Crossref REST API

The Crossref REST API is a public, read-only metadata API that provides programmatic access to Crossref's database of scholarly content. Endpoints expose works, journals, members, funders, types, licenses, prefixes, and DOI registration agency lookups, with rich query, filter, facet, sort, select, and cursor-based deep paging capabilities. No sign-up is required, but consumers are encouraged to use the polite pool by including a mailto query parameter or User-Agent contact for higher reliability.