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<span>Main features</span> </div> </a> <ul id="toc-Main_features-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Use_cases_and_production_deployments" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Use_cases_and_production_deployments"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Use cases and production deployments</span> </div> </a> <button aria-controls="toc-Use_cases_and_production_deployments-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Use cases and production deployments subsection</span> </button> <ul id="toc-Use_cases_and_production_deployments-sublist" class="vector-toc-list"> <li id="toc-Users" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Users"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Users</span> </div> </a> <ul id="toc-Users-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Data_manipulation:_documents_and_views" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Data_manipulation:_documents_and_views"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Data manipulation: documents and views</span> </div> </a> <button aria-controls="toc-Data_manipulation:_documents_and_views-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Data manipulation: documents and views subsection</span> </button> <ul id="toc-Data_manipulation:_documents_and_views-sublist" class="vector-toc-list"> <li id="toc-Accessing_data_via_HTTP" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Accessing_data_via_HTTP"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Accessing data via HTTP</span> </div> </a> <ul id="toc-Accessing_data_via_HTTP-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Open_source_components" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Open_source_components"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Open source components</span> </div> </a> <ul id="toc-Open_source_components-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item 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class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Table of Contents" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Apache CouchDB</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 16 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-16" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">16 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%83%D8%A7%D9%88%D8%AA%D8%B4_%D8%AF%D9%8A_%D8%A8%D9%8A" title="كاوتش دي بي – Arabic" lang="ar" hreflang="ar" data-title="كاوتش دي بي" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/CouchDB" title="CouchDB – Catalan" lang="ca" hreflang="ca" data-title="CouchDB" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/CouchDB" title="CouchDB – Czech" lang="cs" hreflang="cs" data-title="CouchDB" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/CouchDB" title="CouchDB – German" lang="de" hreflang="de" data-title="CouchDB" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/CouchDB" title="CouchDB – Spanish" lang="es" hreflang="es" data-title="CouchDB" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%A9%D8%A7%D9%88%DA%86%E2%80%8C%D8%AF%DB%8C%E2%80%8C%D8%A8%DB%8C" title="کاوچ‌دی‌بی – Persian" lang="fa" hreflang="fa" data-title="کاوچ‌دی‌بی" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/CouchDB" title="CouchDB – French" lang="fr" hreflang="fr" data-title="CouchDB" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%B9%B4%EC%9A%B0%EC%B9%98DB" title="카우치DB – Korean" lang="ko" hreflang="ko" data-title="카우치DB" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/CouchDB" title="CouchDB – Italian" lang="it" hreflang="it" data-title="CouchDB" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Apache_CouchDB" title="Apache CouchDB – Japanese" lang="ja" hreflang="ja" data-title="Apache CouchDB" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/CouchDB" title="CouchDB – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="CouchDB" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/CouchDB" title="CouchDB – Polish" lang="pl" hreflang="pl" data-title="CouchDB" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/CouchDB" title="CouchDB – Portuguese" lang="pt" hreflang="pt" data-title="CouchDB" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/CouchDB" title="CouchDB – Russian" lang="ru" hreflang="ru" data-title="CouchDB" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/Apache_CouchDB" title="Apache CouchDB – Ukrainian" lang="uk" hreflang="uk" data-title="Apache CouchDB" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/CouchDB" title="CouchDB – Chinese" lang="zh" hreflang="zh" data-title="CouchDB" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1136882#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> 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.mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-Cleanup_press_release plainlinks metadata ambox ambox-content" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/40px-Ambox_important.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/60px-Ambox_important.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/80px-Ambox_important.svg.png 2x" data-file-width="40" data-file-height="40" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>reads like <a href="/wiki/Wikipedia:What_Wikipedia_is_not#PROMO" title="Wikipedia:What Wikipedia is not">a press release</a> or <a href="/wiki/Wikipedia:What_Wikipedia_is_not#NEWS" title="Wikipedia:What Wikipedia is not">a news article</a></b> and may be <b>largely based on <a href="/wiki/Wikipedia:Notability_(events)#Routine_coverage" title="Wikipedia:Notability (events)">routine coverage</a></b>.<span class="hide-when-compact"> Please help <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Apache_CouchDB&action=edit">improve this article</a> and add <a href="/wiki/Wikipedia:Independent_sources" title="Wikipedia:Independent sources">independent sources</a>.</span> <span class="date-container"><i>(<span class="date">November 2023</span>)</i></span></div></td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="/wiki/Couchbase_Server" title="Couchbase Server">Couchbase Server</a>.</div> <div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Document-oriented NoSQL database</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vevent"><caption class="infobox-title summary">Apache CouchDB</caption><tbody><tr><td colspan="2" class="infobox-image logo"><span typeof="mw:File"><a href="/wiki/File:Apache_CouchDB_logo.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Apache_CouchDB_logo.svg/120px-Apache_CouchDB_logo.svg.png" decoding="async" width="100" height="101" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Apache_CouchDB_logo.svg/250px-Apache_CouchDB_logo.svg.png 1.5x" data-file-width="290" data-file-height="293" /></a></span></td></tr><tr><td colspan="2" class="infobox-image logo"><span typeof="mw:File"><a href="/wiki/File:Apache_CouchDB_v2.1.1_Fauxton_Console.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Apache_CouchDB_v2.1.1_Fauxton_Console.png/330px-Apache_CouchDB_v2.1.1_Fauxton_Console.png" decoding="async" width="300" height="252" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Apache_CouchDB_v2.1.1_Fauxton_Console.png/500px-Apache_CouchDB_v2.1.1_Fauxton_Console.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Apache_CouchDB_v2.1.1_Fauxton_Console.png/960px-Apache_CouchDB_v2.1.1_Fauxton_Console.png 2x" data-file-width="1109" data-file-height="931" /></a></span><div class="infobox-caption">CouchDB's Fauxton Administration Interface, User database</div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Original author(s)</a></th><td class="infobox-data">Damien Katz, Jan Lehnardt, Naomi Slater, Christopher Lenz, J. Chris Anderson, Paul Davis, Adam Kocoloski, Jason Davies, Benoît Chesneau, Filipe Manana, Robert Newson</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Developer(s)</a></th><td class="infobox-data"><a href="/wiki/Apache_Software_Foundation" class="mw-redirect" title="Apache Software Foundation">Apache Software Foundation</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">2005<span class="noprint">; 20 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">2005</span>)</span></td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546" /></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_release_life_cycle" title="Software release life cycle">Stable release</a></th><td class="infobox-data"><div style="margin:0px;">3.4.3<sup id="cite_ref-wikidata-82afc354ee6179453e597e48404fec36760eb5ea-v18_1-0" class="reference"><a href="#cite_note-wikidata-82afc354ee6179453e597e48404fec36760eb5ea-v18-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q1136882?uselang=en#P348" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span> / 17 March 2025<span class="noprint">; 19 days ago</span><span style="display:none"> (<span class="bday dtstart published updated">17 March 2025</span>)</span></div></td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Repository_(version_control)" title="Repository (version control)">Repository</a></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><span class="url"><a rel="nofollow" class="external text" href="https://github.com/apache/couchdb">github<wbr />.com<wbr />/apache<wbr />/couchdb</a></span> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q1136882#P1324" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></li></ul> </div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data"><a href="/wiki/Erlang_(programming_language)" title="Erlang (programming language)">Erlang</a>, <a href="/wiki/JavaScript" title="JavaScript">JavaScript</a>, <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a>, <a href="/wiki/C%2B%2B" title="C++">C++</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Operating_system" title="Operating system">Operating system</a></th><td class="infobox-data"><a href="/wiki/Cross-platform" class="mw-redirect" title="Cross-platform">Cross-platform</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="/wiki/Document-oriented_database" title="Document-oriented database">Document-oriented database</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="/wiki/Apache_License_2.0" class="mw-redirect" title="Apache License 2.0">Apache License 2.0</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="https://couchdb.apache.org/">couchdb<wbr />.apache<wbr />.org</a></span> <span class="penicon autoconfirmed-show"><span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q1136882?uselang=en#P856" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></td></tr></tbody></table> <p><b>Apache CouchDB</b> is an <a href="/wiki/Open-source_software" title="Open-source software">open-source</a> <a href="/wiki/Document-oriented_database" title="Document-oriented database">document-oriented</a> <a href="/wiki/NoSQL" title="NoSQL">NoSQL</a> database, implemented in <a href="/wiki/Erlang_(programming_language)" title="Erlang (programming language)">Erlang</a>. </p><p>CouchDB uses multiple formats and protocols to store, transfer, and process its data. It uses <a href="/wiki/JSON" title="JSON">JSON</a> to store data, <a href="/wiki/JavaScript" title="JavaScript">JavaScript</a> as its query language using <a href="/wiki/MapReduce" title="MapReduce">MapReduce</a>, and <a href="/wiki/HTTP" title="HTTP">HTTP</a> for an <a href="/wiki/API" title="API">API</a>.<sup id="cite_ref-official-website_2-0" class="reference"><a href="#cite_note-official-website-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>CouchDB was first released in 2005 and later became an <a href="/wiki/Apache_Software_Foundation" class="mw-redirect" title="Apache Software Foundation">Apache Software Foundation</a> project in 2008. </p><p>Unlike a <a href="/wiki/Relational_database" title="Relational database">relational database</a>, a CouchDB database does not store data and relationships in tables. Instead, each database is a collection of independent documents. Each document maintains its own data and self-contained schema. An application may access multiple databases, such as one stored on a user's mobile phone and another on a server. Document metadata contains revision information, making it possible to merge any differences that may have occurred while the databases were disconnected. </p><p>CouchDB implements a form of <a href="/wiki/Multiversion_concurrency_control" title="Multiversion concurrency control">multiversion concurrency control</a> (MVCC) so it does not lock the database file during writes. Conflicts are left to the application to resolve. Resolving a conflict generally involves first merging data into one of the documents, then deleting the stale one.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>Other features include document-level <a href="/wiki/ACID" title="ACID">ACID</a> semantics with <a href="/wiki/Eventual_consistency" title="Eventual consistency">eventual consistency</a>, (incremental) MapReduce, and (incremental) replication. One of CouchDB's distinguishing features is <a href="/wiki/Multi-master_replication" title="Multi-master replication">multi-master replication</a>, which allows it to scale across machines to build high-performance systems. A built-in Web application called Fauxton (formerly Futon) helps with administration. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><i>Couch</i> is an acronym for <i>cluster of unreliable commodity hardware</i>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The CouchDB project was created in April 2005 by Damien Katz, a former <a href="/wiki/Lotus_Notes" class="mw-redirect" title="Lotus Notes">Lotus Notes</a> developer at <a href="/wiki/IBM" title="IBM">IBM</a>. He self-funded the project for almost two years and released it as an open-source project under the <a href="/wiki/GNU_General_Public_License" title="GNU General Public License">GNU General Public License</a>. </p><p>In February 2008, it became an Apache Incubator project and was offered under the <a href="/wiki/Apache_License" title="Apache License">Apache License</a> instead.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> A few months after, it graduated to a top-level project.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> This led to the first stable version being released in July 2010.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>In early 2012, Katz left the project to focus on <a href="/wiki/Couchbase_Server" title="Couchbase Server">Couchbase Server</a>.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p>Since Katz's departure, the Apache CouchDB project has continued, releasing 1.2 in April 2012 and 1.3 in April 2013. In July 2013, the CouchDB community merged the codebase for <a href="/wiki/BigCouch" title="BigCouch">BigCouch</a>, <a href="/wiki/Cloudant" title="Cloudant">Cloudant</a>'s clustered version of CouchDB, into the Apache project.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> The BigCouch clustering framework is included in the current release of Apache CouchDB.<sup id="cite_ref-couch2bigcouch_10-0" class="reference"><a href="#cite_note-couch2bigcouch-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>Native clustering is supported at version 2.0.0. And the new Mango Query Server provides a simple JSON-based way to perform CouchDB queries without JavaScript or MapReduce. Also in version 2.0.0 was the introduction of Fauxton, the new built-in web interface, to replace Futon, the old built-in web interface.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Main_features">Main features</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=2" title="Edit section: Main features"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dt>ACID Semantics</dt> <dd>CouchDB provides <a href="/wiki/Atomicity,_consistency,_isolation,_durability" class="mw-redirect" title="Atomicity, consistency, isolation, durability">ACID</a> semantics.<sup id="cite_ref-ACID_12-0" class="reference"><a href="#cite_note-ACID-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> It does this by implementing a form of <a href="/wiki/Multi-Version_Concurrency_Control" class="mw-redirect" title="Multi-Version Concurrency Control">Multi-Version Concurrency Control</a>, meaning that CouchDB can handle a high volume of concurrent readers and writers without conflict.</dd> <dt>Built for Offline</dt> <dd>CouchDB can replicate to devices (like smartphones) that can go offline and handle data sync for you when the device is back online.</dd> <dt>Distributed Architecture with Replication</dt> <dd>CouchDB was designed with bi-directional replication (or synchronization) and off-line operation in mind. That means multiple replicas can have their own copies of the same data, modify it, and then sync those changes at a later time.</dd> <dt>Document Storage</dt> <dd>CouchDB stores data as "documents", as one or more field/value pairs expressed as <a href="/wiki/JSON" title="JSON">JSON</a>. Field values can be simple things like strings, numbers, or dates; but <a href="/wiki/Array_data_structure" class="mw-redirect" title="Array data structure">ordered lists</a> and <a href="/wiki/Associative_array" title="Associative array">associative arrays</a> can also be used. Every document in a CouchDB database has a unique id and there is no required document schema.</dd> <dt>Eventual Consistency</dt> <dd>CouchDB guarantees <a href="/wiki/Eventual_consistency" title="Eventual consistency">eventual consistency</a> to be able to provide both availability and partition tolerance.</dd> <dt>Map/Reduce Views and Indexes</dt> <dd>The stored data is structured using views. In CouchDB, each view is constructed by a <a href="/wiki/JavaScript" title="JavaScript">JavaScript</a> function that acts as the Map half of a <a href="/wiki/Map_(higher-order_function)" title="Map (higher-order function)">map</a>/reduce operation. The function takes a document and transforms it into a single value that it returns. CouchDB can index views and keep those indexes updated as documents are added, removed, or updated.</dd> <dt>HTTP API</dt> <dd>All items have a unique URI that gets exposed via HTTP. It uses the <a href="/wiki/Hypertext_Transfer_Protocol#Request_methods" class="mw-redirect" title="Hypertext Transfer Protocol">HTTP methods</a> POST, GET, PUT and DELETE for the four basic <a href="/wiki/Create,_read,_update_and_delete" title="Create, read, update and delete">CRUD</a> (Create, Read, Update, Delete) operations on all resources.</dd></dl> <p>CouchDB also offers a built-in administration interface accessible via Web called Fauxton.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Use_cases_and_production_deployments">Use cases and production deployments</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=3" title="Edit section: Use cases and production deployments"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Replication and synchronization capabilities of CouchDB make it ideal for using it in mobile devices, where network connection is not guaranteed, and the application must keep on working offline. </p><p>CouchDB is well suited for applications with accumulating, occasionally changing data, on which pre-defined queries are to be run and where versioning is important (CRM, CMS systems, by example). Master-master replication is an especially interesting feature, allowing easy multi-site deployments.<sup id="cite_ref-Analyse_Kristof_Kovacs_14-0" class="reference"><a href="#cite_note-Analyse_Kristof_Kovacs-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Users">Users</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=4" title="Edit section: Users"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Users of CouchDB include: </p> <ul><li><a href="/wiki/CERN" title="CERN">CERN</a> uses CouchDB as database for the Data Management System at the <a href="/wiki/Large_Hadron_Collider" title="Large Hadron Collider">Large Hadron Collider</a>.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Red_Cross" class="mw-redirect" title="Red Cross">Red Cross</a> use the application iDAT for completing casework electronically in disaster areas. Here CouchDB is used as multi-node peer-to-peer offline-first database.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/IBM" title="IBM">IBM</a> Cloud services are based at a fundamental level on CouchDB.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/United_Airlines" title="United Airlines">United Airlines</a> uses CouchDB for the in-flight entertainment systems in over 3,000 planes.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Amadeus_IT_Group" title="Amadeus IT Group">Amadeus IT Group</a>, for some of their back-end systems.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (June 2015)">citation needed</span></a></i>]</sup></li> <li><a href="/wiki/Credit_Suisse" title="Credit Suisse">Credit Suisse</a>, for internal use at commodities department for their marketplace framework.<sup id="cite_ref-couchdbinthewild_20-0" class="reference"><a href="#cite_note-couchdbinthewild-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup><sup class="noprint Inline-Template noprint noexcerpt Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:NOTRS" class="mw-redirect" title="Wikipedia:NOTRS"><span title="Given source is a wiki. See WP:SPS. (June 2015)">better source needed</span></a></i>]</sup></li> <li><a href="/wiki/Meebo" title="Meebo">Meebo</a>, for their social platform (Web and applications).<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (January 2016)">citation needed</span></a></i>]</sup> Meebo was acquired by Google and most products were shut down on July 12, 2012.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Npm_(software)" class="mw-redirect" title="Npm (software)">npm</a> uses CouchDB as replicating database for their package registry.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Sophos" title="Sophos">Sophos</a>, for some of their back-end systems.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (June 2015)">citation needed</span></a></i>]</sup></li> <li><a href="/wiki/BBC" title="BBC">BBC</a>, for a dynamic CMS-Platform.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Canonical_(company)" title="Canonical (company)">Canonical</a> began using it in 2009 for its synchronization service "Ubuntu One",<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> but stopped using it in November 2011.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Canal%2B_(French_TV_channel)" title="Canal+ (French TV channel)">CANAL+</a> for international on-demand platform at CANAL+ Overseas.</li> <li><a href="/w/index.php?title=Protogrid&action=edit&redlink=1" class="new" title="Protogrid (page does not exist)">Protogrid</a>, as storage back-end for their rapid application development framework <sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Data_manipulation:_documents_and_views">Data manipulation: documents and views</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=5" title="Edit section: Data manipulation: documents and views"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>CouchDB manages a collection of <a href="/wiki/JSON" title="JSON">JSON</a> documents. The documents are organised via views. Views are defined with <a href="/wiki/Aggregate_function" title="Aggregate function">aggregate functions</a> and filters are computed in parallel, much like <a href="/wiki/MapReduce" title="MapReduce">MapReduce</a>. </p><p>Views are generally stored in the database and their indexes are updated continuously. CouchDB supports a view system using external socket servers and a JSON-based protocol.<sup id="cite_ref-Apache,_View_Server_27-0" class="reference"><a href="#cite_note-Apache,_View_Server-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> As a consequence, view servers have been developed in a variety of languages (JavaScript is the default, but there are also PHP, Ruby, Python and Erlang). </p> <div class="mw-heading mw-heading3"><h3 id="Accessing_data_via_HTTP">Accessing data via HTTP</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=6" title="Edit section: Accessing data via HTTP"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Applications interact with CouchDB via HTTP. The following demonstrates a few examples using <a href="/wiki/CURL" title="CURL">cURL</a>, a command-line utility. These examples assume that CouchDB is running on <a href="/wiki/Localhost" title="Localhost">localhost</a> (127.0.0.1) on port 5984. </p> <table class="wikitable"> <tbody><tr> <th>Action</th> <th>Request</th> <th>Response </th></tr> <tr> <td>Accessing server information </td> <td><div class="mw-highlight mw-highlight-lang-bash mw-content-ltr" dir="ltr"><pre><span></span>curl<span class="w"> </span>http://127.0.0.1:5984/ </pre></div> </td> <td><div class="mw-highlight mw-highlight-lang-javascript mw-content-ltr" dir="ltr"><pre><span></span><span class="p">{</span> <span class="w"> </span><span class="s2">"couchdb"</span><span class="o">:</span><span class="w"> </span><span class="s2">"Welcome"</span><span class="p">,</span> <span class="w"> </span><span class="s2">"version"</span><span class="o">:</span><span class="s2">"1.1.0"</span> <span class="p">}</span> </pre></div> </td></tr> <tr> <td>Creating a database named <b>wiki</b> </td> <td><div class="mw-highlight mw-highlight-lang-bash mw-content-ltr" dir="ltr"><pre><span></span>curl<span class="w"> </span>-X<span class="w"> </span>PUT<span class="w"> </span>http://127.0.0.1:5984/wiki </pre></div> </td> <td><div class="mw-highlight mw-highlight-lang-javascript mw-content-ltr" dir="ltr"><pre><span></span><span class="p">{</span><span class="s2">"ok"</span><span class="o">:</span><span class="w"> </span><span class="kc">true</span><span class="p">}</span> </pre></div> </td></tr> <tr> <td>Attempting to create a second database named <b>wiki</b> </td> <td><div class="mw-highlight mw-highlight-lang-bash mw-content-ltr" dir="ltr"><pre><span></span>curl<span class="w"> </span>-X<span class="w"> </span>PUT<span class="w"> </span>http://127.0.0.1:5984/wiki </pre></div> </td> <td><div class="mw-highlight mw-highlight-lang-javascript mw-content-ltr" dir="ltr"><pre><span></span><span class="p">{</span> <span class="w"> </span><span class="s2">"error"</span><span class="o">:</span><span class="s2">"file_exists"</span><span class="p">,</span> <span class="w"> </span><span class="s2">"reason"</span><span class="o">:</span><span class="s2">"The database could not be created, the file already exists."</span> <span class="p">}</span> </pre></div> </td></tr> <tr> <td>Retrieve information about the <b>wiki</b> database </td> <td><div class="mw-highlight mw-highlight-lang-bash mw-content-ltr" dir="ltr"><pre><span></span>curl<span class="w"> </span>http://127.0.0.1:5984/wiki </pre></div> </td> <td><div class="mw-highlight mw-highlight-lang-javascript mw-content-ltr" dir="ltr"><pre><span></span><span class="p">{</span> <span class="w"> </span><span class="s2">"db_name"</span><span class="o">:</span><span class="w"> </span><span class="s2">"wiki"</span><span class="p">,</span> <span class="w"> </span><span class="s2">"doc_count"</span><span class="o">:</span><span class="w"> </span><span class="mf">0</span><span class="p">,</span> <span class="w"> </span><span class="s2">"doc_del_count"</span><span class="o">:</span><span class="w"> </span><span class="mf">0</span><span class="p">,</span> <span class="w"> </span><span class="s2">"update_seq"</span><span class="o">:</span><span class="w"> </span><span class="mf">0</span><span class="p">,</span> <span class="w"> </span><span class="s2">"purge_seq"</span><span class="o">:</span><span class="w"> </span><span class="mf">0</span><span class="p">,</span> <span class="w"> </span><span class="s2">"compact_running"</span><span class="o">:</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span> <span class="w"> </span><span class="s2">"disk_size"</span><span class="o">:</span><span class="w"> </span><span class="mf">79</span><span class="p">,</span> <span class="w"> </span><span class="s2">"instance_start_time"</span><span class="o">:</span><span class="w"> </span><span class="s2">"1272453873691070"</span><span class="p">,</span> <span class="w"> </span><span class="s2">"disk_format_version"</span><span class="o">:</span><span class="w"> </span><span class="mf">5</span> <span class="p">}</span> </pre></div> </td></tr> <tr> <td>Delete the database <b>wiki</b> </td> <td><div class="mw-highlight mw-highlight-lang-bash mw-content-ltr" dir="ltr"><pre><span></span>curl<span class="w"> </span>-X<span class="w"> </span>DELETE<span class="w"> </span>http://127.0.0.1:5984/wiki </pre></div> </td> <td><div class="mw-highlight mw-highlight-lang-javascript mw-content-ltr" dir="ltr"><pre><span></span><span class="p">{</span><span class="s2">"ok"</span><span class="o">:</span><span class="w"> </span><span class="kc">true</span><span class="p">}</span> </pre></div> </td></tr> <tr> <td>Create a document, asking CouchDB to supply a document id </td> <td><div class="mw-highlight mw-highlight-lang-bash mw-content-ltr" dir="ltr"><pre><span></span>curl<span class="w"> </span>-X<span class="w"> </span>POST<span class="w"> </span>-H<span class="w"> </span><span class="s2">"Content-Type: application/json"</span><span class="w"> </span>--data<span class="w"> </span><span class="se">\</span> <span class="s1">'{ "text" : "Wikipedia on CouchDB", "rating": 5 }'</span><span class="w"> </span><span class="se">\</span> http://127.0.0.1:5984/wiki </pre></div> </td> <td><div class="mw-highlight mw-highlight-lang-javascript mw-content-ltr" dir="ltr"><pre><span></span><span class="p">{</span> <span class="w"> </span><span class="s2">"ok"</span><span class="o">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span> <span class="w"> </span><span class="s2">"id"</span><span class="o">:</span><span class="w"> </span><span class="s2">"123BAC"</span><span class="p">,</span> <span class="w"> </span><span class="s2">"rev"</span><span class="o">:</span><span class="w"> </span><span class="s2">"946B7D1C"</span> <span class="p">}</span> </pre></div> </td></tr> <tr> <td>get a list of databases </td> <td><div class="mw-highlight mw-highlight-lang-bash mw-content-ltr" dir="ltr"><pre><span></span>curl<span class="w"> </span>http://127.0.0.1:5984/_all_dbs </pre></div> </td> <td><div class="mw-highlight mw-highlight-lang-javascript mw-content-ltr" dir="ltr"><pre><span></span><span class="p">[</span><span class="s2">"_replicator"</span><span class="p">,</span><span class="s2">"_users"</span><span class="p">,</span><span class="s2">"wiki"</span><span class="p">]</span> </pre></div> </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Open_source_components">Open source components</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=7" title="Edit section: Open source components"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>CouchDB includes a number of other open source projects as part of its default package. </p> <table class="wikitable sortable" width="100%"> <tbody><tr> <th>Component </th> <th>Description </th> <th>License </th></tr> <tr> <td><a href="/wiki/Erlang_(programming_language)" title="Erlang (programming language)">Erlang</a> </td> <td>Erlang is a general-purpose <a href="/wiki/Concurrent_computing" title="Concurrent computing">concurrent</a> <a href="/wiki/Programming_language" title="Programming language">programming language</a> and <a href="/wiki/Run_time_system" class="mw-redirect" title="Run time system">runtime</a> system. The sequential subset of Erlang is a <a href="/wiki/Functional_language" class="mw-redirect" title="Functional language">functional language</a> with <a href="/wiki/Strict_evaluation" class="mw-redirect" title="Strict evaluation">strict evaluation</a>, <a href="/wiki/Single_assignment" class="mw-redirect" title="Single assignment">single assignment</a>, and <a href="/wiki/Dynamic_typing" class="mw-redirect" title="Dynamic typing">dynamic typing</a> </td> <td><a href="/wiki/Apache_License" title="Apache License">Apache 2.0</a> (Release 18.0 and later)<br /><a href="/wiki/Erlang_Public_License" title="Erlang Public License">Erlang Public License</a> (Earlier releases) </td></tr> <tr> <td><a href="/wiki/International_Components_for_Unicode" title="International Components for Unicode">ICU</a> </td> <td>International Components for Unicode (ICU) is an <a href="/wiki/Open-source_software" title="Open-source software">open-source</a> project of mature <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a>/<a href="/wiki/C%2B%2B" title="C++">C++</a> and <a href="/wiki/Java_(programming_language)" title="Java (programming language)">Java</a> libraries for <a href="/wiki/Unicode" title="Unicode">Unicode</a> support, software <a href="/wiki/Internationalization" title="Internationalization">internationalization</a> and software globalization </td> <td><a href="/w/index.php?title=Unicode_License&action=edit&redlink=1" class="new" title="Unicode License (page does not exist)">Unicode License</a> </td></tr> <tr> <td><a href="/wiki/JQuery" title="JQuery">jQuery</a> </td> <td>jQuery is a lightweight <a href="/wiki/Cross-browser" class="mw-redirect" title="Cross-browser">cross-browser</a> <a href="/wiki/JavaScript_library" title="JavaScript library">JavaScript library</a> that emphasizes interaction between <a href="/wiki/JavaScript" title="JavaScript">JavaScript</a> and <a href="/wiki/HTML" title="HTML">HTML</a> </td> <td><a href="/wiki/MIT_License" title="MIT License">MIT License</a> </td></tr> <tr> <td><a href="/wiki/OpenSSL" title="OpenSSL">OpenSSL</a> </td> <td>OpenSSL is an <a href="/wiki/Open-source_software" title="Open-source software">open-source</a> implementation of the <a href="/wiki/Transport_Layer_Security" title="Transport Layer Security">SSL and TLS</a> protocols. The core <a href="/wiki/Library_(computer_science)" class="mw-redirect" title="Library (computer science)">library</a> (written in the <a href="/wiki/C_(programming_language)" title="C (programming language)">C programming language</a>) implements the basic <a href="/wiki/Cryptography" title="Cryptography">cryptographic</a> functions and provides various utility functions </td> <td><a href="/wiki/Apache_License" title="Apache License">Apache 1.0</a> and the <a href="/wiki/BSD_License#4-clause_license_(original_"BSD_License")" class="mw-redirect" title="BSD License">four-clause BSD License</a> </td></tr> <tr> <td><a href="/wiki/SpiderMonkey" title="SpiderMonkey">SpiderMonkey</a> </td> <td>SpiderMonkey is a performant <a href="/wiki/JavaScript_engine" title="JavaScript engine">JavaScript engine</a> maintained by the <a href="/wiki/Mozilla_Foundation" title="Mozilla Foundation">Mozilla Foundation</a>. It contains an <a href="/wiki/Interpreted_language" class="mw-redirect" title="Interpreted language">interpreter</a>, a <a href="/wiki/JIT_compiler" class="mw-redirect" title="JIT compiler">JIT compiler</a> and a <a href="/wiki/Garbage_collection_(computer_science)" title="Garbage collection (computer science)">garbage collector</a> </td> <td><a href="/wiki/Mozilla_Public_License" title="Mozilla Public License">MPL 2.0</a> </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=8" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1266661725">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid 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decoding="async" width="28" height="28" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/42px-Free_and_open-source_software_logo_%282009%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/56px-Free_and_open-source_software_logo_%282009%29.svg.png 2x" data-file-width="512" data-file-height="512" /></span></span></span><span class="portalbox-link"><a href="/wiki/Portal:Free_and_open-source_software" title="Portal:Free and open-source software">Free and open-source software portal</a></span></li></ul> <ul><li><a href="/wiki/Document-oriented_database" title="Document-oriented database">Document-oriented database</a></li> <li><a href="/wiki/XML_database" title="XML database">XML database</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=9" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width reflist-columns-3"> <ol class="references"> <li id="cite_note-wikidata-82afc354ee6179453e597e48404fec36760eb5ea-v18-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-wikidata-82afc354ee6179453e597e48404fec36760eb5ea-v18_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/apache/couchdb/releases/tag/3.4.3">"Release 3.4.3"</a>. 17 March 2025<span class="reference-accessdate">. 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Retrieved <span class="nowrap">7 January</span> 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=GitHub&rft.atitle=npm-registry-couchapp&rft.date=2015-06-17&rft_id=https%3A%2F%2Fgithub.com%2Fnpm%2Fnpm-registry-couchapp&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.erlang-factory.com/conference/London2009/speakers/endafarrell">CouchDB at the BBC as a fault tolerant, scalable, multi-data center key-value store</a></span> </li> <li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://mail-archives.apache.org/mod_mbox/couchdb-dev/200910.mbox/%3C4AD53996.3090104@canonical.com%3E">Email from Elliot Murphy (Canonical)</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110505005955/http://mail-archives.apache.org/mod_mbox/couchdb-dev/200910.mbox/%3C4AD53996.3090104@canonical.com%3E">Archived</a> 2011-05-05 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> to the CouchDB-Devel list</span> </li> <li id="cite_note-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-25">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://linux.slashdot.org/story/11/11/22/171228/canonical-drops-couchdb-from-ubuntu-one">Canonical Drops CouchDB From Ubuntu One (Slashdot)</a></span> </li> <li id="cite_note-26"><span class="mw-cite-backlink"><b><a href="#cite_ref-26">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://protogrid.com/bisc/de/001-about">"Protogrid - Über uns"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Protogrid+-+%C3%9Cber+uns&rft_id=http%3A%2F%2Fprotogrid.com%2Fbisc%2Fde%2F001-about&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></span> </li> <li id="cite_note-Apache,_View_Server-27"><span class="mw-cite-backlink"><b><a href="#cite_ref-Apache,_View_Server_27-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://wiki.apache.org/couchdb/ViewServer">View Server Documentation</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20081020160035/http://wiki.apache.org/couchdb/ViewServer">Archived</a> 2008-10-20 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> on wiki.apache.org</span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Bibliography">Bibliography</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=10" title="Edit section: Bibliography"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation cs2">Anderson, J. Chris; Slater, Noah; Lehnardt, Jan (November 15, 2009), <a rel="nofollow" class="external text" href="http://guide.couchdb.org/editions/1/en/index.html"><i>CouchDB: The Definitive Guide</i></a> (1st ed.), <a href="/wiki/O%27Reilly_Media" title="O'Reilly Media">O'Reilly Media</a>, p. 300, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-596-15816-3" title="Special:BookSources/978-0-596-15816-3"><bdi>978-0-596-15816-3</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=CouchDB%3A+The+Definitive+Guide&rft.pages=300&rft.edition=1st&rft.pub=O%27Reilly+Media&rft.date=2009-11-15&rft.isbn=978-0-596-15816-3&rft.aulast=Anderson&rft.aufirst=J.+Chris&rft.au=Slater%2C+Noah&rft.au=Lehnardt%2C+Jan&rft_id=http%3A%2F%2Fguide.couchdb.org%2Feditions%2F1%2Fen%2Findex.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation cs2">Lennon, Joe (December 15, 2009), <a rel="nofollow" class="external text" href="https://web.archive.org/web/20101205154416/http://apress.com/book/view/9781430272373"><i>Beginning CouchDB</i></a> (1st ed.), <a href="/wiki/Apress" class="mw-redirect" title="Apress">Apress</a>, p. 300, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4302-7237-3" title="Special:BookSources/978-1-4302-7237-3"><bdi>978-1-4302-7237-3</bdi></a>, archived from <a rel="nofollow" class="external text" href="http://www.apress.com/book/view/9781430272373">the original</a> on December 5, 2010<span class="reference-accessdate">, retrieved <span class="nowrap">November 1,</span> 2009</span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Beginning+CouchDB&rft.pages=300&rft.edition=1st&rft.pub=Apress&rft.date=2009-12-15&rft.isbn=978-1-4302-7237-3&rft.aulast=Lennon&rft.aufirst=Joe&rft_id=http%3A%2F%2Fwww.apress.com%2Fbook%2Fview%2F9781430272373&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation cs2">Holt, Bradley (March 7, 2011), <a rel="nofollow" class="external text" href="http://oreilly.com/catalog/0636920018247"><i>Writing and Querying MapReduce Views in CouchDB</i></a> (1st ed.), <a href="/wiki/O%27Reilly_Media" title="O'Reilly Media">O'Reilly Media</a>, p. 76, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4493-0312-9" title="Special:BookSources/978-1-4493-0312-9"><bdi>978-1-4493-0312-9</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Writing+and+Querying+MapReduce+Views+in+CouchDB&rft.pages=76&rft.edition=1st&rft.pub=O%27Reilly+Media&rft.date=2011-03-07&rft.isbn=978-1-4493-0312-9&rft.aulast=Holt&rft.aufirst=Bradley&rft_id=http%3A%2F%2Foreilly.com%2Fcatalog%2F0636920018247&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation cs2">Holt, Bradley (April 11, 2011), <a rel="nofollow" class="external text" href="http://oreilly.com/catalog/9781449303433"><i>Scaling CouchDB</i></a> (1st ed.), <a href="/wiki/O%27Reilly_Media" title="O'Reilly Media">O'Reilly Media</a>, p. 72, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4493-0343-3" title="Special:BookSources/978-1-4493-0343-3"><bdi>978-1-4493-0343-3</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Scaling+CouchDB&rft.pages=72&rft.edition=1st&rft.pub=O%27Reilly+Media&rft.date=2011-04-11&rft.isbn=978-1-4493-0343-3&rft.aulast=Holt&rft.aufirst=Bradley&rft_id=http%3A%2F%2Foreilly.com%2Fcatalog%2F9781449303433&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation cs2">Brown, MC (October 31, 2011), <a rel="nofollow" class="external text" href="http://oreilly.com/catalog/9781449307554"><i>Getting Started with CouchDB</i></a> (1st ed.), <a href="/wiki/O%27Reilly_Media" title="O'Reilly Media">O'Reilly Media</a>, p. 50, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4493-0755-4" title="Special:BookSources/978-1-4493-0755-4"><bdi>978-1-4493-0755-4</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Getting+Started+with+CouchDB&rft.pages=50&rft.edition=1st&rft.pub=O%27Reilly+Media&rft.date=2011-10-31&rft.isbn=978-1-4493-0755-4&rft.aulast=Brown&rft.aufirst=MC&rft_id=http%3A%2F%2Foreilly.com%2Fcatalog%2F9781449307554&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation cs2">Thompson, Mick (August 2, 2011), <a rel="nofollow" class="external text" href="http://oreilly.com/catalog/9781449307523"><i>Getting Started with GEO, CouchDB, and Node.js</i></a> (1st ed.), <a href="/wiki/O%27Reilly_Media" title="O'Reilly Media">O'Reilly Media</a>, p. 64, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4493-0752-3" title="Special:BookSources/978-1-4493-0752-3"><bdi>978-1-4493-0752-3</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Getting+Started+with+GEO%2C+CouchDB%2C+and+Node.js&rft.pages=64&rft.edition=1st&rft.pub=O%27Reilly+Media&rft.date=2011-08-02&rft.isbn=978-1-4493-0752-3&rft.aulast=Thompson&rft.aufirst=Mick&rft_id=http%3A%2F%2Foreilly.com%2Fcatalog%2F9781449307523&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Apache_CouchDB&action=edit&section=11" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="https://couchdb.apache.org">Official website</a></span></span></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20090831050402/http://books.couchdb.org/relax/">CouchDB: The Definitive Guide</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20160303172725/http://wiki.apache.org/couchdb/Complete_HTTP_API_Reference">Complete HTTP API Reference</a></li> <li><a rel="nofollow" class="external text" href="https://github.com/1999/couchdb-php">Simple PHP5 library to communicate with CouchDB</a></li> <li><a rel="nofollow" class="external text" href="https://code.google.com/p/async-couchdb-client/">Asynchronous CouchDB client for Java</a></li> <li><a rel="nofollow" class="external text" href="https://github.com/KimStebel/sprouch">Asynchronous CouchDB client for Scala</a></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFLehnardt2008" class="citation web cs1">Lehnardt, Jan (2008). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20121109191546/http://video.google.com/videoplay?docid=-3714560380544574985&hl=en">"Couch DB at 10,000 feet"</a>. <i>Erlang eXchange 2008</i>. Archived from <a rel="nofollow" class="external text" href="http://video.google.com/videoplay?docid=-3714560380544574985&hl=en">the original</a> on 9 November 2012<span class="reference-accessdate">. Retrieved <span class="nowrap">15 April</span> 2012</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Erlang+eXchange+2008&rft.atitle=Couch+DB+at+10%2C000+feet&rft.date=2008&rft.aulast=Lehnardt&rft.aufirst=Jan&rft_id=http%3A%2F%2Fvideo.google.com%2Fvideoplay%3Fdocid%3D-3714560380544574985%26hl%3Den&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFLenhardt2009" class="citation web cs1">Lenhardt, Jan (2009). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110619041527/http://www.erlang-factory.com/conference/London2009/speakers/janlehnardt">"CouchDB for Erlang Developers"</a>. <i>Erlang Factory London 2009</i>. Archived from <a rel="nofollow" class="external text" href="http://www.erlang-factory.com/conference/London2009/speakers/janlehnardt">the original</a> on 19 June 2011<span class="reference-accessdate">. Retrieved <span class="nowrap">15 April</span> 2012</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Erlang+Factory+London+2009&rft.atitle=CouchDB+for+Erlang+Developers&rft.date=2009&rft.aulast=Lenhardt&rft.aufirst=Jan&rft_id=http%3A%2F%2Fwww.erlang-factory.com%2Fconference%2FLondon2009%2Fspeakers%2Fjanlehnardt&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFKatz2009" class="citation web cs1">Katz, Damien (January 2009). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110427212129/http://www.infoq.com/presentations/katz-couchdb-and-me">"CouchDB and Me"</a>. <i>RubyFringe</i>. InfoQ. Archived from <a rel="nofollow" class="external text" href="http://www.infoq.com/presentations/katz-couchdb-and-me">the original</a> on 27 April 2011<span class="reference-accessdate">. Retrieved <span class="nowrap">15 April</span> 2012</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=RubyFringe&rft.atitle=CouchDB+and+Me&rft.date=2009-01&rft.aulast=Katz&rft.aufirst=Damien&rft_id=http%3A%2F%2Fwww.infoq.com%2Fpresentations%2Fkatz-couchdb-and-me&rfr_id=info%3Asid%2Fen.wikipedia.org%3AApache+CouchDB" class="Z3988"></span></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output 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href="/wiki/Apache_Allura" title="Apache Allura">Allura</a></li> <li><a href="/wiki/Apache_Ambari" class="mw-redirect" title="Apache Ambari">Ambari</a></li> <li><a href="/wiki/Apache_Ant" title="Apache Ant">Ant</a></li> <li><a href="/wiki/Apache_Aries" title="Apache Aries">Aries</a></li> <li><a href="/wiki/Apache_Arrow" title="Apache Arrow">Arrow</a></li> <li><a href="/wiki/Apache_HTTP_Server" title="Apache HTTP Server">Apache HTTP Server</a></li> <li><a href="/wiki/Apache_Portable_Runtime" title="Apache Portable Runtime">APR</a></li> <li><a href="/wiki/Apache_Avro" title="Apache Avro">Avro</a></li> <li><a href="/wiki/Apache_Axis" title="Apache Axis">Axis</a></li> <li><a href="/wiki/Apache_Axis2" title="Apache Axis2">Axis2</a></li> <li><a href="/wiki/Apache_Beam" title="Apache Beam">Beam</a></li> <li><a href="/wiki/Apache_Bloodhound" class="mw-redirect" title="Apache Bloodhound">Bloodhound</a></li> <li><a href="/wiki/Apache_Brooklyn" title="Apache Brooklyn">Brooklyn</a></li> <li><a href="/wiki/Apache_Calcite" title="Apache Calcite">Calcite</a></li> <li><a href="/wiki/Apache_Camel" title="Apache Camel">Camel</a></li> <li><a href="/wiki/Apache_CarbonData" title="Apache CarbonData">CarbonData</a></li> <li><a href="/wiki/Apache_Cassandra" title="Apache Cassandra">Cassandra</a></li> <li><a href="/wiki/Apache_Cayenne" title="Apache Cayenne">Cayenne</a></li> <li><a href="/wiki/Apache_CloudStack" title="Apache CloudStack">CloudStack</a></li> <li><a href="/wiki/Apache_Cocoon" title="Apache Cocoon">Cocoon</a></li> <li><a href="/wiki/Apache_Cordova" title="Apache Cordova">Cordova</a></li> <li><a class="mw-selflink selflink">CouchDB</a></li> <li><a href="/wiki/Apache_cTAKES" title="Apache cTAKES">cTAKES</a></li> <li><a href="/wiki/Apache_CXF" title="Apache CXF">CXF</a></li> <li><a href="/wiki/Apache_Derby" title="Apache Derby">Derby</a></li> <li><a href="/wiki/Apache_Directory" title="Apache Directory">Directory</a></li> <li><a href="/wiki/Apache_Drill" title="Apache Drill">Drill</a></li> <li><a href="/wiki/Apache_Druid" title="Apache Druid">Druid</a></li> <li><a href="/wiki/Apache_Empire-db" title="Apache Empire-db">Empire-db</a></li> <li><a href="/wiki/Apache_Felix" title="Apache Felix">Felix</a></li> <li><a href="/wiki/Apache_Flex" title="Apache Flex">Flex</a></li> <li><a href="/wiki/Apache_Flink" title="Apache Flink">Flink</a></li> <li><a href="/wiki/Apache_Flume" class="mw-redirect" title="Apache Flume">Flume</a></li> <li><a href="/wiki/FreeMarker" title="FreeMarker">FreeMarker</a></li> <li><a href="/wiki/Apache_Geronimo" title="Apache Geronimo">Geronimo</a></li> <li><a href="/wiki/Apache_Groovy" title="Apache Groovy">Groovy</a></li> <li><a href="/wiki/Apache_Guacamole" title="Apache Guacamole">Guacamole</a></li> <li>Gump</li> <li><a href="/wiki/Apache_Hadoop" title="Apache Hadoop">Hadoop</a></li> <li><a href="/wiki/Apache_HBase" title="Apache HBase">HBase</a></li> <li><a href="/wiki/Apache_Helix" title="Apache Helix">Helix</a></li> <li><a href="/wiki/Apache_Hive" title="Apache Hive">Hive</a></li> <li><a href="/wiki/Apache_Iceberg" title="Apache Iceberg">Iceberg</a></li> <li><a href="/wiki/Apache_Ignite" title="Apache Ignite">Ignite</a></li> <li><a href="/wiki/Apache_Impala" title="Apache Impala">Impala</a></li> <li><a href="/wiki/Apache_Jackrabbit" title="Apache Jackrabbit">Jackrabbit</a></li> <li><a href="/wiki/Apache_James" title="Apache James">James</a></li> <li><a href="/wiki/Apache_Jena" title="Apache Jena">Jena</a></li> <li><a href="/wiki/Apache_JMeter" title="Apache JMeter">JMeter</a></li> <li><a href="/wiki/Apache_Kafka" title="Apache Kafka">Kafka</a></li> <li><a href="/wiki/Apache_Kudu" title="Apache Kudu">Kudu</a></li> <li><a href="/wiki/Apache_Kylin" title="Apache Kylin">Kylin</a></li> <li><a href="/wiki/Apache_Lucene" title="Apache Lucene">Lucene</a></li> <li><a href="/wiki/Apache_Mahout" title="Apache Mahout">Mahout</a></li> <li><a href="/wiki/Apache_Maven" title="Apache Maven">Maven</a></li> <li><a href="/wiki/Apache_MINA" title="Apache MINA">MINA</a></li> <li><a href="/wiki/Mod_perl" title="Mod perl">mod_perl</a></li> <li><a href="/wiki/Apache_MyFaces" title="Apache MyFaces">MyFaces</a></li> <li><a href="/wiki/Apache_Mynewt" title="Apache Mynewt">Mynewt</a></li> <li><a href="/wiki/Apache_NiFi" title="Apache NiFi">NiFi</a></li> <li><a href="/wiki/NetBeans" title="NetBeans">NetBeans</a></li> <li><a href="/wiki/Apache_Nutch" title="Apache Nutch">Nutch</a></li> <li><a href="/wiki/NuttX" title="NuttX">NuttX</a></li> <li><a href="/wiki/Apache_OFBiz" title="Apache OFBiz">OFBiz</a></li> <li><a href="/wiki/Apache_Oozie" title="Apache Oozie">Oozie</a></li> <li><a href="/wiki/Apache_OpenEJB" title="Apache OpenEJB">OpenEJB</a></li> <li><a href="/wiki/Apache_OpenJPA" title="Apache OpenJPA">OpenJPA</a></li> <li><a href="/wiki/Apache_OpenNLP" title="Apache OpenNLP">OpenNLP</a></li> <li><a href="/wiki/Apache_OpenOffice" title="Apache OpenOffice">OрenOffice</a></li> <li><a href="/wiki/Apache_ORC" title="Apache ORC">ORC</a></li> <li><a href="/wiki/Apache_PDFBox" title="Apache PDFBox">PDFBox</a></li> <li><a href="/wiki/Apache_Parquet" title="Apache Parquet">Parquet</a></li> <li><a href="/wiki/Apache_Phoenix" title="Apache Phoenix">Phoenix</a></li> <li><a href="/wiki/Apache_POI" title="Apache POI">POI</a></li> <li><a href="/wiki/Apache_Pig" title="Apache Pig">Pig</a></li> <li><a href="/wiki/Apache_Pinot" title="Apache Pinot">Pinot</a></li> <li><a href="/wiki/Apache_Pivot" title="Apache Pivot">Pivot</a></li> <li><a href="/wiki/Apache_Qpid" title="Apache Qpid">Qpid</a></li> <li><a href="/wiki/Apache_Roller" title="Apache Roller">Roller</a></li> <li><a href="/wiki/Apache_RocketMQ" title="Apache RocketMQ">RocketMQ</a></li> <li><a href="/wiki/Apache_Samza" title="Apache Samza">Samza</a></li> <li><a href="/wiki/Apache_Shiro" title="Apache Shiro">Shiro</a></li> <li><a href="/wiki/Apache_SINGA" title="Apache SINGA">SINGA</a></li> <li><a href="/wiki/Apache_Sling" title="Apache Sling">Sling</a></li> <li><a href="/wiki/Apache_Solr" title="Apache Solr">Solr</a></li> <li><a href="/wiki/Apache_Spark" title="Apache Spark">Spark</a></li> <li><a href="/wiki/Apache_Storm" title="Apache Storm">Storm</a></li> <li><a href="/wiki/Apache_SpamAssassin" title="Apache SpamAssassin">SpamAssassin</a></li> <li><a href="/wiki/Apache_Struts" title="Apache Struts">Struts</a> <ul><li><a href="/wiki/Apache_Struts_1" title="Apache Struts 1">1</a></li></ul></li> <li><a href="/wiki/Apache_Subversion" title="Apache Subversion">Subversion</a></li> <li><a href="/wiki/Apache_Superset" title="Apache Superset">Superset</a></li> <li><a href="/wiki/Apache_SystemDS" title="Apache SystemDS">SystemDS</a></li> <li><a href="/wiki/Apache_Tapestry" title="Apache Tapestry">Tapestry</a></li> <li><a href="/wiki/Apache_Thrift" title="Apache Thrift">Thrift</a></li> <li><a href="/wiki/Apache_Tika" title="Apache Tika">Tika</a></li> <li><a href="/wiki/Apache_TinkerPop" class="mw-redirect" title="Apache TinkerPop">TinkerPop</a></li> <li><a href="/wiki/Apache_Tomcat" title="Apache Tomcat">Tomcat</a></li> <li><a href="/wiki/Apache_Trafodion" class="mw-redirect" title="Apache Trafodion">Trafodion</a></li> <li><a href="/wiki/Apache_Traffic_Server" title="Apache Traffic Server">Traffic Server</a></li> <li><a href="/wiki/UIMA" title="UIMA">UIMA</a></li> <li><a href="/wiki/Apache_Velocity" title="Apache Velocity">Velocity</a></li> <li><a href="/wiki/Apache_Wicket" title="Apache Wicket">Wicket</a></li> <li><a href="/wiki/Apache_Xalan" title="Apache Xalan">Xalan</a></li> <li><a href="/wiki/Apache_Xerces" title="Apache Xerces">Xerces</a></li> <li><a href="/wiki/Apache_XMLBeans" title="Apache XMLBeans">XMLBeans</a></li> <li>Yetus</li> <li><a href="/wiki/Apache_ZooKeeper" title="Apache ZooKeeper">ZooKeeper</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Apache_Commons" title="Apache Commons">Commons</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Byte_Code_Engineering_Library" title="Byte Code Engineering Library">BCEL</a></li> <li><a href="/wiki/Bean_Scripting_Framework" title="Bean Scripting Framework">BSF</a></li> <li><a href="/wiki/Commons_Daemon" title="Commons Daemon">Daemon</a></li> <li><a href="/wiki/Apache_Jelly" title="Apache Jelly">Jelly</a></li> <li><a href="/wiki/Apache_Commons_Logging" title="Apache Commons Logging">Logging</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Incubator</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Apache_Taverna" title="Apache Taverna">Taverna</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other projects</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Apache_Batik" title="Apache Batik">Batik</a></li> <li><a href="/wiki/Apache_FOP_(Formatting_Objects_Processor)" class="mw-redirect" title="Apache FOP (Formatting Objects Processor)">FOP</a></li> <li><a href="/wiki/Apache_Ivy" title="Apache Ivy">Ivy</a></li> <li><a href="/wiki/Log4j" title="Log4j">Log4j</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Attic</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Apache_Apex" title="Apache Apex">Apex</a></li> <li><a href="/wiki/AxKit" title="AxKit">AxKit</a></li> <li><a href="/wiki/Apache_Beehive" title="Apache Beehive">Beehive</a></li> <li><a href="/wiki/Apache_iBATIS" title="Apache iBATIS">iBATIS</a></li> <li><a href="/wiki/Apache_Click" title="Apache Click">Click</a></li> <li><a href="/wiki/Apache_Continuum" title="Apache Continuum">Continuum</a></li> <li><a href="/wiki/Deltacloud" title="Deltacloud">Deltacloud</a></li> <li><a href="/wiki/Etch_(protocol)" title="Etch (protocol)">Etch</a></li> <li><a href="/wiki/Apache_Giraph" title="Apache Giraph">Giraph</a></li> <li><a href="/wiki/Apache_Hama" title="Apache Hama">Hama</a></li> <li><a href="/wiki/Apache_Harmony" title="Apache Harmony">Harmony</a></li> <li><a href="/wiki/Jakarta_Project" title="Jakarta Project">Jakarta</a></li> <li><a href="/wiki/Apache_Marmotta" title="Apache Marmotta">Marmotta</a></li> <li><a href="/wiki/Apache_MXNet" title="Apache MXNet">MXNet</a></li> <li><a href="/wiki/Apache_ODE" title="Apache ODE">ODE</a></li> <li><a href="/wiki/Jini" title="Jini">River</a></li> <li><a href="/wiki/Apache_Shale" title="Apache Shale">Shale</a></li> <li><a href="/wiki/Jakarta_Slide" class="mw-redirect" title="Jakarta Slide">Slide</a></li> <li><a href="/wiki/Sqoop" title="Sqoop">Sqoop</a></li> <li><a href="/wiki/Apache_Stanbol" title="Apache Stanbol">Stanbol</a></li> <li><a href="/wiki/Apache_Tuscany" class="mw-redirect" title="Apache Tuscany">Tuscany</a></li> <li><a href="/wiki/Apache_Wave" class="mw-redirect" title="Apache Wave">Wave</a></li> <li><a href="/wiki/Apache_XML" title="Apache XML">XML</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Licenses</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Apache_License" title="Apache License">Apache License</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" 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control">Authority control databases</a>: National <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q1136882#identifiers" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" 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