Recent Improvements to Crossref’s Metadata Search (

We have made some improvements to Crossref’s Metadata Search service ( If you are a regular user of Metadata Search, the main change in behaviour you should notice is an uptick in the speed of the service, as most of the changes we have made are “under the hood”.

If you are not a regular user, this is your chance to learn something new:

Metadata Search is one of the services we have purpose-built for humans rather than machine interfaces. It allows you to search among all the records included in our REST API and is especially useful for broader searches of the literature or for locating a work whose DOI you do not know. Signing in to your ORCID account on Metadata Search also allows you to manually add search results to your ORCID record.

The changes we have deployed today include the following:

  • The backend logic has been rewritten in Python to make it more scalable and easier to maintain.
  • With the exception of the funder search, Metadata Search now uses the query.bibliographic parameter in sending user queries to the REST API, which returns more accurate results faster and more efficiently.
  • Clicking on the DOI for a search result now opens the corresponding landing page in a new browser tab.
  • The “Add to ORCID” Search & Link wizard has been updated to integrate with version 3.0 of the ORCID API. This has also addressed some legacy issues with the mapping of content types and users being unable to add certain works to their ORCID records.

Aside from these improvements, we are now also able to plan out future tweaks and new features, including:

  • Re-introducing search facets or filters (see this thread for more background on why faceted search was disabled in March 2023).
  • Exposing the subtitles of works in the search results.

Stay tuned for updates on these as we continue to improve the Metadata Search service!