a\u003e (Python)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/sckott/serrano\"\u003eserrano\u003c/a\u003e (Ruby)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/ropensci/rcrossref\"\u003ercrossref\u003c/a\u003e (R)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/fabiobatalha/crossrefapi\"\u003ecrossrefapi\u003c/a\u003e (Python)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/MattsSe/crossref-rs\"\u003ecrossref-rs\u003c/a\u003e (rust)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/naustica/Pitaya\"\u003epitaya\u003c/a\u003e (Julia)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIf you know of another library you would like to see listed here, please let us know about it via the \u003ca href=\"https://gitlab.com/crossref/issues\" rel=\"nofollow\"\u003eissue tracker\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEtiquette\u003c/h3\u003e\u003ca id=\"user-content-etiquette\" class=\"anchor\" aria-label=\"Permalink: Etiquette\" href=\"#etiquette\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe want to provide a public, open, and free API for all. And we don't want to unnecessarily burden developers (or ourselves) with cumbersome API tokens or registration processes in order to use the public REST API. For that to work, we ask that you be polite and try not to do anything that will take the public REST API down or otherwise make it unusable for others. Specifically, we encourage the following polite behaviour:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eCache data so you don't request the same data over and over again.\u003c/li\u003e\n\u003cli\u003eActively monitor API response times. If they start to go up, back-off for a while. For example, add pauses between requests and/or reduce the number of parallel requests.\u003c/li\u003e\n\u003cli\u003eSpecify a \u003ccode\u003eUser-Agent\u003c/code\u003e header that properly identifies your script or tool and that provides a means of contacting you via email using \"mailto:\". For example:\n\u003ccode\u003eGroovyBib/1.1 (https://example.org/GroovyBib/; mailto:GroovyBib@example.org) BasedOnFunkyLib/1.4\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThis way we can contact you if we see a problem.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ereport problems and/or ask questions on our \u003ca href=\"https://gitlab.com/crossref/issues\" rel=\"nofollow\"\u003eissue tracker\u003c/a\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eAlas, not all people are polite. And for this reason we reserve the right to impose rate limits and/or to block clients that are disrupting the public service.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGood manners = more reliable service.\u003c/h3\u003e\u003ca id=\"user-content-good-manners--more-reliable-service\" class=\"anchor\" aria-label=\"Permalink: Good manners = more reliable service.\" href=\"#good-manners--more-reliable-service\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBut we prefer carrots to sticks. As of September 18th 2017 any API queries that \u003cstrong\u003euse HTTPS and have appropriate contact information\u003c/strong\u003e will be directed to a special pool of API machines that are reserved for polite users.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhy are we doing this? Well- we don't want to force users to have to register with us. But this means that if some user of the public server writes a buggy script or ignores timeouts and errors- they can really bring the API service to its knees. What's more, it is very hard for us to identify these problem users because they tend to work off multiple parallel machines and use generic User-Agent headers. They are effectively anonymous. We're starting to have to spend a lot of time dealing with these problems and the degraded performance of the public API is affecting all the polite users as well.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSo... we are keeping the public service as is. It will probably continue to fluctuate widely in performance. But now, if a client connects to the API using HTTPS and provides contact information either in their User-Agent header or as a parameter on their queries, then we will send them to a separate pool of machines. We expect to be able to better control the performance of these machines because, if a script starts causing problems, we can contact the people responsible for the script to ask them to fix it. Or, in extremis, we can block it.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHow does it work? Simple. You can do one of two things to get directed to the \"polite pool\":\u003c/p\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003eInclude a \"mailto\" parameter in your query. For example:\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?filter=has-full-text:true\u0026amp;mailto=GroovyBib@example.org\u003c/code\u003e\u003c/p\u003e\n\u003col start=\"2\" dir=\"auto\"\u003e\n\u003cli\u003eInclude a \"mailto:\" in your User-Agent header. For example:\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eGroovyBib/1.1 (https://example.org/GroovyBib/; mailto:GroovyBib@example.org) BasedOnFunkyLib/1.4\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote that this only works if you query the API using HTTPS. You really should be doing that anyway (wags finger).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFrequently anticipated questions\u003c/h5\u003e\u003ca id=\"user-content-frequently-anticipated-questions\" class=\"anchor\" aria-label=\"Permalink: Frequently anticipated questions\" href=\"#frequently-anticipated-questions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eQ:\u003c/strong\u003e Will you spam me with marketing \u003ca href=\"https://en.oxforddictionaries.com/definition/bumf\" rel=\"nofollow\"\u003ebumf\u003c/a\u003e once you have our contact info?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eA:\u003c/strong\u003e No. We will only use it to contact you about problems with your scripts.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eQ:\u003c/strong\u003e Is this a secret plot to kill public access to your API?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eA:\u003c/strong\u003e No. It is an attempt to keep the public API reliable.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eQ:\u003c/strong\u003e What if I provide fake or incorrect contact info?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eA:\u003c/strong\u003e That is not very polite. If there is a problem and you don't respond, we'll block you.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eQ:\u003c/strong\u003e Does the contact info have to be a real name?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eA:\u003c/strong\u003e No. As long as somebody actually receives and pays attention to email at the address, it can be pseudo-anonymous, or whatever.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRate limits\u003c/h4\u003e\u003ca id=\"user-content-rate-limits\" class=\"anchor\" aria-label=\"Permalink: Rate limits\" href=\"#rate-limits\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFrom time to time Crossref needs to impose rate limits to ensure that the free API is usable by all. Any rate limits that are in effect will be advertised in the \u003ccode\u003eX-Rate-Limit-Limit\u003c/code\u003e and \u003ccode\u003eX-Rate-Limit-Interval\u003c/code\u003e HTTP headers.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor ease-of-parsing, the \u003ccode\u003eX-Rate-Limit-Interval\u003c/code\u003e will always be expressed in seconds. So, for example the following tells you that you should expect to be able to perform 50 requests a second:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"X-Rate-Limit-Limit: 50\nX-Rate-Limit-Interval: 1s\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eX-Rate-Limit-Limit: 50\nX-Rate-Limit-Interval: 1s\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that if we wanted to adjust the measurement window, we could specify:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"X-Rate-Limit-Limit: 3000\nX-Rate-Limit-Interval: 60s\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eX-Rate-Limit-Limit: 3000\nX-Rate-Limit-Interval: 60s\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBlocking\u003c/h4\u003e\u003ca id=\"user-content-blocking\" class=\"anchor\" aria-label=\"Permalink: Blocking\" href=\"#blocking\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is always our last resort, and you can generally avoid it if you include contact information in the \u003ccode\u003eUser-Agent\u003c/code\u003e header or \u003ccode\u003emailto\u003c/code\u003e parameter as described above.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBut seriously... this is a bummer. We really want you to use the API. If you are polite about it, you shouldn't have any problems.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUse for production services\u003c/h3\u003e\u003ca id=\"user-content-use-for-production-services\" class=\"anchor\" aria-label=\"Permalink: Use for production services\" href=\"#use-for-production-services\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhat if you want to use our API for a production service that cannot depend on the performance uncertainties of the free and open public API? What if you don't want to be affected by impolite people who do not follow the \u003ca href=\"#api-etiquette\"\u003eAPI Etiquette\u003c/a\u003e guidelines? Well, if you’re interested in using these tools or APIs for production services, we \u003ca href=\"https://www.crossref.org/services/metadata-delivery/plus-service/\" rel=\"nofollow\"\u003ehave a service-level offering\u003c/a\u003e called \"Plus\". This service provides you with access to all supported APIs and metadata, but with extra service and support guarantees.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAuthorization token for Plus service\u003c/h4\u003e\u003ca id=\"user-content-authorization-token-for-plus-service\" class=\"anchor\" aria-label=\"Permalink: Authorization token for Plus service\" href=\"#authorization-token-for-plus-service\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen you sign up for the Plus service, you will be issued an API token that you should put in the \u003ccode\u003eAuthorization\u003c/code\u003e header of all your rest API requests. This token will ensure that said requests get directed to a pool of machines that are reserved for \"Plus\" SLA users. For example, with \u003ca href=\"https://curl.haxx.se/\" rel=\"nofollow\"\u003ecurl\u003c/a\u003e:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"curl -X GET \\\n https://api.crossref.org/works \\\n -H 'Crossref-Plus-API-Token: Bearer yJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJodHRwOi8vY3Jvc3NyZWYub3JnLyIsImF1ZXYZImVuaGFuY2VkY21zIiwianRpIjoiN0M5ODlFNTItMTFEQS00QkY3LUJCRUUtODFCMUM3QzE0OTZEIn0.NYe3-O066sce9R1fjMzNEvP88VqSEaYdBY622FDiG8Uq' \\\n -H 'User-Agent: GroovyBib/1.1 (https://example.org/GroovyBib/; mailto:GroovyBib@example.org) BasedOnFunkyLib/1.4'\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ecurl -X GET \\\n https://api.crossref.org/works \\\n -H 'Crossref-Plus-API-Token: Bearer yJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJodHRwOi8vY3Jvc3NyZWYub3JnLyIsImF1ZXYZImVuaGFuY2VkY21zIiwianRpIjoiN0M5ODlFNTItMTFEQS00QkY3LUJCRUUtODFCMUM3QzE0OTZEIn0.NYe3-O066sce9R1fjMzNEvP88VqSEaYdBY622FDiG8Uq' \\\n -H 'User-Agent: GroovyBib/1.1 (https://example.org/GroovyBib/; mailto:GroovyBib@example.org) BasedOnFunkyLib/1.4'\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that you can still be \"polite\" and identify yourself as well. And, of course, replace the fake token above with the real token.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAPI overview\u003c/h2\u003e\u003ca id=\"user-content-api-overview\" class=\"anchor\" aria-label=\"Permalink: API overview\" href=\"#api-overview\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe API is generally RESTFUL and returns results in JSON. JSON formats returned by the API are documented \u003ca href=\"https://github.com/Crossref/rest-api-doc/blob/master/api_format.md\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe API supports HTTP and HTTPS. Examples here are provided using HTTPS.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eYou should always url-encode DOIs and parameter values when using the API. DOIs are notorious for including characters that break URLs (e.g. semicolons, hashes, slashes, ampersands, question marks, etc.).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote url-encoding applies to cursors as well since they too are likely to include characters that will break URLs (e.g. \u003ccode\u003e+\u003c/code\u003e symbol)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote that, for the sake of clarity, the examples in this document do \u003cem\u003enot\u003c/em\u003e url-encode DOIs or parameter values.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe API will only work for Crossref DOIs. You can test the registration agency for a DOI using the following route:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ehttps://api.crossref.org/works/{doi}/agency\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTesting the following Crossref DOI:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003e10.1037/0003-066X.59.1.29\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eUsing the URL:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ehttps://api.crossref.org/works/10.1037/0003-066X.59.1.29/agency\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWill return the following result:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"{\n status: \u0026quot;ok\u0026quot;,\n message-type: \u0026quot;work-agency\u0026quot;,\n message-version: \u0026quot;1.0.0\u0026quot;,\n message: {\n DOI: \u0026quot;10.1037/0003-066x.59.1.29\u0026quot;,\n agency: {\n id: \u0026quot;crossref\u0026quot;,\n label: \u0026quot;Crossref\u0026quot;\n }\n }\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e{\n status: \"ok\",\n message-type: \"work-agency\",\n message-version: \"1.0.0\",\n message: {\n DOI: \"10.1037/0003-066x.59.1.29\",\n agency: {\n id: \"crossref\",\n label: \"Crossref\"\n }\n }\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you use any of the API calls listed below with a non-Crossref DOI, you will get a \u003ccode\u003e404\u003c/code\u003e HTTP status response. Typical agency IDs include \u003ccode\u003ecrossref\u003c/code\u003e, \u003ccode\u003edatacite\u003c/code\u003e, \u003ccode\u003emedra\u003c/code\u003e and also \u003ccode\u003epublic\u003c/code\u003e for test DOIs.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eResult types\u003c/h2\u003e\u003ca id=\"user-content-result-types\" class=\"anchor\" aria-label=\"Permalink: Result types\" href=\"#result-types\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAll results are returned in JSON. There are three general types of results:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSingletons\u003c/li\u003e\n\u003cli\u003eHeaders-only\u003c/li\u003e\n\u003cli\u003eLists\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe mime-type for API results is \u003ccode\u003eapplication/vnd.crossref-api-message+json\u003c/code\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSingletons\u003c/h3\u003e\u003ca id=\"user-content-singletons\" class=\"anchor\" aria-label=\"Permalink: Singletons\" href=\"#singletons\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSingletons are single results. Retrieving metadata for a specific identifier (e.g. DOI, ISSN, funder_identifier) typically returns in a singleton result.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHeaders only\u003c/h3\u003e\u003ca id=\"user-content-headers-only\" class=\"anchor\" aria-label=\"Permalink: Headers only\" href=\"#headers-only\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can use HTTP HEAD requests to quickly determine \"existence\" of a singleton. The advantage of this technique is that it is very fast because it does not return any metadata- it only returns headers and an HTTP status code (200=exists, 404=does not exist).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo determine if member ID \u003ccode\u003e98\u003c/code\u003e exists:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ecurl --head \"https://api.crossref.org/members/98\"\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo determine if a journal with ISSN \u003ccode\u003e1549-7712\u003c/code\u003e exists:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ecurl --head \"https://api.crossref.org/journals/1549-7712\"\u003c/code\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLists\u003c/h3\u003e\u003ca id=\"user-content-lists\" class=\"anchor\" aria-label=\"Permalink: Lists\" href=\"#lists\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eLists results can contain multiple entries. Searching or filtering typically returns a list result. A list has two parts:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eSummary, which include the following information:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003estatus (e.g. \"ok\", error)\u003c/li\u003e\n\u003cli\u003emessage-type (e.g. \"work-list\" )\u003c/li\u003e\n\u003cli\u003emessage-version (e.g. 1.0.0 )\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eItems, which will will contain the items matching the query or filter.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eNote that the \"message-type\" returned will differ from the mime-type:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003efunder (singleton)\u003c/li\u003e\n\u003cli\u003eprefix (singleton)\u003c/li\u003e\n\u003cli\u003emember (singleton)\u003c/li\u003e\n\u003cli\u003ework (singleton)\u003c/li\u003e\n\u003cli\u003ework-list (list)\u003c/li\u003e\n\u003cli\u003efunder-list (list)\u003c/li\u003e\n\u003cli\u003eprefix-list (list)\u003c/li\u003e\n\u003cli\u003emember-list (list)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eNormally, an API list result will return both the summary and the items. If you want to just retrieve the summary, you can do so by specifying that the number of rows returned should be zero.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSort order\u003c/h4\u003e\u003ca id=\"user-content-sort-order\" class=\"anchor\" aria-label=\"Permalink: Sort order\" href=\"#sort-order\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf the API call includes a query, then the sort order will be by the relevance score. If no query is included, then the sort order will be by DOI update date.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSelecting which elements to return\u003c/h3\u003e\u003ca id=\"user-content-selecting-which-elements-to-return\" class=\"anchor\" aria-label=\"Permalink: Selecting which elements to return\" href=\"#selecting-which-elements-to-return\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCrossref metadata records can be quite large. Sometimes you just want a few elements from the schema. You can \"select\" a subset of elements to return using the \u003ccode\u003eselect\u003c/code\u003e parameter. This can make your API calls much more efficient. For example:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?sample=10\u0026amp;select=DOI,title\u003c/code\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eResource components\u003c/h2\u003e\u003ca id=\"user-content-resource-components\" class=\"anchor\" aria-label=\"Permalink: Resource components\" href=\"#resource-components\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMajor resource components supported by the Crossref API are:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eworks\u003c/li\u003e\n\u003cli\u003efunders\u003c/li\u003e\n\u003cli\u003emembers\u003c/li\u003e\n\u003cli\u003eprefixes\u003c/li\u003e\n\u003cli\u003etypes\u003c/li\u003e\n\u003cli\u003ejournals\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThese can be used alone like this\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth align=\"left\"\u003eresource\u003c/th\u003e\n\u003cth align=\"left\"\u003edescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/works\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns a list of all works (journal articles, conference proceedings, books, components, etc), 20 per page\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/funders\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns a list of all funders in the \u003ca href=\"https://github.com/Crossref/open-funder-registry\"\u003eFunder Registry\u003c/a\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/members\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns a list of all Crossref members (mostly publishers)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/types\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns a list of valid work types\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/licenses\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturn a list of licenses applied to works in Crossref metadata\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/journals\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturn a list of journals in the Crossref database\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eResource components and identifiers\u003c/h3\u003e\u003ca id=\"user-content-resource-components-and-identifiers\" class=\"anchor\" aria-label=\"Permalink: Resource components and identifiers\" href=\"#resource-components-and-identifiers\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eResource components can be used in conjunction with identifiers to retrieve the metadata for that identifier.\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth align=\"left\"\u003eresource\u003c/th\u003e\n\u003cth align=\"left\"\u003edescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/works/{doi}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns metadata for the specified Crossref DOI.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/funders/{funder_id}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns metadata for specified funder \u003cstrong\u003eand\u003c/strong\u003e its suborganizations\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/prefixes/{owner_prefix}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns metadata for the DOI owner prefix\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/members/{member_id}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns metadata for a Crossref member\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/types/{type_id}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns information about a metadata work type\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/journals/{issn}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns information about a journal with the given ISSN\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCombining resource components\u003c/h3\u003e\u003ca id=\"user-content-combining-resource-components\" class=\"anchor\" aria-label=\"Permalink: Combining resource components\" href=\"#combining-resource-components\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe works component can be appended to other resources.\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth align=\"left\"\u003eresource\u003c/th\u003e\n\u003cth align=\"left\"\u003edescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/works/{doi}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns information about the specified Crossref \u003ccode\u003eDOI\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/funders/{funder_id}/works\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns list of works associated with the specified \u003ccode\u003efunder_id\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/types/{type_id}/works\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns list of works of type \u003ccode\u003etype\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/prefixes/{owner_prefix}/works\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns list of works associated with specified \u003ccode\u003eowner_prefix\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/members/{member_id}/works\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns list of works associated with a Crossref member (deposited by a Crossref member)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e/journals/{issn}/works\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturns a list of works in the given journal\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eParameters\u003c/h2\u003e\u003ca id=\"user-content-parameters\" class=\"anchor\" aria-label=\"Permalink: Parameters\" href=\"#parameters\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eParameters can be used to query, filter and control the results returned by the Crossref API. They can be passed as normal URI parameters or as JSON in the body of the request.\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth align=\"left\"\u003eparameter\u003c/th\u003e\n\u003cth align=\"left\"\u003edescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003equery\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003equery terms\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efilter={filter_name}:{value}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003efilter results by specific fields\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003erows={#}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eresults per page\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eoffset={#}\u003c/code\u003e (max 10k)\u003c/td\u003e\n\u003ctd align=\"left\"\u003eresult offset (use \u003ccode\u003ecursor\u003c/code\u003e for larger \u003ccode\u003e/works\u003c/code\u003e result sets)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003esample={#}\u003c/code\u003e (max 100)\u003c/td\u003e\n\u003ctd align=\"left\"\u003ereturn random N results\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003esort={#}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003esort results by a certain field\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eorder={#}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eset the sort order to \u003ccode\u003easc\u003c/code\u003e or \u003ccode\u003edesc\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efacet={#}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eenable facet information in responses\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ecursor={#}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003edeep page through \u003ccode\u003e/works\u003c/code\u003e result sets\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eMultiple filters can be specified by separating name:value pairs with a comma:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?filter=has-orcid:true,from-pub-date:2004-04-04\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?filter=has-orcid:true,from-pub-date:2004-04-04\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample query using URI parameters\u003c/h3\u003e\u003ca id=\"user-content-example-query-using-uri-parameters\" class=\"anchor\" aria-label=\"Permalink: Example query using URI parameters\" href=\"#example-query-using-uri-parameters\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/funders/100000015/works?query=global+state\u0026amp;filter=has-orcid:true\u0026amp;rows=1\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/funders/100000015/works?query=global+state\u0026amp;filter=has-orcid:true\u0026amp;rows=1\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eQueries\u003c/h2\u003e\u003ca id=\"user-content-queries\" class=\"anchor\" aria-label=\"Permalink: Queries\" href=\"#queries\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFree form search queries can be made, for example, works that include \u003ccode\u003erenear\u003c/code\u003e and \u003ccode\u003eontologies\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?query=renear+ontologies\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?query=renear+ontologies\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eField Queries\u003c/h2\u003e\u003ca id=\"user-content-field-queries\" class=\"anchor\" aria-label=\"Permalink: Field Queries\" href=\"#field-queries\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eField queries are available on the \u003ccode\u003e/works\u003c/code\u003e route and allow for queries that match only particular fields\nof metadata. For example, this query matches records that contain the tokens \u003ccode\u003erichard\u003c/code\u003e or \u003ccode\u003efeynman\u003c/code\u003e (or both)\nin any author field:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?query.author=richard+feynman\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?query.author=richard+feynman\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eField queries can be combined with the general \u003ccode\u003equery\u003c/code\u003e parameter and each other. Each query parameter\nis ANDed with the others:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?query.bibliographic=room+at+the+bottom\u0026amp;query.author=richard+feynman\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?query.bibliographic=room+at+the+bottom\u0026amp;query.author=richard+feynman\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003e/works\u003c/code\u003e Field Queries\u003c/h3\u003e\u003ca id=\"user-content-works-field-queries\" class=\"anchor\" aria-label=\"Permalink: /works Field Queries\" href=\"#works-field-queries\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThese field queries are available on the \u003ccode\u003e/works\u003c/code\u003e route:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eField query parameter\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003equery.container-title\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eQuery \u003ccode\u003econtainer-title\u003c/code\u003e aka. publication name\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003equery.author\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eQuery author given and family names\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003equery.editor\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eQuery editor given and family names\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003equery.chair\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eQuery chair given and family names\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003equery.translator\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eQuery translator given and family names\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003equery.contributor\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eQuery author, editor, chair and translator given and family names\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003equery.bibliographic\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eQuery bibliographic information, useful for citation look up. Includes titles, authors, ISSNs and publication years\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003equery.affiliation\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eQuery contributor affiliations\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eNote that \u003ccode\u003equery.title\u003c/code\u003e has been deprecated and is no longer available. Please use \u003ccode\u003equery.bibliographic\u003c/code\u003e instead.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSorting\u003c/h2\u003e\u003ca id=\"user-content-sorting\" class=\"anchor\" aria-label=\"Permalink: Sorting\" href=\"#sorting\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eResults from a listy response can be sorted by applying the \u003ccode\u003esort\u003c/code\u003e and \u003ccode\u003eorder\u003c/code\u003e parameters. Order\nsets the result ordering, either \u003ccode\u003easc\u003c/code\u003e or \u003ccode\u003edesc\u003c/code\u003e. Sort sets the field by which results will be\nsorted. Possible values are:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSort value\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003escore\u003c/code\u003e or \u003ccode\u003erelevance\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by relevance score\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eupdated\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by date of most recent change to metadata. Currently the same as \u003ccode\u003edeposited\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003edeposited\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by time of most recent deposit\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eindexed\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by time of most recent index\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003epublished\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by publication date\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003epublished-print\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by print publication date\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003epublished-online\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by online publication date\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eissued\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by issued date (earliest known publication date)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eis-referenced-by-count\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by number of times this DOI is referenced by other Crossref DOIs\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003ereferences-count\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSort by number of references included in the references section of the document identified by this DOI\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eAn example that sorts results in order of publication, beginning with the least recent:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?query=josiah+carberry\u0026amp;sort=published\u0026amp;order=asc\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?query=josiah+carberry\u0026amp;sort=published\u0026amp;order=asc\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFacet counts\u003c/h2\u003e\u003ca id=\"user-content-facet-counts\" class=\"anchor\" aria-label=\"Permalink: Facet counts\" href=\"#facet-counts\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFacet counts can be retrieved by enabling faceting. Facets are enabled by providing facet field names along with a maximum number of returned term values. The larger the number of returned values, the longer the query will take. Some facet fields\ncan accept a \u003ccode\u003e*\u003c/code\u003e as their maximum, which indicates that all values should be returned.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFacets are specified with the \u003ccode\u003efacet\u003c/code\u003e parameter:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?rows=0\u0026amp;facet=type-name:*\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?rows=0\u0026amp;facet=type-name:*\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth align=\"left\"\u003eFacet name\u003c/th\u003e\n\u003cth align=\"left\"\u003eMaximum values\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eaffiliation\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAuthor affiliation\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efunder-name\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eFunder literal name as deposited alongside DOIs\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efunder-doi\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eFunder DOI\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eorcid\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e100\u003c/td\u003e\n\u003ctd\u003eContributor ORCID\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003econtainer-title\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e100\u003c/td\u003e\n\u003ctd\u003eWork container title, such as journal title, or book title\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eassertion\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eCustom Crossmark assertion name\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003earchive\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eArchive location\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eupdate-type\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eSignificant update type\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eissn\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e100\u003c/td\u003e\n\u003ctd\u003eJournal ISSN (any - print, electronic, link)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003epublished\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eEarliest year of publication\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003etype-name\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eWork type name, such as \u003ccode\u003ejournal-article\u003c/code\u003e or \u003ccode\u003ebook-chapter\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003elicense\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eLicense URI of work\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ecategory-name\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eCategory name of work\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003erelation-type\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eRelation type described by work or described by another work with work as object\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eassertion-group\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eCustom Crossmark assertion group name\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003epublisher-name\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e*\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003ePublisher name of work\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFilter names\u003c/h2\u003e\u003ca id=\"user-content-filter-names\" class=\"anchor\" aria-label=\"Permalink: Filter names\" href=\"#filter-names\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFilters allow you to narrow queries. All filter results are lists.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe following filters are supported for the \u003ccode\u003e/works\u003c/code\u003e route:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth align=\"left\"\u003efilter\u003c/th\u003e\n\u003cth align=\"left\"\u003epossible values\u003c/th\u003e\n\u003cth align=\"left\"\u003edescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-funder\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata which includes one or more funder entry\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efunder\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{funder_id}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata which include the \u003ccode\u003e{funder_id}\u003c/code\u003e in FundRef data\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003elocation\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{country_name}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003efunder records where location = \u003ccode\u003e{country name}\u003c/code\u003e. Only works on \u003ccode\u003e/funders\u003c/code\u003e route\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eprefix\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{owner_prefix}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata belonging to a DOI owner prefix \u003ccode\u003e{owner_prefix}\u003c/code\u003e (e.g. \u003ccode\u003e10.1016\u003c/code\u003e )\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003emember\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{member_id}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata belonging to a Crossref member\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efrom-index-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata indexed since (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003euntil-index-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata indexed before (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efrom-deposit-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata last (re)deposited since (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003euntil-deposit-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata last (re)deposited before (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efrom-update-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eMetadata updated since (inclusive) \u003ccode\u003e{date}\u003c/code\u003e. Currently the same as \u003ccode\u003efrom-deposit-date\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003euntil-update-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eMetadata updated before (inclusive) \u003ccode\u003e{date}\u003c/code\u003e. Currently the same as \u003ccode\u003euntil-deposit-date\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efrom-created-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata first deposited since (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003euntil-created-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata first deposited before (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efrom-pub-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where published date is since (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003euntil-pub-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where published date is before (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efrom-online-pub-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where online published date is since (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003euntil-online-pub-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where online published date is before (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efrom-print-pub-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where print published date is since (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003euntil-print-pub-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where print published date is before (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efrom-posted-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where posted date is since (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003euntil-posted-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where posted date is before (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efrom-accepted-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where accepted date is since (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003euntil-accepted-date\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where accepted date is before (inclusive) \u003ccode\u003e{date}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-license\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata that includes any \u003ccode\u003e\u0026lt;license_ref\u0026gt;\u003c/code\u003e elements.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003elicense.url\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{url}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where \u003ccode\u003e\u0026lt;license_ref\u0026gt;\u003c/code\u003e value equals \u003ccode\u003e{url}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003elicense.version\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{string}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where the \u003ccode\u003e\u0026lt;license_ref\u0026gt;\u003c/code\u003e's \u003ccode\u003eapplies_to\u003c/code\u003e attribute is \u003ccode\u003e{string}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003elicense.delay\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{integer}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where difference between publication date and the \u003ccode\u003e\u0026lt;license_ref\u0026gt;\u003c/code\u003e's \u003ccode\u003estart_date\u003c/code\u003e attribute is \u0026lt;= \u003ccode\u003e{integer}\u003c/code\u003e (in days)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-full-text\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata that includes any full text \u003ccode\u003e\u0026lt;resource\u0026gt;\u003c/code\u003e elements.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efull-text.version\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{string}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where \u003ccode\u003e\u0026lt;resource\u0026gt;\u003c/code\u003e element's \u003ccode\u003econtent_version\u003c/code\u003e attribute is \u003ccode\u003e{string}\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efull-text.type\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{mime_type}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where \u003ccode\u003e\u0026lt;resource\u0026gt;\u003c/code\u003e element's \u003ccode\u003econtent_type\u003c/code\u003e attribute is \u003ccode\u003e{mime_type}\u003c/code\u003e (e.g. \u003ccode\u003eapplication/pdf\u003c/code\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003efull-text.application\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{string}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where \u003ccode\u003e\u0026lt;resource\u0026gt;\u003c/code\u003e link has one of the following intended applications: \u003ccode\u003etext-mining\u003c/code\u003e, \u003ccode\u003esimilarity-checking\u003c/code\u003e or \u003ccode\u003eunspecified\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-references\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for works that have a list of references\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ereference-visibility\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e[open, limited, closed]\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for works where references are either \u003ccode\u003eopen\u003c/code\u003e, \u003ccode\u003elimited\u003c/code\u003e (to \u003ca href=\"https://www.crossref.org/services/metadata-delivery/plus-service/\" rel=\"nofollow\"\u003eMetadata Plus subscribers\u003c/a\u003e) or \u003ccode\u003eclosed\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-archive\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata which include name of archive partner\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003earchive\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{string}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata which where value of archive partner is \u003ccode\u003e{string}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-orcid\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata which includes one or more ORCIDs\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-authenticated-orcid\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata which includes one or more ORCIDs where the depositing publisher claims to have witness the ORCID owner authenticate with ORCID\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eorcid\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{orcid}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where \u003ccode\u003e\u0026lt;orcid\u0026gt;\u003c/code\u003e element's value = \u003ccode\u003e{orcid}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eissn\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{issn}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where record has an ISSN = \u003ccode\u003e{issn}\u003c/code\u003e. Format is \u003ccode\u003exxxx-xxxx\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eisbn\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{isbn}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where record has an ISBN = \u003ccode\u003e{issn}\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003etype\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{type}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata records whose type = \u003ccode\u003e{type}\u003c/code\u003e. Type must be an ID value from the list of types returned by the \u003ccode\u003e/types\u003c/code\u003e resource\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003edirectory\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{directory}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata records whose article or serial are mentioned in the given \u003ccode\u003e{directory}\u003c/code\u003e. Currently the only supported value is \u003ccode\u003edoaj\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003edoi\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{doi}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata describing the DOI \u003ccode\u003e{doi}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eupdates\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{doi}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records that represent editorial updates to the DOI \u003ccode\u003e{doi}\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eis-update\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records that represent editorial updates\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-update-policy\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records that include a link to an editorial update policy\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003econtainer-title\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with a publication title exactly with an exact match\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ecategory-name\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with an exact matching category label. Category labels come from \u003ca href=\"https://www.elsevier.com/solutions/scopus/content\" rel=\"nofollow\"\u003ethis list\u003c/a\u003e published by Scopus\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003etype\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with type matching a type identifier (e.g. \u003ccode\u003ejournal-article\u003c/code\u003e)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003etype-name\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with an exactly matching type label\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eaward.number\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{award_number}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with a matching award nunber. Optionally combine with \u003ccode\u003eaward.funder\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eaward.funder\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e{funder doi or id}\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with an award with matching funder. Optionally combine with \u003ccode\u003eaward.number\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-assertion\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with any assertions\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eassertion-group\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with an assertion in a particular group\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003eassertion\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with a particular named assertion\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-affiliation\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records that have any affiliation information\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ealternative-id\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with the given alternative ID, which may be a publisher-specific ID, or any other identifier a publisher may have provided\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003earticle-number\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records with a given article number\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-abstract\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records which include an abstract\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-clinical-trial-number\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records which include a clinical trial number\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003econtent-domain\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where the publisher records a particular domain name as the location Crossmark content will appear\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-content-domain\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where the publisher records a domain name location for Crossmark content\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-domain-restriction\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata where the publisher restricts Crossmark usage to content domains\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-relation\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003emetadata for records that either assert or are the object of a relation\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003erelation.type\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eOne of the relation types from the Crossref relations schema (e.g. \u003ccode\u003eis-referenced-by\u003c/code\u003e, \u003ccode\u003eis-parent-of\u003c/code\u003e, \u003ccode\u003eis-preprint-of\u003c/code\u003e)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003erelation.object\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eRelations where the object identifier matches the identifier provided\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003erelation.object-type\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eOne of the identifier types from the Crossref relations schema (e.g. \u003ccode\u003edoi\u003c/code\u003e, \u003ccode\u003eissn\u003c/code\u003e)\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eThe following filters are supported for the \u003ccode\u003e/members\u003c/code\u003e route:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth align=\"left\"\u003efilter\u003c/th\u003e\n\u003cth align=\"left\"\u003epossible values\u003c/th\u003e\n\u003cth align=\"left\"\u003edescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ehas-public-references\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eMember has made their references public for one or more of their prefixes\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ereference-visibility\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003e[open, limited, closed]\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003eMembers who have made their references either \u003ccode\u003eopen\u003c/code\u003e, \u003ccode\u003elimited\u003c/code\u003e (to \u003ca href=\"https://www.crossref.org/services/metadata-delivery/plus-service/\" rel=\"nofollow\"\u003eMetadata Plus subscribers\u003c/a\u003e) or \u003ccode\u003eclosed\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ebackfile-doi-count\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e{integer}\u003c/td\u003e\n\u003ctd align=\"left\"\u003ecount of DOIs for material published more than two years ago\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003ecurrent-doi-count\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e{integer}\u003c/td\u003e\n\u003ctd align=\"left\"\u003ecount of DOIs for material published within last two years\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eThe following filters are supported for the \u003ccode\u003e/funders\u003c/code\u003e route:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth align=\"left\"\u003efilter\u003c/th\u003e\n\u003cth align=\"left\"\u003epossible values\u003c/th\u003e\n\u003cth align=\"left\"\u003edescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003ccode\u003elocation\u003c/code\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003e\u003c/td\u003e\n\u003ctd align=\"left\"\u003efunders located in specified country\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMultiple filters\u003c/h3\u003e\u003ca id=\"user-content-multiple-filters\" class=\"anchor\" aria-label=\"Permalink: Multiple filters\" href=\"#multiple-filters\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMultiple filters can be specified in a single query. In such a case, different filters will be applied with AND semantics, while specifying the same filter multiple times will result in OR semantics - that is, specifying the filters:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eis-update:true\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003efrom-pub-date:2014-03-03\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003efunder:10.13039/100000001\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003efunder:10.13039/100000050\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003ewould locate documents that are updates, were published on or after 3rd March 2014 and were funded by either the National Science Foundation (\u003ccode\u003e10.13039/100000001\u003c/code\u003e) or the National Heart, Lung, and Blood Institute (\u003ccode\u003e10.13039/100000050\u003c/code\u003e). These filters would be specified by joining each filter together with a comma:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"/works?filter=is-update:true,from-pub-date:2014-03-03,funder:10.13039/100000001,funder:10.13039/100000050\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e/works?filter=is-update:true,from-pub-date:2014-03-03,funder:10.13039/100000001,funder:10.13039/100000050\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDot filters\u003c/h3\u003e\u003ca id=\"user-content-dot-filters\" class=\"anchor\" aria-label=\"Permalink: Dot filters\" href=\"#dot-filters\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA filter with a dot in its name is special. The dot signifies that the filter will be applied to some other record type that is related to primary resource record type. For example, with work queries, one can filter on works that have an award, where the same award has a particular award number and award-giving funding agency:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"/works?filter=award.number:CBET-0756451,award.funder:10.13039/100000001\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e/works?filter=award.number:CBET-0756451,award.funder:10.13039/100000001\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHere we filter on works that have an award by the National Science Foundation that also has the award number \u003ccode\u003eCBET-0756451\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNotes on owner prefixes\u003c/h3\u003e\u003ca id=\"user-content-notes-on-owner-prefixes\" class=\"anchor\" aria-label=\"Permalink: Notes on owner prefixes\" href=\"#notes-on-owner-prefixes\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe prefix of a Crossref DOI does \u003cstrong\u003eNOT\u003c/strong\u003e indicate who currently owns the DOI. It only reflects who originally registered the DOI. Crossref metadata has an \u003cstrong\u003eowner_prefix\u003c/strong\u003e element that records the current owner of the Crossref DOI in question.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCrossref also has member IDs for depositing organisations. A single member may control multiple owner prefixes, which in turn may control a number of DOIs. When looking at works published by a certain organisation, member IDs and the member routes should be used.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNotes on dates\u003c/h3\u003e\u003ca id=\"user-content-notes-on-dates\" class=\"anchor\" aria-label=\"Permalink: Notes on dates\" href=\"#notes-on-dates\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that dates in filters should always be of the form \u003ccode\u003eYYYY-MM-DD\u003c/code\u003e, \u003ccode\u003eYYYY-MM\u003c/code\u003e or \u003ccode\u003eYYYY\u003c/code\u003e. Also note that date information in Crossref metadata can often be incomplete. So, for example, a publisher may only include the year and month of publication for a journal article. For a monograph they might just include the year. In these cases the API selects the earliest possible date given the information provided. So, for instance, if the publisher only provided 2013-02 as the published date, then the date would be treated as 2013-02-01. Similarly, if the publisher only provided the year 2013 as the date, it would be treated at 2013-01-01.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNotes on incremental metadata updates\u003c/h3\u003e\u003ca id=\"user-content-notes-on-incremental-metadata-updates\" class=\"anchor\" aria-label=\"Permalink: Notes on incremental metadata updates\" href=\"#notes-on-incremental-metadata-updates\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen using time filters to retrieve periodic, incremental metadata updates,\nthe \u003ccode\u003efrom-index-date\u003c/code\u003e filter should be used over \u003ccode\u003efrom-update-date\u003c/code\u003e,\n\u003ccode\u003efrom-deposit-date\u003c/code\u003e, \u003ccode\u003efrom-created-date\u003c/code\u003e and \u003ccode\u003efrom-pub-date\u003c/code\u003e. The\ntimestamp that \u003ccode\u003efrom-index-date\u003c/code\u003e filters on is guaranteed to be updated\nevery time there is a change to metadata requiring a reindex.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eResult controls\u003c/h2\u003e\u003ca id=\"user-content-result-controls\" class=\"anchor\" aria-label=\"Permalink: Result controls\" href=\"#result-controls\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can control the delivery and selection results using the \u003ccode\u003erows\u003c/code\u003e, \u003ccode\u003eoffset\u003c/code\u003e and \u003ccode\u003esample\u003c/code\u003e parameters.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you are expecting results beyond 10K, then use a \u003ccode\u003ecursor\u003c/code\u003e to deep page through the results. Note that not all routes support cursors.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRows\u003c/h3\u003e\u003ca id=\"user-content-rows\" class=\"anchor\" aria-label=\"Permalink: Rows\" href=\"#rows\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNormally, results are returned 20 at a time. You can control the number of results returns by using the \u003ccode\u003erows\u003c/code\u003e parameter. To limit results to 5, for example, you could do the following:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?query=allen+renear\u0026amp;rows=5\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?query=allen+renear\u0026amp;rows=5\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you would just like to get the \u003ccode\u003esummary\u003c/code\u003e of the results, you can set the rows to 0 (zero).\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?query=allen+renear\u0026amp;rows=0\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?query=allen+renear\u0026amp;rows=0\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe maximum number rows you can ask for in one query is \u003ccode\u003e1000\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOffset\u003c/h3\u003e\u003ca id=\"user-content-offset\" class=\"anchor\" aria-label=\"Permalink: Offset\" href=\"#offset\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe number of returned items is controlled by the \u003ccode\u003erows\u003c/code\u003e parameter, but you can select the offset into the result list by using the \u003ccode\u003eoffset\u003c/code\u003e parameter. So, for example, to select the second set of 5 results (i.e. results 6 through 10), you would do the following:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?query=allen+renear\u0026amp;rows=5\u0026amp;offset=5\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?query=allen+renear\u0026amp;rows=5\u0026amp;offset=5\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOffsets for \u003ccode\u003e/works\u003c/code\u003e are limited to 10K. Use \u003ccode\u003ecursor\u003c/code\u003e (see below) for larger \u003ccode\u003e/works\u003c/code\u003e results sets.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDeep paging with cursors\u003c/h3\u003e\u003ca id=\"user-content-deep-paging-with-cursors\" class=\"anchor\" aria-label=\"Permalink: Deep paging with cursors\" href=\"#deep-paging-with-cursors\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eUsing large \u003ccode\u003eoffset\u003c/code\u003e values can result in extremely long response times. Offsets in the 100,000s and beyond will likely cause a timeout before the API is able to respond. An alternative to paging through very large result sets (like a corpus used for text and data mining) is to use the API's exposure of Solr's deep paging cursors. Any combination of query, filters and facets may be used with deep paging cursors. While \u003ccode\u003erows\u003c/code\u003e may be specified along with \u003ccode\u003ecursor\u003c/code\u003e, \u003ccode\u003eoffset\u003c/code\u003e and \u003ccode\u003esample\u003c/code\u003e cannot be used. To use deep paging make a query as normal, but include the \u003ccode\u003ecursor\u003c/code\u003e parameter with a value of \u003ccode\u003e*\u003c/code\u003e. In this example we will page through all \u003ccode\u003ejournal-article\u003c/code\u003e works from member \u003ccode\u003e311\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/members/311/works?filter=type:journal-article\u0026amp;cursor=*\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/members/311/works?filter=type:journal-article\u0026amp;cursor=*\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA \u003ccode\u003enext-cursor\u003c/code\u003e field will be provided in the JSON response. To get the next page of results, pass the value of \u003ccode\u003enext-cursor\u003c/code\u003e as the \u003ccode\u003ecursor\u003c/code\u003e parameter. For example:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/members/311/works?filter=type:journal-article\u0026amp;cursor=AoE/CGh0dHA6Ly9keC5kb2kub3JnLzEwLjEwMDIvdGRtX2xpY2Vuc2VfMQ==\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/members/311/works?filter=type:journal-article\u0026amp;cursor=AoE/CGh0dHA6Ly9keC5kb2kub3JnLzEwLjEwMDIvdGRtX2xpY2Vuc2VfMQ==\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that the actual cursor value will be different from this illustration.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eClients should check the number of returned items. If the number of returned items is fewer than the number of expected rows then the end of the result set has been reached. Using \u003ccode\u003enext-cursor\u003c/code\u003e beyond this point will result in responses with an empty items list.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003ecursor\u003c/code\u003e parameter is available on all \u003ccode\u003e/works\u003c/code\u003e resources.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSample\u003c/h3\u003e\u003ca id=\"user-content-sample\" class=\"anchor\" aria-label=\"Permalink: Sample\" href=\"#sample\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBeing able to select random results is useful for both testing and sampling. You can use the \u003ccode\u003esample\u003c/code\u003e parameter to retrieve random results. So, for example, the following select 10 random works:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?sample=10\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?sample=10\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that when you use the \u003ccode\u003esample\u003c/code\u003e parameter, the \u003ccode\u003erows\u003c/code\u003e and \u003ccode\u003eoffset\u003c/code\u003e parameters are ignored.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample queries\u003c/h3\u003e\u003ca id=\"user-content-example-queries\" class=\"anchor\" aria-label=\"Permalink: Example queries\" href=\"#example-queries\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAll works published by owner prefix \u003ccode\u003e10.1016\u003c/code\u003e in January 2010\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/prefixes/10.1016/works?filter=from-pub-date:2010-01,until-pub-date:2010-01\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/prefixes/10.1016/works?filter=from-pub-date:2010-01,until-pub-date:2010-01\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAll works funded by \u003ccode\u003e10.13039/100000001\u003c/code\u003e that have a CC-BY license\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/funders/10.13039/100000001/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/funders/10.13039/100000001/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAll works published by owner prefix 10.6064 from February 2010 to February 2013 that have a CC-BY license\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/prefixes/10.6064/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/,from-pub-date:2010-02,until-pub-date:2013-02\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/prefixes/10.6064/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/,from-pub-date:2010-02,until-pub-date:2013-02\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAll works funded by \u003ccode\u003e10.13039/100000015\u003c/code\u003e where license = CC-BY and embargo \u0026lt;= 365 days\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/funders/10.13039/100000015/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/,license.delay:365\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/funders/10.13039/100000015/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/,license.delay:365\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that the filters for license URL and maximum license embargo period (license.url and license.delay) combine to filter each document's metadata for a license with both of these properties.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAll works where the archive partner listed = 'CLOCKSS'\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?filter=archive:CLOCKSS\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?filter=archive:CLOCKSS\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAll members with \u003ccode\u003ehind\u003c/code\u003e in their name (e.g. Hindawi)\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/members?query=hind\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/members?query=hind\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAll licenses linked to works published by Elsevier\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/v1/works?facet=license:*\u0026amp;filter=member:78\u0026amp;rows=0\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/v1/works?facet=license:*\u0026amp;filter=member:78\u0026amp;rows=0\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAll licenses applied to works published in the journal \u003ccode\u003ePathology Research International\u003c/code\u003e\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?facet=license:*\u0026amp;filter=issn:2090-8091\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?facet=license:*\u0026amp;filter=issn:2090-8091\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAll works with an award numbered roughly \u003ccode\u003e1 F31 MH11745\u003c/code\u003e also awarded by funder with ID \u003ccode\u003e10.13039/100000025\u003c/code\u003e\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/works?filter=award.number:1F31MH11745,award.funder:10.13039/100000025\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/works?filter=award.number:1F31MH11745,award.funder:10.13039/100000025\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eThe number of DOIs that have references AND where references are \u003ccode\u003eopen\u003c/code\u003e faceted by publisher name\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/v1.0/works?filter=has-references:true,reference-visibility:open\u0026amp;facet=publisher-name:*\u0026amp;rows=0\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/v1.0/works?filter=has-references:true,reference-visibility:open\u0026amp;facet=publisher-name:*\u0026amp;rows=0\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAPI versioning\u003c/h2\u003e\u003ca id=\"user-content-api-versioning\" class=\"anchor\" aria-label=\"Permalink: API versioning\" href=\"#api-versioning\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn theory, the syntax of the API can vary independently of the result representations. In practice, major version changes in either will require changes to API clients and so versioning of the API will apply to both the API syntax and the result representation.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe API uses a semantic versioning scheme whereby the version number is divided into three parts delimited by periods. The first number represents the \"major\" release number. The second represents a \"minor\" release number.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"Version 1.20\n ^ ^\n | |\n major |\n minor\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eVersion 1.20\n ^ ^\n | |\n major |\n minor\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eMajor\u003c/strong\u003e version increments are defined as releases that can break backwards compatibility. Crossref will only commit to supporting the latest two major releases simultaneously and legacy major releases will be supported for no more than nine months. Exceptions to these rules may be made when major releases are required to ensure the security or stability of the system.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eMinor\u003c/strong\u003e version increments are defined as backwards compatible. There is no limit on the number of minor versions that Crossref can roll out. Note that client applications should not have dependencies on minor versions, and Crossref will only maintain the latest minor version for the two most recent major versions.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAdding syntax options or metadata to representations will normally be backwards compatible and will thus normally only trigger minor version changes. Renaming or restructuring syntax options of metadata tends not to be backward compatible and will thus typically trigger major version changes\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow to manage API versions\u003c/h3\u003e\u003ca id=\"user-content-how-to-manage-api-versions\" class=\"anchor\" aria-label=\"Permalink: How to manage API versions\" href=\"#how-to-manage-api-versions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you need to tie your implementation to a specific major version of the API, you can do so by using version-specific routes. The default route redirects to the most recent version of the API. Some older major versions may be available using a version prefix. For example, to access version \u003ccode\u003ev1\u003c/code\u003e of the API:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"https://api.crossref.org/v1/works\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ehttps://api.crossref.org/v1/works\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eEach major version has no backwards incompatible changes within its public interface.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDocumentation history\u003c/h2\u003e\u003ca id=\"user-content-documentation-history\" class=\"anchor\" aria-label=\"Permalink: Documentation history\" href=\"#documentation-history\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eV1: 2013-09-08, first draft.\u003c/li\u003e\n\u003cli\u003eV2: 2013-09-24, reference platform deployed\u003c/li\u003e\n\u003cli\u003ev3: 2013-09-25, reworked filters. Added API versioning doc\u003c/li\u003e\n\u003cli\u003ev4: 2013-09-25, more filter changes.\u003c/li\u003e\n\u003cli\u003ev5: 2013-09-27, doc mime-type and message-type relationship\u003c/li\u003e\n\u003cli\u003ev6: 2013-10-01, updated \u003ccode\u003esample\u003c/code\u003e \u0026amp; added examples with filters\u003c/li\u003e\n\u003cli\u003ev6: 2013-10-01, corrected warning date\u003c/li\u003e\n\u003cli\u003ev7: 2013-10-02, fixed typos\u003c/li\u003e\n\u003cli\u003ev8: 2013-10-17, updated warning. Added email address\u003c/li\u003e\n\u003cli\u003ev9: 2013-12-13, update example urls\u003c/li\u003e\n\u003cli\u003ev10: 2013-12-13, /types routes, type filter, issn filter\u003c/li\u003e\n\u003cli\u003ev11: 2013-12-14, indexed timestamps, has-archive and archive implemented\u003c/li\u003e\n\u003cli\u003ev12: 2014-01-06, directory filter\u003c/li\u003e\n\u003cli\u003ev13: 2014-02-10, new \u003ccode\u003e/members\u003c/code\u003e, \u003ccode\u003e/publishers\u003c/code\u003e becomes \u003ccode\u003e/prefixes\u003c/code\u003e, new \u003ccode\u003emember\u003c/code\u003e filter, \u003ccode\u003epublisher\u003c/code\u003e filter becomes \u003ccode\u003eprefix\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ev14: 2014-02-14, new \u003ccode\u003ehas-funder\u003c/code\u003e filter.\u003c/li\u003e\n\u003cli\u003ev15: 2014-02-27, new \u003ccode\u003e/licenses\u003c/code\u003e route\u003c/li\u003e\n\u003cli\u003ev16: 2014-05-19, new \u003ccode\u003e/journals\u003c/code\u003e route, new CrossMark (updates and update policy) filters, new \u003ccode\u003esort\u003c/code\u003e and \u003ccode\u003eorder\u003c/code\u003e parameters\u003c/li\u003e\n\u003cli\u003ev17: 2014-05-19, new \u003ccode\u003efacet\u003c/code\u003e query parameter\u003c/li\u003e\n\u003cli\u003ev18: 2014-05-29, new \u003ccode\u003e/works/{doi}/agency\u003c/code\u003e route\u003c/li\u003e\n\u003cli\u003ev19: 2014-06-23, new textual filters - \u003ccode\u003econtainer-title\u003c/code\u003e, \u003ccode\u003ecategory-name\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003ev20: 2014-06-24, OR filter queries, \u003ccode\u003etype-name\u003c/code\u003e filter.\u003c/li\u003e\n\u003cli\u003ev21: 2014-07-01, new \u003ccode\u003eaward.number\u003c/code\u003e and \u003ccode\u003eaward.funder\u003c/code\u003e relational filters.\u003c/li\u003e\n\u003cli\u003ev22: 2014-07-16, changed title to more accurately reflect scope of API.\u003c/li\u003e\n\u003cli\u003ev23, 2014-09-01, semantics of mutliple filters, dot filters\u003c/li\u003e\n\u003cli\u003ev24, 2014-10-15, added info on license of Crossref metadata itself. Doh.\u003c/li\u003e\n\u003cli\u003ev25, 2015-05-06, added link to issue tracker. Removed Warning section.\u003c/li\u003e\n\u003cli\u003ev26, 2015-10-20, added new filters - \u003ccode\u003efrom-created-date\u003c/code\u003e, \u003ccode\u003euntil-created-date\u003c/code\u003e, \u003ccode\u003eaffiliation\u003c/code\u003e, \u003ccode\u003ehas-affiliation\u003c/code\u003e, \u003ccode\u003eassertion-group\u003c/code\u003e, \u003ccode\u003eassertion\u003c/code\u003e, \u003ccode\u003earticle-number\u003c/code\u003e, \u003ccode\u003ealternative-id\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ev27, 2015-10-30, added \u003ccode\u003ecursor\u003c/code\u003e parameter to \u003ccode\u003e/works\u003c/code\u003e resources\u003c/li\u003e\n\u003cli\u003ev28, 2016-05-09, added link to source of category lables\u003c/li\u003e\n\u003cli\u003ev29, 2016-05-24, added field queries\u003c/li\u003e\n\u003cli\u003ev30, 2016-09-26, highlight issue tracker\u003c/li\u003e\n\u003cli\u003ev31, 2016-10-05, document \u003ccode\u003ehas-clinical-trial-number\u003c/code\u003e and \u003ccode\u003ehas-abstract\u003c/code\u003e filters\u003c/li\u003e\n\u003cli\u003ev32, 2016-10-27, document rate limit headers\u003c/li\u003e\n\u003cli\u003ev33, 2016-11-07, guidance on when to use \u003ccode\u003eoffset\u003c/code\u003e vs \u003ccode\u003ecursor\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ev34, 2017-04-26, document support for HTTPS. Update examples to use HTTPS.\u003c/li\u003e\n\u003cli\u003ev35, 2017-04-26, document use of head reqeusts to determine \u003ccode\u003eexistence\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ev36, 2017-04-27, fixed license route examples to use facet/filter instead\u003c/li\u003e\n\u003cli\u003ev37, 2017-04-27, \u003ccode\u003equery.bibliographic\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ev38, 2017-04-27, add v1.1 filters and sort fields\u003c/li\u003e\n\u003cli\u003ev39, 2017-04-27, remove mention of dismax\u003c/li\u003e\n\u003cli\u003ev40, 2017-04-27, clarify faceting feature\u003c/li\u003e\n\u003cli\u003ev41, 2017-04-28, document \u003ccode\u003esample\u003c/code\u003e max = 100, clarify cursors only work on some routes\u003c/li\u003e\n\u003cli\u003ev42, 2017-04-28, life, the universe, and everything\u003c/li\u003e\n\u003cli\u003ev43, 2017-04-28, reminder on the wisdom of url-encoding\u003c/li\u003e\n\u003cli\u003ev44, 2017-04-28, clarify that field queries apply to \u003ccode\u003e/works\u003c/code\u003e route\u003c/li\u003e\n\u003cli\u003ev45, 2017-04-28, document \u003ccode\u003elocation\u003c/code\u003e filter for \u003ccode\u003e/funders\u003c/code\u003e route\u003c/li\u003e\n\u003cli\u003ev46, 2017-06-14, minor text changes and new funder registry link\u003c/li\u003e\n\u003cli\u003ev47, 2017-07-04, clarify \u003ccode\u003equery.affiliation\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ev48, 2017-07-13, correct \"first and given\" names to \"given and family\"\u003c/li\u003e\n\u003cli\u003ev49, 2017-07-20, move document version history, add section on libraries\u003c/li\u003e\n\u003cli\u003ev50, 2017-07-20, add TOC, move document history, add etiquet section, add production use section, general formatting + cleanup\u003c/li\u003e\n\u003cli\u003ev51, 2017-07-24, clarified license of the documentation (as opposed to metadata)\u003c/li\u003e\n\u003cli\u003ev52, 2017-07-27, removed service notice and what's new section.\u003c/li\u003e\n\u003cli\u003ev53, 2017-08-11, mention \u003ccode\u003efull-text.application\u003c/code\u003e filter\u003c/li\u003e\n\u003cli\u003ev54, 2017-09-18, add info about new \"polite pool\"\u003c/li\u003e\n\u003cli\u003ev55, 2017-09-21, document \u003ccode\u003e/member\u003c/code\u003e and \u003ccode\u003e/funder\u003c/code\u003e filters. document \u003ccode\u003epublisher-name\u003c/code\u003e facet. document \u003ccode\u003eselect\u003c/code\u003e parameter.\u003c/li\u003e\n\u003cli\u003ev56, 2018-01-26, add info on frequency of indexing\u003c/li\u003e\n\u003cli\u003ev57, 2018-02-01, document ISBN filter\u003c/li\u003e\n\u003cli\u003ev58, 2018-02-13, document \u003ccode\u003ereference-visibility\u003c/code\u003e filter for \u003ccode\u003e/works\u003c/code\u003e and \u003ccode\u003e/members\u003c/code\u003e routes\u003c/li\u003e\n\u003cli\u003ev59, 2018-02-13, added info about Mtedata Plus service. Corrected spelling. Added example of using \u003ccode\u003ereference-visibility\u003c/code\u003e filter.\u003c/li\u003e\n\u003cli\u003ev60, 2018-02-22, added info for \"Plus\" users on use of token in \u003ccode\u003eAuthorization\u003c/code\u003e header.\u003c/li\u003e\n\u003cli\u003ev61, 2018-02-26, add curl example for use of token.\u003c/li\u003e\n\u003cli\u003ev62, 2018-06-18, clarify how to parse \u003ccode\u003eX-Rate-Limit-Limit-Interval\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ev63, 2018-08-16, remove mistakenly listed \u003ccode\u003eyear\u003c/code\u003e facet. \u003ccode\u003epublished\u003c/code\u003e is correct facet name.\u003c/li\u003e\n\u003cli\u003ev64, 2018-09-04, add text and link to status page.\u003c/li\u003e\n\u003cli\u003ev65, 2019-07-17, updated Plus token name to new recommendation\u003c/li\u003e\n\u003cli\u003ev66, 2019-10-16, deprecated query.title for query.bibliographic\u003c/li\u003e\n\u003cli\u003ev67, 2020-04-28, clarify that url-encoding should be applied to all parameters including cursors.\u003c/li\u003e\n\u003cli\u003ev68, 2021-02-22, Added link to Pitaya Julia library\u003c/li\u003e\n\u003cli\u003ev69, 2021-04-30, Update preamble with reading advise\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Crossref REST API","anchor":"crossref-rest-api","htmlText":"Crossref REST API"},{"level":1,"text":"DEPRECATION NOTICE","anchor":"deprecation-notice","htmlText":"DEPRECATION NOTICE"},{"level":2,"text":"Preamble","anchor":"preamble","htmlText":"Preamble"},{"level":2,"text":"Meta","anchor":"meta","htmlText":"Meta"},{"level":3,"text":"Frequency of indexing","anchor":"frequency-of-indexing","htmlText":"Frequency of indexing"},{"level":3,"text":"Learning about performance or availability problems","anchor":"learning-about-performance-or-availability-problems","htmlText":"Learning about performance or availability problems"},{"level":3,"text":"Reporting 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class="heading-element" dir="auto">Crossref REST API</h1><a id="user-content-crossref-rest-api" class="anchor" aria-label="Permalink: Crossref REST API" href="#crossref-rest-api"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">DEPRECATION NOTICE</h1><a id="user-content-deprecation-notice" class="anchor" aria-label="Permalink: DEPRECATION NOTICE" href="#deprecation-notice"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The Crossref REST API has been updated to use Elasticsearch instead of Solr -- read more about that project <a href="https://www.crossref.org/blog/behind-the-scenes-improvements-to-the-rest-api/" rel="nofollow">here</a>.</p> <p dir="auto">This documentation is <strong>deprecated</strong>. Documentation for the new API can still be found at <a href="https://api.crossref.org/" rel="nofollow">https://api.crossref.org/</a>, and issues should be reported to us via the <a href="https://community.crossref.org/" rel="nofollow">community forum</a> or <a href="mailto:support@crossref.org">support@crossref.org</a>.</p> <ul dir="auto"> <li><a href="#crossref-rest-api">Crossref REST API</a> <ul dir="auto"> <li><a href="#preamble">Preamble</a></li> <li><a href="#meta">Meta</a></li> <li><a href="#api-overview">API overview</a></li> <li><a href="#result-types">Result types</a></li> <li><a href="#resource-components">Resource components</a></li> <li><a href="#parameters">Parameters</a></li> <li><a href="#queries">Queries</a></li> <li><a href="#field-queries">Field Queries</a></li> <li><a href="#sorting">Sorting</a></li> <li><a href="#facet-counts">Facet counts</a></li> <li><a href="#filter-names">Filter names</a></li> <li><a href="#result-controls">Result controls</a></li> <li><a href="#api-versioning">API versioning</a></li> <li><a href="#documentation-history">Documentation history</a></li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Preamble</h2><a id="user-content-preamble" class="anchor" aria-label="Permalink: Preamble" href="#preamble"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The Crossref REST API is one of <a href="https://www.crossref.org/services/metadata-delivery/" rel="nofollow">a variety of tools and APIs</a> that allow anybody to search and reuse our members' metadata in sophisticated ways.</p> <p dir="auto">If you read nothing else, please at least look at the <a href="https://github.com/CrossRef/rest-api-doc/blob/master/api_tips.md">API TIPs</a> document and the <a href="https://github.com/CrossRef/rest-api-doc#etiquette">"Etiquette" section</a> of this document. It will save you (and us) much heartburn.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Meta</h2><a id="user-content-meta" class="anchor" aria-label="Permalink: Meta" href="#meta"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Frequency of indexing</h3><a id="user-content-frequency-of-indexing" class="anchor" aria-label="Permalink: Frequency of indexing" href="#frequency-of-indexing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Records typically appear in the REST API within 20 minutes of their having been successfully deposited with Crossref.</p> <p dir="auto">Summary information (e.g. counts, etc.) are processed in batch every 24 hours.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Learning about performance or availability problems</h3><a id="user-content-learning-about-performance-or-availability-problems" class="anchor" aria-label="Permalink: Learning about performance or availability problems" href="#learning-about-performance-or-availability-problems"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">We record and report service issues on our <a href="https://status.crossref.org" rel="nofollow">status page</a>.</p> <p dir="auto">You might want to check this to see if we are already aware of a problem before you report it.</p> <p dir="auto">We also post notice of any ongoing performance problems with our services on our twitter feeds at <a href="https://twitter.com/CrossrefOrg" rel="nofollow">CrossrefOrg</a> and <a href="https://twitter.com/@CrossrefSupport" rel="nofollow">CrossrefSupport</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Reporting performance or availability problems</h3><a id="user-content-reporting-performance-or-availability-problems" class="anchor" aria-label="Permalink: Reporting performance or availability problems" href="#reporting-performance-or-availability-problems"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Report performance/availability at our <a href="https://support.crossref.org/hc/en-us" rel="nofollow">support site</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Reporting bugs, requesting features</h3><a id="user-content-reporting-bugs-requesting-features" class="anchor" aria-label="Permalink: Reporting bugs, requesting features" href="#reporting-bugs-requesting-features"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Please report bugs with the API or the documentation on our <a href="https://gitlab.com/crossref/issues" rel="nofollow">issue tracker</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Documentation License</h3><a id="user-content-documentation-license" class="anchor" aria-label="Permalink: Documentation License" href="#documentation-license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://creativecommons.org/licenses/by/4.0/" rel="nofollow"><img alt="Creative Commons License" src="https://camo.githubusercontent.com/378f603d990dc28fffb37a14fda1a9242bc7828411ffad53782feaf21c65e51c/68747470733a2f2f692e6372656174697665636f6d6d6f6e732e6f72672f6c2f62792f342e302f38387833312e706e67" data-canonical-src="https://i.creativecommons.org/l/by/4.0/88x31.png" style="max-width: 100%;"></a><br>This work is licensed under a <a href="https://creativecommons.org/licenses/by/4.0/" rel="nofollow">Creative Commons Attribution 4.0 International License</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Metadata License</h3><a id="user-content-metadata-license" class="anchor" aria-label="Permalink: Metadata License" href="#metadata-license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Crossref asserts no claims of ownership to individual items of bibliographic metadata and associated Digital Object Identifiers (DOIs) acquired through the use of the Crossref Free Services. Individual items of bibliographic metadata and associated DOIs may be cached and incorporated into the user's content and systems.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Privacy</h3><a id="user-content-privacy" class="anchor" aria-label="Permalink: Privacy" href="#privacy"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">We also have a <a href="https://www.crossref.org/privacy/" rel="nofollow">privacy policy</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Libraries</h3><a id="user-content-libraries" class="anchor" aria-label="Permalink: Libraries" href="#libraries"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">You might be able to avoid reading all this documentation if you instead use one of the several excellent libraries that have been written for the Crossref REST API. For example:</p> <ul dir="auto"> <li><a href="https://gitlab.com/crossref/crossref_commons_py" rel="nofollow">crossref-commons</a> (Python, developed by Crossref)</li> <li><a href="https://github.com/sckott/habanero">habanero</a> (Python)</li> <li><a href="https://github.com/sckott/serrano">serrano</a> (Ruby)</li> <li><a href="https://github.com/ropensci/rcrossref">rcrossref</a> (R)</li> <li><a href="https://github.com/fabiobatalha/crossrefapi">crossrefapi</a> (Python)</li> <li><a href="https://github.com/MattsSe/crossref-rs">crossref-rs</a> (rust)</li> <li><a href="https://github.com/naustica/Pitaya">pitaya</a> (Julia)</li> </ul> <p dir="auto">If you know of another library you would like to see listed here, please let us know about it via the <a href="https://gitlab.com/crossref/issues" rel="nofollow">issue tracker</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Etiquette</h3><a id="user-content-etiquette" class="anchor" aria-label="Permalink: Etiquette" href="#etiquette"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">We want to provide a public, open, and free API for all. And we don't want to unnecessarily burden developers (or ourselves) with cumbersome API tokens or registration processes in order to use the public REST API. For that to work, we ask that you be polite and try not to do anything that will take the public REST API down or otherwise make it unusable for others. Specifically, we encourage the following polite behaviour:</p> <ul dir="auto"> <li>Cache data so you don't request the same data over and over again.</li> <li>Actively monitor API response times. If they start to go up, back-off for a while. For example, add pauses between requests and/or reduce the number of parallel requests.</li> <li>Specify a <code>User-Agent</code> header that properly identifies your script or tool and that provides a means of contacting you via email using "mailto:". For example: <code>GroovyBib/1.1 (https://example.org/GroovyBib/; mailto:GroovyBib@example.org) BasedOnFunkyLib/1.4</code>.</li> </ul> <p dir="auto">This way we can contact you if we see a problem.</p> <ul dir="auto"> <li>report problems and/or ask questions on our <a href="https://gitlab.com/crossref/issues" rel="nofollow">issue tracker</a>.</li> </ul> <p dir="auto">Alas, not all people are polite. And for this reason we reserve the right to impose rate limits and/or to block clients that are disrupting the public service.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Good manners = more reliable service.</h3><a id="user-content-good-manners--more-reliable-service" class="anchor" aria-label="Permalink: Good manners = more reliable service." href="#good-manners--more-reliable-service"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">But we prefer carrots to sticks. As of September 18th 2017 any API queries that <strong>use HTTPS and have appropriate contact information</strong> will be directed to a special pool of API machines that are reserved for polite users.</p> <p dir="auto">Why are we doing this? Well- we don't want to force users to have to register with us. But this means that if some user of the public server writes a buggy script or ignores timeouts and errors- they can really bring the API service to its knees. What's more, it is very hard for us to identify these problem users because they tend to work off multiple parallel machines and use generic User-Agent headers. They are effectively anonymous. We're starting to have to spend a lot of time dealing with these problems and the degraded performance of the public API is affecting all the polite users as well.</p> <p dir="auto">So... we are keeping the public service as is. It will probably continue to fluctuate widely in performance. But now, if a client connects to the API using HTTPS and provides contact information either in their User-Agent header or as a parameter on their queries, then we will send them to a separate pool of machines. We expect to be able to better control the performance of these machines because, if a script starts causing problems, we can contact the people responsible for the script to ask them to fix it. Or, in extremis, we can block it.</p> <p dir="auto">How does it work? Simple. You can do one of two things to get directed to the "polite pool":</p> <ol dir="auto"> <li>Include a "mailto" parameter in your query. For example:</li> </ol> <p dir="auto"><code>https://api.crossref.org/works?filter=has-full-text:true&mailto=GroovyBib@example.org</code></p> <ol start="2" dir="auto"> <li>Include a "mailto:" in your User-Agent header. For example:</li> </ol> <p dir="auto"><code>GroovyBib/1.1 (https://example.org/GroovyBib/; mailto:GroovyBib@example.org) BasedOnFunkyLib/1.4</code>.</p> <p dir="auto">Note that this only works if you query the API using HTTPS. You really should be doing that anyway (wags finger).</p> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">Frequently anticipated questions</h5><a id="user-content-frequently-anticipated-questions" class="anchor" aria-label="Permalink: Frequently anticipated questions" href="#frequently-anticipated-questions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><strong>Q:</strong> Will you spam me with marketing <a href="https://en.oxforddictionaries.com/definition/bumf" rel="nofollow">bumf</a> once you have our contact info?</p> <p dir="auto"><strong>A:</strong> No. We will only use it to contact you about problems with your scripts.</p> <p dir="auto"><strong>Q:</strong> Is this a secret plot to kill public access to your API?</p> <p dir="auto"><strong>A:</strong> No. It is an attempt to keep the public API reliable.</p> <p dir="auto"><strong>Q:</strong> What if I provide fake or incorrect contact info?</p> <p dir="auto"><strong>A:</strong> That is not very polite. If there is a problem and you don't respond, we'll block you.</p> <p dir="auto"><strong>Q:</strong> Does the contact info have to be a real name?</p> <p dir="auto"><strong>A:</strong> No. As long as somebody actually receives and pays attention to email at the address, it can be pseudo-anonymous, or whatever.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Rate limits</h4><a id="user-content-rate-limits" class="anchor" aria-label="Permalink: Rate limits" href="#rate-limits"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">From time to time Crossref needs to impose rate limits to ensure that the free API is usable by all. Any rate limits that are in effect will be advertised in the <code>X-Rate-Limit-Limit</code> and <code>X-Rate-Limit-Interval</code> HTTP headers.</p> <p dir="auto">For ease-of-parsing, the <code>X-Rate-Limit-Interval</code> will always be expressed in seconds. So, for example the following tells you that you should expect to be able to perform 50 requests a second:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="X-Rate-Limit-Limit: 50 X-Rate-Limit-Interval: 1s"><pre class="notranslate"><code>X-Rate-Limit-Limit: 50 X-Rate-Limit-Interval: 1s </code></pre></div> <p dir="auto">Note that if we wanted to adjust the measurement window, we could specify:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="X-Rate-Limit-Limit: 3000 X-Rate-Limit-Interval: 60s"><pre class="notranslate"><code>X-Rate-Limit-Limit: 3000 X-Rate-Limit-Interval: 60s </code></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Blocking</h4><a id="user-content-blocking" class="anchor" aria-label="Permalink: Blocking" href="#blocking"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This is always our last resort, and you can generally avoid it if you include contact information in the <code>User-Agent</code> header or <code>mailto</code> parameter as described above.</p> <p dir="auto">But seriously... this is a bummer. We really want you to use the API. If you are polite about it, you shouldn't have any problems.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Use for production services</h3><a id="user-content-use-for-production-services" class="anchor" aria-label="Permalink: Use for production services" href="#use-for-production-services"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">What if you want to use our API for a production service that cannot depend on the performance uncertainties of the free and open public API? What if you don't want to be affected by impolite people who do not follow the <a href="#api-etiquette">API Etiquette</a> guidelines? Well, if you’re interested in using these tools or APIs for production services, we <a href="https://www.crossref.org/services/metadata-delivery/plus-service/" rel="nofollow">have a service-level offering</a> called "Plus". This service provides you with access to all supported APIs and metadata, but with extra service and support guarantees.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Authorization token for Plus service</h4><a id="user-content-authorization-token-for-plus-service" class="anchor" aria-label="Permalink: Authorization token for Plus service" href="#authorization-token-for-plus-service"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When you sign up for the Plus service, you will be issued an API token that you should put in the <code>Authorization</code> header of all your rest API requests. This token will ensure that said requests get directed to a pool of machines that are reserved for "Plus" SLA users. For example, with <a href="https://curl.haxx.se/" rel="nofollow">curl</a>:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="curl -X GET \ https://api.crossref.org/works \ -H 'Crossref-Plus-API-Token: Bearer yJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJodHRwOi8vY3Jvc3NyZWYub3JnLyIsImF1ZXYZImVuaGFuY2VkY21zIiwianRpIjoiN0M5ODlFNTItMTFEQS00QkY3LUJCRUUtODFCMUM3QzE0OTZEIn0.NYe3-O066sce9R1fjMzNEvP88VqSEaYdBY622FDiG8Uq' \ -H 'User-Agent: GroovyBib/1.1 (https://example.org/GroovyBib/; mailto:GroovyBib@example.org) BasedOnFunkyLib/1.4'"><pre class="notranslate"><code>curl -X GET \ https://api.crossref.org/works \ -H 'Crossref-Plus-API-Token: Bearer yJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJodHRwOi8vY3Jvc3NyZWYub3JnLyIsImF1ZXYZImVuaGFuY2VkY21zIiwianRpIjoiN0M5ODlFNTItMTFEQS00QkY3LUJCRUUtODFCMUM3QzE0OTZEIn0.NYe3-O066sce9R1fjMzNEvP88VqSEaYdBY622FDiG8Uq' \ -H 'User-Agent: GroovyBib/1.1 (https://example.org/GroovyBib/; mailto:GroovyBib@example.org) BasedOnFunkyLib/1.4' </code></pre></div> <p dir="auto">Note that you can still be "polite" and identify yourself as well. And, of course, replace the fake token above with the real token.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">API overview</h2><a id="user-content-api-overview" class="anchor" aria-label="Permalink: API overview" href="#api-overview"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The API is generally RESTFUL and returns results in JSON. JSON formats returned by the API are documented <a href="https://github.com/Crossref/rest-api-doc/blob/master/api_format.md">here</a>.</p> <p dir="auto">The API supports HTTP and HTTPS. Examples here are provided using HTTPS.</p> <p dir="auto">You should always url-encode DOIs and parameter values when using the API. DOIs are notorious for including characters that break URLs (e.g. semicolons, hashes, slashes, ampersands, question marks, etc.).</p> <p dir="auto">Note url-encoding applies to cursors as well since they too are likely to include characters that will break URLs (e.g. <code>+</code> symbol)</p> <p dir="auto">Note that, for the sake of clarity, the examples in this document do <em>not</em> url-encode DOIs or parameter values.</p> <p dir="auto">The API will only work for Crossref DOIs. You can test the registration agency for a DOI using the following route:</p> <p dir="auto"><code>https://api.crossref.org/works/{doi}/agency</code></p> <p dir="auto">Testing the following Crossref DOI:</p> <p dir="auto"><code>10.1037/0003-066X.59.1.29</code></p> <p dir="auto">Using the URL:</p> <p dir="auto"><code>https://api.crossref.org/works/10.1037/0003-066X.59.1.29/agency</code></p> <p dir="auto">Will return the following result:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="{ status: "ok", message-type: "work-agency", message-version: "1.0.0", message: { DOI: "10.1037/0003-066x.59.1.29", agency: { id: "crossref", label: "Crossref" } } }"><pre class="notranslate"><code>{ status: "ok", message-type: "work-agency", message-version: "1.0.0", message: { DOI: "10.1037/0003-066x.59.1.29", agency: { id: "crossref", label: "Crossref" } } } </code></pre></div> <p dir="auto">If you use any of the API calls listed below with a non-Crossref DOI, you will get a <code>404</code> HTTP status response. Typical agency IDs include <code>crossref</code>, <code>datacite</code>, <code>medra</code> and also <code>public</code> for test DOIs.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Result types</h2><a id="user-content-result-types" class="anchor" aria-label="Permalink: Result types" href="#result-types"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">All results are returned in JSON. There are three general types of results:</p> <ul dir="auto"> <li>Singletons</li> <li>Headers-only</li> <li>Lists</li> </ul> <p dir="auto">The mime-type for API results is <code>application/vnd.crossref-api-message+json</code></p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Singletons</h3><a id="user-content-singletons" class="anchor" aria-label="Permalink: Singletons" href="#singletons"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Singletons are single results. Retrieving metadata for a specific identifier (e.g. DOI, ISSN, funder_identifier) typically returns in a singleton result.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Headers only</h3><a id="user-content-headers-only" class="anchor" aria-label="Permalink: Headers only" href="#headers-only"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">You can use HTTP HEAD requests to quickly determine "existence" of a singleton. The advantage of this technique is that it is very fast because it does not return any metadata- it only returns headers and an HTTP status code (200=exists, 404=does not exist).</p> <p dir="auto">To determine if member ID <code>98</code> exists:</p> <p dir="auto"><code>curl --head "https://api.crossref.org/members/98"</code></p> <p dir="auto">To determine if a journal with ISSN <code>1549-7712</code> exists:</p> <p dir="auto"><code>curl --head "https://api.crossref.org/journals/1549-7712"</code></p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Lists</h3><a id="user-content-lists" class="anchor" aria-label="Permalink: Lists" href="#lists"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Lists results can contain multiple entries. Searching or filtering typically returns a list result. A list has two parts:</p> <ul dir="auto"> <li> <p dir="auto">Summary, which include the following information:</p> <ul dir="auto"> <li>status (e.g. "ok", error)</li> <li>message-type (e.g. "work-list" )</li> <li>message-version (e.g. 1.0.0 )</li> </ul> </li> <li> <p dir="auto">Items, which will will contain the items matching the query or filter.</p> </li> </ul> <p dir="auto">Note that the "message-type" returned will differ from the mime-type:</p> <ul dir="auto"> <li>funder (singleton)</li> <li>prefix (singleton)</li> <li>member (singleton)</li> <li>work (singleton)</li> <li>work-list (list)</li> <li>funder-list (list)</li> <li>prefix-list (list)</li> <li>member-list (list)</li> </ul> <p dir="auto">Normally, an API list result will return both the summary and the items. If you want to just retrieve the summary, you can do so by specifying that the number of rows returned should be zero.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Sort order</h4><a id="user-content-sort-order" class="anchor" aria-label="Permalink: Sort order" href="#sort-order"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If the API call includes a query, then the sort order will be by the relevance score. If no query is included, then the sort order will be by DOI update date.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Selecting which elements to return</h3><a id="user-content-selecting-which-elements-to-return" class="anchor" aria-label="Permalink: Selecting which elements to return" href="#selecting-which-elements-to-return"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Crossref metadata records can be quite large. Sometimes you just want a few elements from the schema. You can "select" a subset of elements to return using the <code>select</code> parameter. This can make your API calls much more efficient. For example:</p> <p dir="auto"><code>https://api.crossref.org/works?sample=10&select=DOI,title</code></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Resource components</h2><a id="user-content-resource-components" class="anchor" aria-label="Permalink: Resource components" href="#resource-components"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Major resource components supported by the Crossref API are:</p> <ul dir="auto"> <li>works</li> <li>funders</li> <li>members</li> <li>prefixes</li> <li>types</li> <li>journals</li> </ul> <p dir="auto">These can be used alone like this</p> <markdown-accessiblity-table><table> <thead> <tr> <th align="left">resource</th> <th align="left">description</th> </tr> </thead> <tbody> <tr> <td align="left"><code>/works</code></td> <td align="left">returns a list of all works (journal articles, conference proceedings, books, components, etc), 20 per page</td> </tr> <tr> <td align="left"><code>/funders</code></td> <td align="left">returns a list of all funders in the <a href="https://github.com/Crossref/open-funder-registry">Funder Registry</a></td> </tr> <tr> <td align="left"><code>/members</code></td> <td align="left">returns a list of all Crossref members (mostly publishers)</td> </tr> <tr> <td align="left"><code>/types</code></td> <td align="left">returns a list of valid work types</td> </tr> <tr> <td align="left"><code>/licenses</code></td> <td align="left">return a list of licenses applied to works in Crossref metadata</td> </tr> <tr> <td align="left"><code>/journals</code></td> <td align="left">return a list of journals in the Crossref database</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Resource components and identifiers</h3><a id="user-content-resource-components-and-identifiers" class="anchor" aria-label="Permalink: Resource components and identifiers" href="#resource-components-and-identifiers"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Resource components can be used in conjunction with identifiers to retrieve the metadata for that identifier.</p> <markdown-accessiblity-table><table> <thead> <tr> <th align="left">resource</th> <th align="left">description</th> </tr> </thead> <tbody> <tr> <td align="left"><code>/works/{doi}</code></td> <td align="left">returns metadata for the specified Crossref DOI.</td> </tr> <tr> <td align="left"><code>/funders/{funder_id}</code></td> <td align="left">returns metadata for specified funder <strong>and</strong> its suborganizations</td> </tr> <tr> <td align="left"><code>/prefixes/{owner_prefix}</code></td> <td align="left">returns metadata for the DOI owner prefix</td> </tr> <tr> <td align="left"><code>/members/{member_id}</code></td> <td align="left">returns metadata for a Crossref member</td> </tr> <tr> <td align="left"><code>/types/{type_id}</code></td> <td align="left">returns information about a metadata work type</td> </tr> <tr> <td align="left"><code>/journals/{issn}</code></td> <td align="left">returns information about a journal with the given ISSN</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Combining resource components</h3><a id="user-content-combining-resource-components" class="anchor" aria-label="Permalink: Combining resource components" href="#combining-resource-components"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The works component can be appended to other resources.</p> <markdown-accessiblity-table><table> <thead> <tr> <th align="left">resource</th> <th align="left">description</th> </tr> </thead> <tbody> <tr> <td align="left"><code>/works/{doi}</code></td> <td align="left">returns information about the specified Crossref <code>DOI</code></td> </tr> <tr> <td align="left"><code>/funders/{funder_id}/works</code></td> <td align="left">returns list of works associated with the specified <code>funder_id</code></td> </tr> <tr> <td align="left"><code>/types/{type_id}/works</code></td> <td align="left">returns list of works of type <code>type</code></td> </tr> <tr> <td align="left"><code>/prefixes/{owner_prefix}/works</code></td> <td align="left">returns list of works associated with specified <code>owner_prefix</code></td> </tr> <tr> <td align="left"><code>/members/{member_id}/works</code></td> <td align="left">returns list of works associated with a Crossref member (deposited by a Crossref member)</td> </tr> <tr> <td align="left"><code>/journals/{issn}/works</code></td> <td align="left">returns a list of works in the given journal</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Parameters</h2><a id="user-content-parameters" class="anchor" aria-label="Permalink: Parameters" href="#parameters"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Parameters can be used to query, filter and control the results returned by the Crossref API. They can be passed as normal URI parameters or as JSON in the body of the request.</p> <markdown-accessiblity-table><table> <thead> <tr> <th align="left">parameter</th> <th align="left">description</th> </tr> </thead> <tbody> <tr> <td align="left"><code>query</code></td> <td align="left">query terms</td> </tr> <tr> <td align="left"><code>filter={filter_name}:{value}</code></td> <td align="left">filter results by specific fields</td> </tr> <tr> <td align="left"><code>rows={#}</code></td> <td align="left">results per page</td> </tr> <tr> <td align="left"><code>offset={#}</code> (max 10k)</td> <td align="left">result offset (use <code>cursor</code> for larger <code>/works</code> result sets)</td> </tr> <tr> <td align="left"><code>sample={#}</code> (max 100)</td> <td align="left">return random N results</td> </tr> <tr> <td align="left"><code>sort={#}</code></td> <td align="left">sort results by a certain field</td> </tr> <tr> <td align="left"><code>order={#}</code></td> <td align="left">set the sort order to <code>asc</code> or <code>desc</code></td> </tr> <tr> <td align="left"><code>facet={#}</code></td> <td align="left">enable facet information in responses</td> </tr> <tr> <td align="left"><code>cursor={#}</code></td> <td align="left">deep page through <code>/works</code> result sets</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">Multiple filters can be specified by separating name:value pairs with a comma:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?filter=has-orcid:true,from-pub-date:2004-04-04"><pre class="notranslate"><code>https://api.crossref.org/works?filter=has-orcid:true,from-pub-date:2004-04-04 </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Example query using URI parameters</h3><a id="user-content-example-query-using-uri-parameters" class="anchor" aria-label="Permalink: Example query using URI parameters" href="#example-query-using-uri-parameters"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/funders/100000015/works?query=global+state&filter=has-orcid:true&rows=1"><pre class="notranslate"><code>https://api.crossref.org/funders/100000015/works?query=global+state&filter=has-orcid:true&rows=1 </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Queries</h2><a id="user-content-queries" class="anchor" aria-label="Permalink: Queries" href="#queries"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Free form search queries can be made, for example, works that include <code>renear</code> and <code>ontologies</code>:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?query=renear+ontologies"><pre class="notranslate"><code>https://api.crossref.org/works?query=renear+ontologies </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Field Queries</h2><a id="user-content-field-queries" class="anchor" aria-label="Permalink: Field Queries" href="#field-queries"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Field queries are available on the <code>/works</code> route and allow for queries that match only particular fields of metadata. For example, this query matches records that contain the tokens <code>richard</code> or <code>feynman</code> (or both) in any author field:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?query.author=richard+feynman"><pre class="notranslate"><code>https://api.crossref.org/works?query.author=richard+feynman </code></pre></div> <p dir="auto">Field queries can be combined with the general <code>query</code> parameter and each other. Each query parameter is ANDed with the others:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?query.bibliographic=room+at+the+bottom&query.author=richard+feynman"><pre class="notranslate"><code>https://api.crossref.org/works?query.bibliographic=room+at+the+bottom&query.author=richard+feynman </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto"><code>/works</code> Field Queries</h3><a id="user-content-works-field-queries" class="anchor" aria-label="Permalink: /works Field Queries" href="#works-field-queries"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">These field queries are available on the <code>/works</code> route:</p> <markdown-accessiblity-table><table> <thead> <tr> <th>Field query parameter</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td><code>query.container-title</code></td> <td>Query <code>container-title</code> aka. publication name</td> </tr> <tr> <td><code>query.author</code></td> <td>Query author given and family names</td> </tr> <tr> <td><code>query.editor</code></td> <td>Query editor given and family names</td> </tr> <tr> <td><code>query.chair</code></td> <td>Query chair given and family names</td> </tr> <tr> <td><code>query.translator</code></td> <td>Query translator given and family names</td> </tr> <tr> <td><code>query.contributor</code></td> <td>Query author, editor, chair and translator given and family names</td> </tr> <tr> <td><code>query.bibliographic</code></td> <td>Query bibliographic information, useful for citation look up. Includes titles, authors, ISSNs and publication years</td> </tr> <tr> <td><code>query.affiliation</code></td> <td>Query contributor affiliations</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">Note that <code>query.title</code> has been deprecated and is no longer available. Please use <code>query.bibliographic</code> instead.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Sorting</h2><a id="user-content-sorting" class="anchor" aria-label="Permalink: Sorting" href="#sorting"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Results from a listy response can be sorted by applying the <code>sort</code> and <code>order</code> parameters. Order sets the result ordering, either <code>asc</code> or <code>desc</code>. Sort sets the field by which results will be sorted. Possible values are:</p> <markdown-accessiblity-table><table> <thead> <tr> <th>Sort value</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td><code>score</code> or <code>relevance</code></td> <td>Sort by relevance score</td> </tr> <tr> <td><code>updated</code></td> <td>Sort by date of most recent change to metadata. Currently the same as <code>deposited</code>.</td> </tr> <tr> <td><code>deposited</code></td> <td>Sort by time of most recent deposit</td> </tr> <tr> <td><code>indexed</code></td> <td>Sort by time of most recent index</td> </tr> <tr> <td><code>published</code></td> <td>Sort by publication date</td> </tr> <tr> <td><code>published-print</code></td> <td>Sort by print publication date</td> </tr> <tr> <td><code>published-online</code></td> <td>Sort by online publication date</td> </tr> <tr> <td><code>issued</code></td> <td>Sort by issued date (earliest known publication date)</td> </tr> <tr> <td><code>is-referenced-by-count</code></td> <td>Sort by number of times this DOI is referenced by other Crossref DOIs</td> </tr> <tr> <td><code>references-count</code></td> <td>Sort by number of references included in the references section of the document identified by this DOI</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">An example that sorts results in order of publication, beginning with the least recent:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?query=josiah+carberry&sort=published&order=asc"><pre class="notranslate"><code>https://api.crossref.org/works?query=josiah+carberry&sort=published&order=asc </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Facet counts</h2><a id="user-content-facet-counts" class="anchor" aria-label="Permalink: Facet counts" href="#facet-counts"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Facet counts can be retrieved by enabling faceting. Facets are enabled by providing facet field names along with a maximum number of returned term values. The larger the number of returned values, the longer the query will take. Some facet fields can accept a <code>*</code> as their maximum, which indicates that all values should be returned.</p> <p dir="auto">Facets are specified with the <code>facet</code> parameter:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?rows=0&facet=type-name:*"><pre class="notranslate"><code>https://api.crossref.org/works?rows=0&facet=type-name:* </code></pre></div> <markdown-accessiblity-table><table> <thead> <tr> <th align="left">Facet name</th> <th align="left">Maximum values</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td align="left"><code>affiliation</code></td> <td align="left"><code>*</code></td> <td>Author affiliation</td> </tr> <tr> <td align="left"><code>funder-name</code></td> <td align="left"><code>*</code></td> <td>Funder literal name as deposited alongside DOIs</td> </tr> <tr> <td align="left"><code>funder-doi</code></td> <td align="left"><code>*</code></td> <td>Funder DOI</td> </tr> <tr> <td align="left"><code>orcid</code></td> <td align="left">100</td> <td>Contributor ORCID</td> </tr> <tr> <td align="left"><code>container-title</code></td> <td align="left">100</td> <td>Work container title, such as journal title, or book title</td> </tr> <tr> <td align="left"><code>assertion</code></td> <td align="left"><code>*</code></td> <td>Custom Crossmark assertion name</td> </tr> <tr> <td align="left"><code>archive</code></td> <td align="left"><code>*</code></td> <td>Archive location</td> </tr> <tr> <td align="left"><code>update-type</code></td> <td align="left"><code>*</code></td> <td>Significant update type</td> </tr> <tr> <td align="left"><code>issn</code></td> <td align="left">100</td> <td>Journal ISSN (any - print, electronic, link)</td> </tr> <tr> <td align="left"><code>published</code></td> <td align="left"><code>*</code></td> <td>Earliest year of publication</td> </tr> <tr> <td align="left"><code>type-name</code></td> <td align="left"><code>*</code></td> <td>Work type name, such as <code>journal-article</code> or <code>book-chapter</code></td> </tr> <tr> <td align="left"><code>license</code></td> <td align="left"><code>*</code></td> <td>License URI of work</td> </tr> <tr> <td align="left"><code>category-name</code></td> <td align="left"><code>*</code></td> <td>Category name of work</td> </tr> <tr> <td align="left"><code>relation-type</code></td> <td align="left"><code>*</code></td> <td>Relation type described by work or described by another work with work as object</td> </tr> <tr> <td align="left"><code>assertion-group</code></td> <td align="left"><code>*</code></td> <td>Custom Crossmark assertion group name</td> </tr> <tr> <td align="left"><code>publisher-name</code></td> <td align="left"><code>*</code></td> <td>Publisher name of work</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Filter names</h2><a id="user-content-filter-names" class="anchor" aria-label="Permalink: Filter names" href="#filter-names"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Filters allow you to narrow queries. All filter results are lists.</p> <p dir="auto">The following filters are supported for the <code>/works</code> route:</p> <markdown-accessiblity-table><table> <thead> <tr> <th align="left">filter</th> <th align="left">possible values</th> <th align="left">description</th> </tr> </thead> <tbody> <tr> <td align="left"><code>has-funder</code></td> <td align="left"></td> <td align="left">metadata which includes one or more funder entry</td> </tr> <tr> <td align="left"><code>funder</code></td> <td align="left"><code>{funder_id}</code></td> <td align="left">metadata which include the <code>{funder_id}</code> in FundRef data</td> </tr> <tr> <td align="left"><code>location</code></td> <td align="left"><code>{country_name}</code></td> <td align="left">funder records where location = <code>{country name}</code>. Only works on <code>/funders</code> route</td> </tr> <tr> <td align="left"><code>prefix</code></td> <td align="left"><code>{owner_prefix}</code></td> <td align="left">metadata belonging to a DOI owner prefix <code>{owner_prefix}</code> (e.g. <code>10.1016</code> )</td> </tr> <tr> <td align="left"><code>member</code></td> <td align="left"><code>{member_id}</code></td> <td align="left">metadata belonging to a Crossref member</td> </tr> <tr> <td align="left"><code>from-index-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata indexed since (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>until-index-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata indexed before (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>from-deposit-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata last (re)deposited since (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>until-deposit-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata last (re)deposited before (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>from-update-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">Metadata updated since (inclusive) <code>{date}</code>. Currently the same as <code>from-deposit-date</code>.</td> </tr> <tr> <td align="left"><code>until-update-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">Metadata updated before (inclusive) <code>{date}</code>. Currently the same as <code>until-deposit-date</code>.</td> </tr> <tr> <td align="left"><code>from-created-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata first deposited since (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>until-created-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata first deposited before (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>from-pub-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where published date is since (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>until-pub-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where published date is before (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>from-online-pub-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where online published date is since (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>until-online-pub-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where online published date is before (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>from-print-pub-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where print published date is since (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>until-print-pub-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where print published date is before (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>from-posted-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where posted date is since (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>until-posted-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where posted date is before (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>from-accepted-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where accepted date is since (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>until-accepted-date</code></td> <td align="left"><code>{date}</code></td> <td align="left">metadata where accepted date is before (inclusive) <code>{date}</code></td> </tr> <tr> <td align="left"><code>has-license</code></td> <td align="left"></td> <td align="left">metadata that includes any <code><license_ref></code> elements.</td> </tr> <tr> <td align="left"><code>license.url</code></td> <td align="left"><code>{url}</code></td> <td align="left">metadata where <code><license_ref></code> value equals <code>{url}</code></td> </tr> <tr> <td align="left"><code>license.version</code></td> <td align="left"><code>{string}</code></td> <td align="left">metadata where the <code><license_ref></code>'s <code>applies_to</code> attribute is <code>{string}</code></td> </tr> <tr> <td align="left"><code>license.delay</code></td> <td align="left"><code>{integer}</code></td> <td align="left">metadata where difference between publication date and the <code><license_ref></code>'s <code>start_date</code> attribute is <= <code>{integer}</code> (in days)</td> </tr> <tr> <td align="left"><code>has-full-text</code></td> <td align="left"></td> <td align="left">metadata that includes any full text <code><resource></code> elements.</td> </tr> <tr> <td align="left"><code>full-text.version</code></td> <td align="left"><code>{string}</code></td> <td align="left">metadata where <code><resource></code> element's <code>content_version</code> attribute is <code>{string}</code>.</td> </tr> <tr> <td align="left"><code>full-text.type</code></td> <td align="left"><code>{mime_type}</code></td> <td align="left">metadata where <code><resource></code> element's <code>content_type</code> attribute is <code>{mime_type}</code> (e.g. <code>application/pdf</code>).</td> </tr> <tr> <td align="left"><code>full-text.application</code></td> <td align="left"><code>{string}</code></td> <td align="left">metadata where <code><resource></code> link has one of the following intended applications: <code>text-mining</code>, <code>similarity-checking</code> or <code>unspecified</code></td> </tr> <tr> <td align="left"><code>has-references</code></td> <td align="left"></td> <td align="left">metadata for works that have a list of references</td> </tr> <tr> <td align="left"><code>reference-visibility</code></td> <td align="left"><code>[open, limited, closed]</code></td> <td align="left">metadata for works where references are either <code>open</code>, <code>limited</code> (to <a href="https://www.crossref.org/services/metadata-delivery/plus-service/" rel="nofollow">Metadata Plus subscribers</a>) or <code>closed</code></td> </tr> <tr> <td align="left"><code>has-archive</code></td> <td align="left"></td> <td align="left">metadata which include name of archive partner</td> </tr> <tr> <td align="left"><code>archive</code></td> <td align="left"><code>{string}</code></td> <td align="left">metadata which where value of archive partner is <code>{string}</code></td> </tr> <tr> <td align="left"><code>has-orcid</code></td> <td align="left"></td> <td align="left">metadata which includes one or more ORCIDs</td> </tr> <tr> <td align="left"><code>has-authenticated-orcid</code></td> <td align="left"></td> <td align="left">metadata which includes one or more ORCIDs where the depositing publisher claims to have witness the ORCID owner authenticate with ORCID</td> </tr> <tr> <td align="left"><code>orcid</code></td> <td align="left"><code>{orcid}</code></td> <td align="left">metadata where <code><orcid></code> element's value = <code>{orcid}</code></td> </tr> <tr> <td align="left"><code>issn</code></td> <td align="left"><code>{issn}</code></td> <td align="left">metadata where record has an ISSN = <code>{issn}</code>. Format is <code>xxxx-xxxx</code>.</td> </tr> <tr> <td align="left"><code>isbn</code></td> <td align="left"><code>{isbn}</code></td> <td align="left">metadata where record has an ISBN = <code>{issn}</code>.</td> </tr> <tr> <td align="left"><code>type</code></td> <td align="left"><code>{type}</code></td> <td align="left">metadata records whose type = <code>{type}</code>. Type must be an ID value from the list of types returned by the <code>/types</code> resource</td> </tr> <tr> <td align="left"><code>directory</code></td> <td align="left"><code>{directory}</code></td> <td align="left">metadata records whose article or serial are mentioned in the given <code>{directory}</code>. Currently the only supported value is <code>doaj</code>.</td> </tr> <tr> <td align="left"><code>doi</code></td> <td align="left"><code>{doi}</code></td> <td align="left">metadata describing the DOI <code>{doi}</code></td> </tr> <tr> <td align="left"><code>updates</code></td> <td align="left"><code>{doi}</code></td> <td align="left">metadata for records that represent editorial updates to the DOI <code>{doi}</code></td> </tr> <tr> <td align="left"><code>is-update</code></td> <td align="left"></td> <td align="left">metadata for records that represent editorial updates</td> </tr> <tr> <td align="left"><code>has-update-policy</code></td> <td align="left"></td> <td align="left">metadata for records that include a link to an editorial update policy</td> </tr> <tr> <td align="left"><code>container-title</code></td> <td align="left"></td> <td align="left">metadata for records with a publication title exactly with an exact match</td> </tr> <tr> <td align="left"><code>category-name</code></td> <td align="left"></td> <td align="left">metadata for records with an exact matching category label. Category labels come from <a href="https://www.elsevier.com/solutions/scopus/content" rel="nofollow">this list</a> published by Scopus</td> </tr> <tr> <td align="left"><code>type</code></td> <td align="left"></td> <td align="left">metadata for records with type matching a type identifier (e.g. <code>journal-article</code>)</td> </tr> <tr> <td align="left"><code>type-name</code></td> <td align="left"></td> <td align="left">metadata for records with an exactly matching type label</td> </tr> <tr> <td align="left"><code>award.number</code></td> <td align="left"><code>{award_number}</code></td> <td align="left">metadata for records with a matching award nunber. Optionally combine with <code>award.funder</code></td> </tr> <tr> <td align="left"><code>award.funder</code></td> <td align="left"><code>{funder doi or id}</code></td> <td align="left">metadata for records with an award with matching funder. Optionally combine with <code>award.number</code></td> </tr> <tr> <td align="left"><code>has-assertion</code></td> <td align="left"></td> <td align="left">metadata for records with any assertions</td> </tr> <tr> <td align="left"><code>assertion-group</code></td> <td align="left"></td> <td align="left">metadata for records with an assertion in a particular group</td> </tr> <tr> <td align="left"><code>assertion</code></td> <td align="left"></td> <td align="left">metadata for records with a particular named assertion</td> </tr> <tr> <td align="left"><code>has-affiliation</code></td> <td align="left"></td> <td align="left">metadata for records that have any affiliation information</td> </tr> <tr> <td align="left"><code>alternative-id</code></td> <td align="left"></td> <td align="left">metadata for records with the given alternative ID, which may be a publisher-specific ID, or any other identifier a publisher may have provided</td> </tr> <tr> <td align="left"><code>article-number</code></td> <td align="left"></td> <td align="left">metadata for records with a given article number</td> </tr> <tr> <td align="left"><code>has-abstract</code></td> <td align="left"></td> <td align="left">metadata for records which include an abstract</td> </tr> <tr> <td align="left"><code>has-clinical-trial-number</code></td> <td align="left"></td> <td align="left">metadata for records which include a clinical trial number</td> </tr> <tr> <td align="left"><code>content-domain</code></td> <td align="left"></td> <td align="left">metadata where the publisher records a particular domain name as the location Crossmark content will appear</td> </tr> <tr> <td align="left"><code>has-content-domain</code></td> <td align="left"></td> <td align="left">metadata where the publisher records a domain name location for Crossmark content</td> </tr> <tr> <td align="left"><code>has-domain-restriction</code></td> <td align="left"></td> <td align="left">metadata where the publisher restricts Crossmark usage to content domains</td> </tr> <tr> <td align="left"><code>has-relation</code></td> <td align="left"></td> <td align="left">metadata for records that either assert or are the object of a relation</td> </tr> <tr> <td align="left"><code>relation.type</code></td> <td align="left"></td> <td align="left">One of the relation types from the Crossref relations schema (e.g. <code>is-referenced-by</code>, <code>is-parent-of</code>, <code>is-preprint-of</code>)</td> </tr> <tr> <td align="left"><code>relation.object</code></td> <td align="left"></td> <td align="left">Relations where the object identifier matches the identifier provided</td> </tr> <tr> <td align="left"><code>relation.object-type</code></td> <td align="left"></td> <td align="left">One of the identifier types from the Crossref relations schema (e.g. <code>doi</code>, <code>issn</code>)</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">The following filters are supported for the <code>/members</code> route:</p> <markdown-accessiblity-table><table> <thead> <tr> <th align="left">filter</th> <th align="left">possible values</th> <th align="left">description</th> </tr> </thead> <tbody> <tr> <td align="left"><code>has-public-references</code></td> <td align="left"></td> <td align="left">Member has made their references public for one or more of their prefixes</td> </tr> <tr> <td align="left"><code>reference-visibility</code></td> <td align="left"><code>[open, limited, closed]</code></td> <td align="left">Members who have made their references either <code>open</code>, <code>limited</code> (to <a href="https://www.crossref.org/services/metadata-delivery/plus-service/" rel="nofollow">Metadata Plus subscribers</a>) or <code>closed</code></td> </tr> <tr> <td align="left"><code>backfile-doi-count</code></td> <td align="left">{integer}</td> <td align="left">count of DOIs for material published more than two years ago</td> </tr> <tr> <td align="left"><code>current-doi-count</code></td> <td align="left">{integer}</td> <td align="left">count of DOIs for material published within last two years</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">The following filters are supported for the <code>/funders</code> route:</p> <markdown-accessiblity-table><table> <thead> <tr> <th align="left">filter</th> <th align="left">possible values</th> <th align="left">description</th> </tr> </thead> <tbody> <tr> <td align="left"><code>location</code></td> <td align="left"></td> <td align="left">funders located in specified country</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Multiple filters</h3><a id="user-content-multiple-filters" class="anchor" aria-label="Permalink: Multiple filters" href="#multiple-filters"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Multiple filters can be specified in a single query. In such a case, different filters will be applied with AND semantics, while specifying the same filter multiple times will result in OR semantics - that is, specifying the filters:</p> <ul dir="auto"> <li><code>is-update:true</code></li> <li><code>from-pub-date:2014-03-03</code></li> <li><code>funder:10.13039/100000001</code></li> <li><code>funder:10.13039/100000050</code></li> </ul> <p dir="auto">would locate documents that are updates, were published on or after 3rd March 2014 and were funded by either the National Science Foundation (<code>10.13039/100000001</code>) or the National Heart, Lung, and Blood Institute (<code>10.13039/100000050</code>). These filters would be specified by joining each filter together with a comma:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="/works?filter=is-update:true,from-pub-date:2014-03-03,funder:10.13039/100000001,funder:10.13039/100000050"><pre class="notranslate"><code>/works?filter=is-update:true,from-pub-date:2014-03-03,funder:10.13039/100000001,funder:10.13039/100000050 </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Dot filters</h3><a id="user-content-dot-filters" class="anchor" aria-label="Permalink: Dot filters" href="#dot-filters"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A filter with a dot in its name is special. The dot signifies that the filter will be applied to some other record type that is related to primary resource record type. For example, with work queries, one can filter on works that have an award, where the same award has a particular award number and award-giving funding agency:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="/works?filter=award.number:CBET-0756451,award.funder:10.13039/100000001"><pre class="notranslate"><code>/works?filter=award.number:CBET-0756451,award.funder:10.13039/100000001 </code></pre></div> <p dir="auto">Here we filter on works that have an award by the National Science Foundation that also has the award number <code>CBET-0756451</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Notes on owner prefixes</h3><a id="user-content-notes-on-owner-prefixes" class="anchor" aria-label="Permalink: Notes on owner prefixes" href="#notes-on-owner-prefixes"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The prefix of a Crossref DOI does <strong>NOT</strong> indicate who currently owns the DOI. It only reflects who originally registered the DOI. Crossref metadata has an <strong>owner_prefix</strong> element that records the current owner of the Crossref DOI in question.</p> <p dir="auto">Crossref also has member IDs for depositing organisations. A single member may control multiple owner prefixes, which in turn may control a number of DOIs. When looking at works published by a certain organisation, member IDs and the member routes should be used.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Notes on dates</h3><a id="user-content-notes-on-dates" class="anchor" aria-label="Permalink: Notes on dates" href="#notes-on-dates"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Note that dates in filters should always be of the form <code>YYYY-MM-DD</code>, <code>YYYY-MM</code> or <code>YYYY</code>. Also note that date information in Crossref metadata can often be incomplete. So, for example, a publisher may only include the year and month of publication for a journal article. For a monograph they might just include the year. In these cases the API selects the earliest possible date given the information provided. So, for instance, if the publisher only provided 2013-02 as the published date, then the date would be treated as 2013-02-01. Similarly, if the publisher only provided the year 2013 as the date, it would be treated at 2013-01-01.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Notes on incremental metadata updates</h3><a id="user-content-notes-on-incremental-metadata-updates" class="anchor" aria-label="Permalink: Notes on incremental metadata updates" href="#notes-on-incremental-metadata-updates"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When using time filters to retrieve periodic, incremental metadata updates, the <code>from-index-date</code> filter should be used over <code>from-update-date</code>, <code>from-deposit-date</code>, <code>from-created-date</code> and <code>from-pub-date</code>. The timestamp that <code>from-index-date</code> filters on is guaranteed to be updated every time there is a change to metadata requiring a reindex.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Result controls</h2><a id="user-content-result-controls" class="anchor" aria-label="Permalink: Result controls" href="#result-controls"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">You can control the delivery and selection results using the <code>rows</code>, <code>offset</code> and <code>sample</code> parameters.</p> <p dir="auto">If you are expecting results beyond 10K, then use a <code>cursor</code> to deep page through the results. Note that not all routes support cursors.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Rows</h3><a id="user-content-rows" class="anchor" aria-label="Permalink: Rows" href="#rows"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Normally, results are returned 20 at a time. You can control the number of results returns by using the <code>rows</code> parameter. To limit results to 5, for example, you could do the following:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?query=allen+renear&rows=5"><pre class="notranslate"><code>https://api.crossref.org/works?query=allen+renear&rows=5 </code></pre></div> <p dir="auto">If you would just like to get the <code>summary</code> of the results, you can set the rows to 0 (zero).</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?query=allen+renear&rows=0"><pre class="notranslate"><code>https://api.crossref.org/works?query=allen+renear&rows=0 </code></pre></div> <p dir="auto">The maximum number rows you can ask for in one query is <code>1000</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Offset</h3><a id="user-content-offset" class="anchor" aria-label="Permalink: Offset" href="#offset"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The number of returned items is controlled by the <code>rows</code> parameter, but you can select the offset into the result list by using the <code>offset</code> parameter. So, for example, to select the second set of 5 results (i.e. results 6 through 10), you would do the following:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?query=allen+renear&rows=5&offset=5"><pre class="notranslate"><code>https://api.crossref.org/works?query=allen+renear&rows=5&offset=5 </code></pre></div> <p dir="auto">Offsets for <code>/works</code> are limited to 10K. Use <code>cursor</code> (see below) for larger <code>/works</code> results sets.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Deep paging with cursors</h3><a id="user-content-deep-paging-with-cursors" class="anchor" aria-label="Permalink: Deep paging with cursors" href="#deep-paging-with-cursors"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Using large <code>offset</code> values can result in extremely long response times. Offsets in the 100,000s and beyond will likely cause a timeout before the API is able to respond. An alternative to paging through very large result sets (like a corpus used for text and data mining) is to use the API's exposure of Solr's deep paging cursors. Any combination of query, filters and facets may be used with deep paging cursors. While <code>rows</code> may be specified along with <code>cursor</code>, <code>offset</code> and <code>sample</code> cannot be used. To use deep paging make a query as normal, but include the <code>cursor</code> parameter with a value of <code>*</code>. In this example we will page through all <code>journal-article</code> works from member <code>311</code>:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/members/311/works?filter=type:journal-article&cursor=*"><pre class="notranslate"><code>https://api.crossref.org/members/311/works?filter=type:journal-article&cursor=* </code></pre></div> <p dir="auto">A <code>next-cursor</code> field will be provided in the JSON response. To get the next page of results, pass the value of <code>next-cursor</code> as the <code>cursor</code> parameter. For example:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/members/311/works?filter=type:journal-article&cursor=AoE/CGh0dHA6Ly9keC5kb2kub3JnLzEwLjEwMDIvdGRtX2xpY2Vuc2VfMQ=="><pre class="notranslate"><code>https://api.crossref.org/members/311/works?filter=type:journal-article&cursor=AoE/CGh0dHA6Ly9keC5kb2kub3JnLzEwLjEwMDIvdGRtX2xpY2Vuc2VfMQ== </code></pre></div> <p dir="auto">Note that the actual cursor value will be different from this illustration.</p> <p dir="auto">Clients should check the number of returned items. If the number of returned items is fewer than the number of expected rows then the end of the result set has been reached. Using <code>next-cursor</code> beyond this point will result in responses with an empty items list.</p> <p dir="auto">The <code>cursor</code> parameter is available on all <code>/works</code> resources.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Sample</h3><a id="user-content-sample" class="anchor" aria-label="Permalink: Sample" href="#sample"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Being able to select random results is useful for both testing and sampling. You can use the <code>sample</code> parameter to retrieve random results. So, for example, the following select 10 random works:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?sample=10"><pre class="notranslate"><code>https://api.crossref.org/works?sample=10 </code></pre></div> <p dir="auto">Note that when you use the <code>sample</code> parameter, the <code>rows</code> and <code>offset</code> parameters are ignored.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Example queries</h3><a id="user-content-example-queries" class="anchor" aria-label="Permalink: Example queries" href="#example-queries"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><strong>All works published by owner prefix <code>10.1016</code> in January 2010</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/prefixes/10.1016/works?filter=from-pub-date:2010-01,until-pub-date:2010-01"><pre class="notranslate"><code>https://api.crossref.org/prefixes/10.1016/works?filter=from-pub-date:2010-01,until-pub-date:2010-01 </code></pre></div> <p dir="auto"><strong>All works funded by <code>10.13039/100000001</code> that have a CC-BY license</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/funders/10.13039/100000001/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/"><pre class="notranslate"><code>https://api.crossref.org/funders/10.13039/100000001/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/ </code></pre></div> <p dir="auto"><strong>All works published by owner prefix 10.6064 from February 2010 to February 2013 that have a CC-BY license</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/prefixes/10.6064/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/,from-pub-date:2010-02,until-pub-date:2013-02"><pre class="notranslate"><code>https://api.crossref.org/prefixes/10.6064/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/,from-pub-date:2010-02,until-pub-date:2013-02 </code></pre></div> <p dir="auto"><strong>All works funded by <code>10.13039/100000015</code> where license = CC-BY and embargo <= 365 days</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/funders/10.13039/100000015/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/,license.delay:365"><pre class="notranslate"><code>https://api.crossref.org/funders/10.13039/100000015/works?filter=license.url:http://creativecommons.org/licenses/by/3.0/,license.delay:365 </code></pre></div> <p dir="auto">Note that the filters for license URL and maximum license embargo period (license.url and license.delay) combine to filter each document's metadata for a license with both of these properties.</p> <p dir="auto"><strong>All works where the archive partner listed = 'CLOCKSS'</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?filter=archive:CLOCKSS"><pre class="notranslate"><code>https://api.crossref.org/works?filter=archive:CLOCKSS </code></pre></div> <p dir="auto"><strong>All members with <code>hind</code> in their name (e.g. Hindawi)</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/members?query=hind"><pre class="notranslate"><code>https://api.crossref.org/members?query=hind </code></pre></div> <p dir="auto"><strong>All licenses linked to works published by Elsevier</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/v1/works?facet=license:*&filter=member:78&rows=0"><pre class="notranslate"><code>https://api.crossref.org/v1/works?facet=license:*&filter=member:78&rows=0 </code></pre></div> <p dir="auto"><strong>All licenses applied to works published in the journal <code>Pathology Research International</code></strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?facet=license:*&filter=issn:2090-8091"><pre class="notranslate"><code>https://api.crossref.org/works?facet=license:*&filter=issn:2090-8091 </code></pre></div> <p dir="auto"><strong>All works with an award numbered roughly <code>1 F31 MH11745</code> also awarded by funder with ID <code>10.13039/100000025</code></strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/works?filter=award.number:1F31MH11745,award.funder:10.13039/100000025"><pre class="notranslate"><code>https://api.crossref.org/works?filter=award.number:1F31MH11745,award.funder:10.13039/100000025 </code></pre></div> <p dir="auto"><strong>The number of DOIs that have references AND where references are <code>open</code> faceted by publisher name</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/v1.0/works?filter=has-references:true,reference-visibility:open&facet=publisher-name:*&rows=0"><pre class="notranslate"><code>https://api.crossref.org/v1.0/works?filter=has-references:true,reference-visibility:open&facet=publisher-name:*&rows=0 </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">API versioning</h2><a id="user-content-api-versioning" class="anchor" aria-label="Permalink: API versioning" href="#api-versioning"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In theory, the syntax of the API can vary independently of the result representations. In practice, major version changes in either will require changes to API clients and so versioning of the API will apply to both the API syntax and the result representation.</p> <p dir="auto">The API uses a semantic versioning scheme whereby the version number is divided into three parts delimited by periods. The first number represents the "major" release number. The second represents a "minor" release number.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="Version 1.20 ^ ^ | | major | minor"><pre class="notranslate"><code>Version 1.20 ^ ^ | | major | minor </code></pre></div> <p dir="auto"><strong>Major</strong> version increments are defined as releases that can break backwards compatibility. Crossref will only commit to supporting the latest two major releases simultaneously and legacy major releases will be supported for no more than nine months. Exceptions to these rules may be made when major releases are required to ensure the security or stability of the system.</p> <p dir="auto"><strong>Minor</strong> version increments are defined as backwards compatible. There is no limit on the number of minor versions that Crossref can roll out. Note that client applications should not have dependencies on minor versions, and Crossref will only maintain the latest minor version for the two most recent major versions.</p> <p dir="auto">Adding syntax options or metadata to representations will normally be backwards compatible and will thus normally only trigger minor version changes. Renaming or restructuring syntax options of metadata tends not to be backward compatible and will thus typically trigger major version changes</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">How to manage API versions</h3><a id="user-content-how-to-manage-api-versions" class="anchor" aria-label="Permalink: How to manage API versions" href="#how-to-manage-api-versions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If you need to tie your implementation to a specific major version of the API, you can do so by using version-specific routes. The default route redirects to the most recent version of the API. Some older major versions may be available using a version prefix. For example, to access version <code>v1</code> of the API:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="https://api.crossref.org/v1/works"><pre class="notranslate"><code>https://api.crossref.org/v1/works </code></pre></div> <p dir="auto">Each major version has no backwards incompatible changes within its public interface.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Documentation history</h2><a id="user-content-documentation-history" class="anchor" aria-label="Permalink: Documentation history" href="#documentation-history"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>V1: 2013-09-08, first draft.</li> <li>V2: 2013-09-24, reference platform deployed</li> <li>v3: 2013-09-25, reworked filters. Added API versioning doc</li> <li>v4: 2013-09-25, more filter changes.</li> <li>v5: 2013-09-27, doc mime-type and message-type relationship</li> <li>v6: 2013-10-01, updated <code>sample</code> & added examples with filters</li> <li>v6: 2013-10-01, corrected warning date</li> <li>v7: 2013-10-02, fixed typos</li> <li>v8: 2013-10-17, updated warning. Added email address</li> <li>v9: 2013-12-13, update example urls</li> <li>v10: 2013-12-13, /types routes, type filter, issn filter</li> <li>v11: 2013-12-14, indexed timestamps, has-archive and archive implemented</li> <li>v12: 2014-01-06, directory filter</li> <li>v13: 2014-02-10, new <code>/members</code>, <code>/publishers</code> becomes <code>/prefixes</code>, new <code>member</code> filter, <code>publisher</code> filter becomes <code>prefix</code></li> <li>v14: 2014-02-14, new <code>has-funder</code> filter.</li> <li>v15: 2014-02-27, new <code>/licenses</code> route</li> <li>v16: 2014-05-19, new <code>/journals</code> route, new CrossMark (updates and update policy) filters, new <code>sort</code> and <code>order</code> parameters</li> <li>v17: 2014-05-19, new <code>facet</code> query parameter</li> <li>v18: 2014-05-29, new <code>/works/{doi}/agency</code> route</li> <li>v19: 2014-06-23, new textual filters - <code>container-title</code>, <code>category-name</code>.</li> <li>v20: 2014-06-24, OR filter queries, <code>type-name</code> filter.</li> <li>v21: 2014-07-01, new <code>award.number</code> and <code>award.funder</code> relational filters.</li> <li>v22: 2014-07-16, changed title to more accurately reflect scope of API.</li> <li>v23, 2014-09-01, semantics of mutliple filters, dot filters</li> <li>v24, 2014-10-15, added info on license of Crossref metadata itself. Doh.</li> <li>v25, 2015-05-06, added link to issue tracker. Removed Warning section.</li> <li>v26, 2015-10-20, added new filters - <code>from-created-date</code>, <code>until-created-date</code>, <code>affiliation</code>, <code>has-affiliation</code>, <code>assertion-group</code>, <code>assertion</code>, <code>article-number</code>, <code>alternative-id</code></li> <li>v27, 2015-10-30, added <code>cursor</code> parameter to <code>/works</code> resources</li> <li>v28, 2016-05-09, added link to source of category lables</li> <li>v29, 2016-05-24, added field queries</li> <li>v30, 2016-09-26, highlight issue tracker</li> <li>v31, 2016-10-05, document <code>has-clinical-trial-number</code> and <code>has-abstract</code> filters</li> <li>v32, 2016-10-27, document rate limit headers</li> <li>v33, 2016-11-07, guidance on when to use <code>offset</code> vs <code>cursor</code></li> <li>v34, 2017-04-26, document support for HTTPS. Update examples to use HTTPS.</li> <li>v35, 2017-04-26, document use of head reqeusts to determine <code>existence</code></li> <li>v36, 2017-04-27, fixed license route examples to use facet/filter instead</li> <li>v37, 2017-04-27, <code>query.bibliographic</code></li> <li>v38, 2017-04-27, add v1.1 filters and sort fields</li> <li>v39, 2017-04-27, remove mention of dismax</li> <li>v40, 2017-04-27, clarify faceting feature</li> <li>v41, 2017-04-28, document <code>sample</code> max = 100, clarify cursors only work on some routes</li> <li>v42, 2017-04-28, life, the universe, and everything</li> <li>v43, 2017-04-28, reminder on the wisdom of url-encoding</li> <li>v44, 2017-04-28, clarify that field queries apply to <code>/works</code> route</li> <li>v45, 2017-04-28, document <code>location</code> filter for <code>/funders</code> route</li> <li>v46, 2017-06-14, minor text changes and new funder registry link</li> <li>v47, 2017-07-04, clarify <code>query.affiliation</code></li> <li>v48, 2017-07-13, correct "first and given" names to "given and family"</li> <li>v49, 2017-07-20, move document version history, add section on libraries</li> <li>v50, 2017-07-20, add TOC, move document history, add etiquet section, add production use section, general formatting + cleanup</li> <li>v51, 2017-07-24, clarified license of the documentation (as opposed to metadata)</li> <li>v52, 2017-07-27, removed service notice and what's new section.</li> <li>v53, 2017-08-11, mention <code>full-text.application</code> filter</li> <li>v54, 2017-09-18, add info about new "polite pool"</li> <li>v55, 2017-09-21, document <code>/member</code> and <code>/funder</code> filters. document <code>publisher-name</code> facet. document <code>select</code> parameter.</li> <li>v56, 2018-01-26, add info on frequency of indexing</li> <li>v57, 2018-02-01, document ISBN filter</li> <li>v58, 2018-02-13, document <code>reference-visibility</code> filter for <code>/works</code> and <code>/members</code> routes</li> <li>v59, 2018-02-13, added info about Mtedata Plus service. Corrected spelling. Added example of using <code>reference-visibility</code> filter.</li> <li>v60, 2018-02-22, added info for "Plus" users on use of token in <code>Authorization</code> header.</li> <li>v61, 2018-02-26, add curl example for use of token.</li> <li>v62, 2018-06-18, clarify how to parse <code>X-Rate-Limit-Limit-Interval</code></li> <li>v63, 2018-08-16, remove mistakenly listed <code>year</code> facet. <code>published</code> is correct facet name.</li> <li>v64, 2018-09-04, add text and link to status page.</li> <li>v65, 2019-07-17, updated Plus token name to new recommendation</li> <li>v66, 2019-10-16, deprecated query.title for query.bibliographic</li> <li>v67, 2020-04-28, clarify that url-encoding should be applied to all parameters including cursors.</li> <li>v68, 2021-02-22, Added link to Pitaya Julia library</li> <li>v69, 2021-04-30, Update preamble with reading advise</li> </ul> </article></div></div></div></div></div>   <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="1ZzppYiFya5J2mG6ISW1epl4CXUFYUiGYz6rH50KbEhhv4A7StpR9VtnTcFL+9BknBy6QqcX7w8cxmCVEl1N1g==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> Documentation for Crossref's REST API. 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