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<!doctype html><html lang=en-us><head><meta charset=utf-8><meta name=language content="English"><meta http-equiv=content-language content="en"><meta http-equiv=X-UA-Compatible content="IE=edge"><meta name=generator content="Hugo 0.139.4"><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="We want everybody to have access to the metadata in our API but we also acknowledge that this is not a trivial task and some help does not hurt. Here we will collect some of the tools and resources that our team prepare and that you can freely use to start your metadata exploring adventure. Choose your path: First steps API 101 for publishers, researchers, and librarians with Postman and Crossref: Postman offers an friendly interface to build and modify your API queries. In this collection you will find templates to which you can add or modify the parameters of your choice. Postman collection | Video tutorial | Slides Intro to Crossref API using code: if your aim is to create workflows to download, analyze, and visualize data, you will probably want to create programs and scripts. We currently have available the following tutorials using R and/or Python that you can use and modify to your convenience. Python notebook | R notebook Retrieve specific metadata Crossref API for funding data: how to query data from the funders endpoint and grant-type records."><meta name=author content="Ginny"><meta name=gitlastmod content="2025-04-06 16:48:21 +0100 +0100"><meta name=hugolastmod content="2025-04-06 16:48:21 +0100 +0100"><meta name=copyright content="Crossref - 2025"><meta name=twitter:label1 value="Reading time"><meta name=twitter:data1 value="3 minute read 🕑"><meta property="dc:language" content="en"><meta property="dc:format" content="text/html"><meta property="dc:rights" content="CC BY 4.0"><meta property="dc:source" content="Crossref"><meta property="dc:type" content="website"><meta property="dc:title" content="API Learning Hub"><meta property="og:title" content="API Learning Hub - Crossref"><meta property="og:site_name" content="www.crossref.org"><meta property="og:description" content="We want everybody to have access to the metadata in our API but we also acknowledge that this is not a trivial task and some help does not hurt. Here we will collect some of the tools and resources that our team prepare and that you can freely use to start your metadata exploring adventure. Choose your path: First steps API 101 for publishers, researchers, and librarians with Postman and Crossref: Postman offers an friendly interface to build and modify your API queries. In this collection you will find templates to which you can add or modify the parameters of your choice. Postman collection | Video tutorial | Slides Intro to Crossref API using code: if your aim is to create workflows to download, analyze, and visualize data, you will probably want to create programs and scripts. We currently have available the following tutorials using R and/or Python that you can use and modify to your convenience. 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<span>Contact</span></a></li></ul></div><div class="nav-col mobile order-3"><h2 id=get-involved data-toggle-sibling class="nav-toggle desktop-style">Get involved<div class=plus-wrapper><div class="plus go-yellow"></div><div class="minus go-yellow minus-1"></div></div></h2><ul id=get-involved-child class=child-list><div class=child-mobile-arrow></div><li><a href=/community/>Overview</a></li><li><a href=/membership/>Become a member</a></li><li><a href=/community/initiatives/>Initiatives</a></li><li><a href=/community/service-providers/>Service providers</a></li><li><a href=/community/special-programs/>Special programs</a></li><li><a href=/community/working-for-you/>Working for you</a></li><li><a href=/community/sponsors/>Sponsors program</a></li><li><a href=/events/>Webinars and events</a></li><li><a href=/community/ambassadors/>Ambassadors</a></li><li><a href=/working-groups/>Working groups</a></li><li><a href=/code-of-conduct/>Code of conduct</a></li><li><a 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href=/services/event-data/>Event Data</a></li><li><a href=/services/crossmark/>Crossmark</a></li></ul></div><div class="nav-col mobile order-3"><h2 id=get-involved data-toggle-sibling class="nav-toggle desktop-style">Documentation<div class=plus-wrapper><div class="plus go-yellow"></div><div class="minus go-yellow minus-1"></div></div></h2><ul id=get-involved-child class=child-list><div class=child-mobile-arrow></div><li><a href=/documentation/>Overview</a></li><li><a href=/documentation/member-setup/>Setting up as a member</a></li><li><a href=/documentation/research-nexus/>The research nexus</a></li><li><a href=/documentation/principles-practices/>Metadata principles and practices</a></li><li><a href=/documentation/register-maintain-records/>Register and maintain your records</a></li><li><a href=/documentation/schema-library/>Schema library</a></li><li><a href=/documentation/reports/>Reports</a></li><li><a href=/documentation/crossmark/>Crossmark</a></li><li><a href=/documentation/cited-by/>Cited-by</a></li><li><a href=/documentation/similarity-check/>Similarity Check</a></li><li><a href=/documentation/retrieve-metadata/>Metadata Retrieval</a></li></ul></div><div class="nav-col mobile order-3"><h2 id=get-involved data-toggle-sibling class="nav-toggle desktop-style">About us<div class=plus-wrapper><div class="plus go-yellow"></div><div class="minus go-yellow minus-1"></div></div></h2><ul id=get-involved-child class=child-list><div class=child-mobile-arrow></div><li><a href=/about/>Overview</a></li><li><a href=/operations-and-sustainability/>Operations & sustainability</a></li><li><a href=/board-and-governance/>Board & governance</a></li><li><a href=/strategy/>Strategic agenda and roadmap</a></li><li><a href=/truths/>Our truths</a></li><li><a href=/people/>Our people</a></li><li><a href=/people/org-chart/>Organisation chart</a></li><li><a href=/jobs/>Jobs</a></li></ul></div></div><div class="nav-flex posts"><div class=nav-col><span class="latest-posts light-grey-text">Latest blog posts</span></div><div class="nav-col nav2019__post"><img class=profile-pic src=https://www.crossref.org//images/staff/staff-robot-1-thumb.png alt='Helena Cousijn' height=57 width=57><div class=nav2019__post-text><h5>2025 April 08</h5><h3><a href=/blog/the-programs-approach-our-experiences-during-the-first-quarter-of-2025/>The programs approach: our experiences during the first quarter of 2025</a></h3><p><p>At the end of last year, we were excited to announce <a href=/blog/a-progress-update-and-a-renewed-commitment-to-community/>our renewed commitment to community </a>and the launch of three cross-functional programs to guide and accelerate our work. We introduced this new approach to work towards better cross-team alignment, shared responsibility, improved communication and learning, and make more progress on the things members need.</p></p></div><a href=/blog/the-programs-approach-our-experiences-during-the-first-quarter-of-2025/ class=nav2019__post-readmore>...Find out more</a></div><div class="nav-col nav2019__post"><img class=profile-pic src=https://www.crossref.org//images/staff/patricia_thumbnail.png alt='Patricia Feeney' height=57 width=57><div class=nav2019__post-text><h5>2025 March 19</h5><h3><a href=/blog/version-5.4.0-metadata-schema-update-now-available/>Version 5.4.0 metadata schema update now available</a></h3><p><p>This year, metadata development is one of our key priorities and we’re making a start with the release of version 5.4.0 of our input schema with some long-awaited changes. This is the first in what will be a series of metadata schema updates.</p><h2 id=what-is-in-this-update>What is in this update?</h2><h3 id=publication-typing-for-citations>Publication typing for citations</h3><p>This is fairly simple; we’ve added a ‘type’ attribute to the citations members supply. This means you can identify a journal article citation as a journal article, but more importantly, you can identify a dataset, software, blog post, or other citation that may not have an identifier assigned to it. This makes it easier for the many thousands of metadata users to connect these citations to identifiers. We know many publishers, particularly journal publishers, do collect this information already and will consider making this change to deposit citation types with their records.</p></p></div><a href=/blog/version-5.4.0-metadata-schema-update-now-available/ class=nav2019__post-readmore>...Find out more</a></div><div class="nav-col nav2019__post"><img class=profile-pic src=https://www.crossref.org//images/staff/martyn-1.png alt='Martyn Rittman' height=57 width=57><div class=nav2019__post-text><h5>2025 March 12</h5><h3><a href=/blog/2025-public-data-file-now-available/>2025 public data file now available</a></h3><p><p>Every year we release metadata for the full corpus of records registered with us, which can be downloaded for free in a single compressed file. This is one way in which we fulfil our mission to make metadata freely and widely available. By including the metadata of over 165 million research outputs from over 20,000 members worldwide and making them available in a standard format, we streamline access to metadata about scholarly objects such as journal articles, books, conference papers, preprints, research grants, standards, datasets, reports, blogs, and more.</p></p></div><a href=/blog/2025-public-data-file-now-available/ class=nav2019__post-readmore>...Find out more</a></div><div class="nav-col nav2019__post"><img class=profile-pic src=https://www.crossref.org//images/staff/patricia_thumbnail.png alt='Patricia Feeney' height=57 width=57><div class=nav2019__post-text><h5>2025 March 05</h5><h3><a href=/blog/come-ror-with-us-using-ror-ids-in-place-of-funder-ids/>Come ROR with us: Using ROR IDs in place of Funder IDs</a></h3><p><p>Today, we’re delighted to let you know that Crossref members can now use ROR IDs to identify funders in any place where you currently use Funder IDs in your metadata. Funder IDs remain available, but this change allows publishers, service providers, and funders to streamline workflows and introduce efficiencies by using a single open identifier for both researcher affiliations and funding organizations.</p><p>As you probably know, the <a href=https://ror.org target=_blank>Research Organization Registry (ROR)</a> is a global, community-led, carefully curated registry of open persistent identifiers for research organisations, including funding organisations. It’s a joint initiative led by the California Digital Library, Datacite and Crossref launched in 2019 that fulfills the long-standing need for an open organisation identifier.</p></p></div><a href=/blog/come-ror-with-us-using-ror-ids-in-place-of-funder-ids/ class=nav2019__post-readmore>...Find out more</a></div></div><div class=footer-colours></div></div></div><div class=logo><a class=crossref-brand href=https://www.crossref.org/><img class=site-logo src=https://www.crossref.org//img/crossref-logo-reverse.svg alt="Crossref logo"></a></div></div><div class=site-header><div class="container-fluid site-header-inner"><div class=menu-wrap><ul class=menu-icon data-toggle-nav=nav2019><li><div class=nav-burger><span></span> <span></span> <span></span></div></li><li>Menu</li></ul></div><div class=social-icons><a href=https://bsky.app/profile/crossref.bsky.social><i class="fab fa-bluesky" aria-hidden=true></i> </a><a rel=me href=https://mastodon.online/@crossref><i class="fab fa-mastodon" aria-hidden=true></i> </a><a href=https://www.linkedin.com/company/crossref><i class="fab fa-linkedin" aria-hidden=true></i> </a><a href=https://www.youtube.com/c/CrossrefVideos><i class="fab fa-youtube" aria-hidden=true></i></a></div><div class=search-icon><a href=# class=search-trigger>search</a></div><div class=hcwh-box-top><input id=howcanwehelptop class=hcwh-inner placeholder="Search entire site" tabindex=1 autocomplete=on></div><div class=logo><a class=crossref-brand href=https://www.crossref.org/><img class=site-logo src=/images/homepage-images/Crossref_25years_no-bg_logo.png alt="Crossref logo"></a></div></div></div><style>.intro-header .overlay::after{}</style><header class=intro-header style=background-image:url(https://www.crossref.org/images/banner-images/header-keys.jpg)><div class=overlay><div class=container><div class=row><div class="col-md-10 col-md-offset-1"><div class=page-heading><h1>API Learning Hub</h1></div></div></div></div></div></header><div class="container xxx"><div class=row><div class="col-md-10 col-md-offset-1"><div class=breadcrumb-wrap role=navigation aria-label="breadcrumbs navigation"><ul class=wy-breadcrumbs><li><a href=https://www.crossref.org/>Home</a><span>></span></li><li>API Learning Hub</li></ul></div></div></div><div class=row><div class="col-md-10 col-md-offset-1"><p>We want everybody to have access to the metadata in our API but we also acknowledge that this is not a trivial task and some help does not hurt. Here we will collect some of the tools and resources that our team prepare and that you can freely use to start your metadata exploring adventure.</p><h2 id=choose-your-path>Choose your path:</h2><h3 id=first-steps>First steps</h3><ul><li><strong>API 101 for publishers, researchers, and librarians with Postman and Crossref</strong>: Postman offers an friendly interface to build and modify your API queries. In this collection you will find templates to which you can add or modify the parameters of your choice.<ul><li><i class='fa fa-window-maximize font-small font-crossref-yellow'></i> <a href="https://www.postman.com/postman-student-programs/crossref-unified-resource-api/collection/uqp9uvy/crossref-unified-resource-api?action=share&creator=29447684" target=_blank>Postman collection</a> | <i class='fa fa-play font-small font-crossref-red'></i> <a href="https://www.youtube.com/watch?v=DZjAMt4wojA" target=_blank>Video tutorial</a> | <i class='fa fa-image font-small font-crossref-blue'></i> <a href="https://docs.google.com/presentation/d/1B3aijqC0Cx_zfYdJTZAX-_8WDQXDRn68MRYubAt1qUM/edit?usp=sharing" target=_blank>Slides</a></li></ul></li><li><strong>Intro to Crossref API using code:</strong> if your aim is to create workflows to download, analyze, and visualize data, you will probably want to create programs and scripts. We currently have available the following tutorials using R and/or Python that you can use and modify to your convenience.<ul><li><i class='fa fa-terminal font-small font-crossref-yellow'></i> <a href=https://gitlab.com/crossref/tutorials/intro-to-crossref-api-using-python target=_blank>Python notebook</a> | <i class='fa fa-terminal font-small font-crossref-red'></i> <a href=https://crossref.gitlab.io/tutorials/intro_to_cr_api/ target=_blank>R notebook</a></li></ul></li></ul><h3 id=retrieve-specific-metadata>Retrieve specific metadata</h3><ul><li><p><strong>Crossref API for funding data:</strong> how to query data from the funders endpoint and grant-type records.</p><ul><li><i class='fa fa-terminal font-small font-crossref-yellow'></i> <a href=https://crossref.gitlab.io/tutorials/cr-funders-r-workbook target=_blank>R dashboard</a></li></ul></li><li><p><strong>Get Crossref citations:</strong> this project contains a Jupyter notebook that shows how to compare citation counts from different Crossref endpoints.</p><ul><li><i class='fa fa-terminal font-small font-crossref-yellow'></i> <a href=https://gitlab.com/crossref/tutorials/get-crossef-citations target=_blank>Python notebook</a></li></ul></li><li><p><strong>Get journal-level metadata from Crossref’s API using R:</strong> how to retrieve journal-level metadata from a list of ISSN.</p><ul><li><i class='fa fa-terminal font-small font-crossref-yellow'></i> <a href=https://crossref.gitlab.io/tutorials/get-journal-metadata/ target=_blank>Notebook</a></li></ul></li><li><p><strong>Get Retraction Watch metadata from Crossref’s API:</strong> how to retrieve Retraction Watch and general updates.</p><ul><li><i class='fa fa-terminal font-small font-crossref-yellow'></i> <a href=https://crossref.gitlab.io/tutorials/get-rw-metadata target=_blank>R notebook</a></li></ul></li><li><p><strong>Cursor-based pagination using R:</strong> how to retrieve long lists of records using cursors.</p><ul><li><i class='fa fa-terminal font-small font-crossref-yellow'></i> <a href=https://crossref.gitlab.io/tutorials/cursor-based-pagination/ target=_blank>R notebook</a></li></ul></li></ul><h3 id=retrieve-all-the-metadata>Retrieve all the metadata</h3><p>You have an alternative to the REST API if your goal is to obtain the entire body of Crossref’s records. With the public data file you have access to every DOI ever registered with Crossref. Learn more about the <a href=/public-data-file>Public Data File</a></p><h2 id=some-convenient-tools>Some convenient tools:</h2><ul><li><p><a href=https://doi.org/10.13003/7nry-h9tg target=_blank>API cheatsheet</a>: we prepared a quick-reference sheet that you can use to get started with building your queries.</p></li><li><p>JSON-file viewer: When you make a request to the REST API you will get a <a href=https://en.wikipedia.org/wiki/JSON target=_blank>JSON file</a> in the output. If you are making requests from your web browser and depending on its version, perhaps you will need a JSON-viewer plugin. For example, click this <a href=https://api.crossref.org/types target=_blank>simple request</a>. If you see a string of seemingly disorganized text, you will need to install a plugin. Alternatively, you can use other viewers such as <a href=https://jsonhero.io/ target=_blank>JSON hero</a>, which provides an extra layer of interactivity.</p></li></ul><h2 id=related-resources>Related resources</h2><ul><li><a href=https://api.crossref.org/ target=_blank>Crossref Unified Resource API</a>: Here you will find a detailed list of the REST API endpoints, and parameters that you can use.</li><li><a href=https://www.crossref.org/documentation/retrieve-metadata/rest-api/ target=_blank>Tips for using the Crossref REST API</a>: This section from our documentation should be one of the first resources you should check for your API journey.</li><li><a href=https://gitlab.com/crossref/tutorials target=_blank>Crossref Gitlab tutorial repository</a>: Download the source code of our selection of tutorials.</li></ul></div></div><div class=row><div class="col-md-10 col-md-offset-1"></div></div><div class="row infoline"><div class="col-md-10 col-md-offset-1"><p>Page owner: Luis Montilla   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