The Crossref Curriculum

DOI-to-metadata query

Metadata may be retrieved in JSON format using our REST API, or in XML format as documented below.

Most DOI-to-metadata queries are done via HTTPS using synchronous HTTPS queries, but may also be submitted as asynchronous batch queries.

Example HTTPS queries

https://doi.crossref.org/search/doi?pid={username:password}&format=unixsd&doi=DOI
https://doi.crossref.org/servlet/query?pid={myemail@crossref.org}&format=unixref&id=DOI

OpenURL query

Crossref supports DOI queries formatted as OpenURL version 0.1 requests. For complete metadata (UNIXREF) include the format="unixref" parameter.

https://www.crossref.org/openurl/?pid={myemail@crossref.org}&format=unixref&id=doi:10.1577/H02-043&noredirect=true

Query results: xsd_xml format (default)

<crossref_result version="2.0" xsi:schemaLocation="https://www.crossref.org/qrschema/2.0 https://www.crossref.org/schema/queryResultSchema/crossref_query_output2.0.xsd" xmlns="https://www.crossref.org/qrschema/2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <query_result>
<head>
<doi_batch_id>none</doi_batch_id>
</head>
<body>
<query status="resolved" fl_count="6">
<doi type="journal_article">10.1577/H02-043</doi>
<issn type="print">0899-7659</issn>
<issn type="electronic">1548-8667</issn>
<journal_title>Journal of Aquatic Animal Health</journal_title>
<contributors>
<contributor sequence="first" contributor_role="author">
<given_name>John P.</given_name>
<surname>Hawke</surname>
</contributor>
<contributor sequence="additional" contributor_role="author">
<given_name>Ronald L.</given_name>
<surname>Thune</surname>
</contributor>
<contributor sequence="additional" contributor_role="author">
<given_name>Richard K.</given_name>
<surname>Cooper</surname>
</contributor>
<contributor sequence="additional" contributor_role="author">
<given_name>Erika</given_name>
<surname>Judice</surname>
</contributor>
<contributor sequence="additional" contributor_role="author">
<given_name>Maria</given_name>
<surname>Kelly-Smith</surname>
</contributor>
</contributors>
<volume>15</volume>
<issue>3</issue>
<first_page>189</first_page>
<last_page>201</last_page>
<year media_type="print">2003</year>
<publication_type>full_text</publication_type>
<article_title>Molecular and Phenotypic Characterization of Strains ofPhotobacterium damselaesubsp.piscicidaIsolated from Hybrid Striped Bass Cultured in Louisiana, USA</article_title>
</query>
</body>
</query_result>
</crossref_result>

Query results: UNIXREF format

<doi_records>
<doi_record owner="10.1080" timestamp="2011-12-08 13:28:43">
<crossref>
<journal>
<journal_metadata language="en">
<full_title>Journal of Aquatic Animal Health</full_title>
<abbrev_title>Journal of Aquatic Animal Health</abbrev_title>
<issn media_type="print">0899-7659</issn>
<issn media_type="electronic">1548-8667</issn>
</journal_metadata>
<journal_issue>
<publication_date media_type="print">
<month>09</month>
<year>2003</year>
</publication_date>
<journal_volume>
<volume>15</volume>
</journal_volume>
<issue>3</issue>
</journal_issue>
<journal_article publication_type="full_text">
<titles>
<title>Molecular and Phenotypic Characterization of Strains of <i>Photobacterium damselae</i>subsp. <i>piscicida</i> Isolated from Hybrid Striped Bass Cultured in Louisiana, USA</title>
</titles>
<contributors>
<person_name sequence="first" contributor_role="author">
<given_name>John P.</given_name>
<surname>Hawke</surname>
</person_name>
<person_name sequence="additional" contributor_role="author">
<given_name>Ronald L.</given_name>
<surname>Thune</surname>
</person_name>
<person_name sequence="additional" contributor_role="author">
<given_name>Richard K.</given_name>
<surname>Cooper</surname>
</person_name>
<person_name sequence="additional" contributor_role="author">
<given_name>Erika</given_name>
<surname>Judice</surname>
</person_name>
<person_name sequence="additional" contributor_role="author">
<given_name>Maria</given_name>
<surname>Kelly-Smith</surname>
</person_name>
</contributors>
<publication_date media_type="print">
<month>09</month>
<year>2003</year>
</publication_date>
<pages>
<first_page>189</first_page>
<last_page>201</last_page>
</pages>
<publisher_item>
<item_number item_number_type="sequence-number">1</item_number>
<identifier id_type="doi">10.1577/H02-043</identifier>
</publisher_item>
<doi_data>
<doi>10.1577/H02-043</doi>
<resource>http://www.tandfonline.com/doi/abs/10.1577/H02-043</resource>
</doi_data>
</journal_article>
</journal>
</crossref>
</doi_record>
</doi_records>

DOI-to-metadata XML batch query

DOI-to-metadata queries can also be performed using XML, allowing the use of control features available only with XML queries.

Example XML query

<?xml version = "1.0" encoding="UTF-8"?>
<query_batch version="2.0" xmlns = "https://www.crossref.org/qschema/2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <head>
      <email_address>support@crossref.org</email_address>
      <doi_batch_id>Sample multi resolve</doi_batch_id>
  </head>
  <body>
       <query key="mykey" expanded-results="true">
           <doi>10.1006/jmbi.2000.4282</doi>
       </query>
   </body>
</query_batch>

Last Updated: 2020 April 8 by Laura J. Wilkinson