Once a year we release all metadata records for content registered with Crossref in a public data file. This year’s version, containing nearly 180 million records, is now available. It includes metadata associated with all Crossref-registered DOIs in JSON-lines format.
Crossref Ambassadors act as local points of contact, meeting editors, librarians, researchers, and institutions to help them navigate Crossref services and understand how strong metadata supports visibility, integrity, and trust in research. They explain how to participate in our rich network of connections between works, people, and institutions, in ways that make sense in their own contexts. And last year, being our 25th anniversary, Ambassadors also massively contributed to our celebrations!
We have renewed our partnership with DOAJ to focus on a new set of objectives that reflect both organisations’ commitment to improving sustainable and equitable services and infrastructure. This renewed collaboration focuses on improving the quality of scholarly metadata while expanding support for journals in low- and middle income- countries.
We have worked together since 2021, primarily to encourage the dissemination and use of scholarly research using online technologies, and regional and international networks, partners and communities. This partnership has helped to build local institutional capacity and sustainability within the global scholarly communication ecosystem. A continued partnership also reflects that we have a shared community; currently almost 90% of DOAJ journals are represented in Crossref.
With key milestones achieved in 2025, including the appointment of new Directors of Technology and Programs, a move to the cloud, and some key schema updates, we now have a firm foundation for our next challenge: a redesign of our core technical systems to make them more modern, robust, and easier to maintain and scale.
Continuing our blog series highlighting the uses of Crossref metadata, we talked to David Sommer, co-founder and Product Director at the research dissemination management service, Kudos. David tells us how Kudos is collaborating with Crossref, and how they use the REST API as part of our Metadata Plus service.
Introducing Kudos
At Kudos we know that effective dissemination is the starting point for impact. Kudos is a platform that allows researchers and research groups to plan, manage, measure, and report on dissemination activities to help maximize the visibility and impact of their work.
We launched the service in 2015 and now work with almost 100 publishers and institutions around the world, and have nearly 250,000 researchers using the platform.
We provide guidance to researchers on writing a plain language summary about their work so it can be found and understood by a broad range of audiences, and then we support researchers in disseminating across multiple channels and measuring which dissemination activities are most effective for them.
As part of this, we developed the Sharable-PDF to allow researchers to legitimately share publication profiles across a range of sites and networks, and track the impact of their work centrally. This also allows publishers to prevent copyright infringement, and reclaim lost usage from sharing of research articles on scholarly collaboration networks.
An example of a Kudos publication page showing the plain language summary
How is Crossref metadata used in Kudos?
Since our launch, Crossref has been our metadata foundation. When we receive notification from our publishing partners that an article, book or book chapter has been published, we query using the Crossref REST API to retrieve the metadata for that publication. That data allows us to populate the Kudos publication page.
We also integrate earlier in the researcher workflow, interfacing with all of the major Manuscript Submission Systems to support authors who want to build impact from the point of submission.
More recently, we started using the Crossref REST API to retrieve citation counts for a DOI. This enables us to include the number of times content is cited as part of the ‘basket of metrics’ we provide to our researchers. They can then understand the performance of their publications in context, and see the correlation between actions and results.
A Kudos metrics page, showing the basket of metrics and the correlation between actions and results
What are the future plans for Kudos?
We have exciting plans for the future! We are developing Kudos for Research Groups to support the planning, managing, measuring and reporting of dissemination activities for research groups, labs and departments. We are adding a range of new features and dissemination channels to support this, and to help researchers to better understand how their research is being used, and by whom.
What else would Kudos like to see in Crossref metadata?
We have always found Crossref to be very responsive and open to new ideas, so we look forward to continuing to work together. We are keen to see an industry standard article-level subject classification system developed, and it would seem that Crossref is the natural home for this.
We are also continuing to monitor Crossref Event Data which has the potential to provide a rich source of events that could be used to help demonstrate dissemination and impact.
Finally, we are pleased to see the work Crossref are doing to help improve the quality of the metadata and supporting publishers in auditing their data. If we could have anything we wanted, our dream would be to prevent “funny characters” in DOIs that cause us all kinds of escape character headaches!
Thank you David. If you would like to contribute a case study on the uses of Crossref Metadata APIs please contact the Community team.