omnischolar / crossref

1.x-dev 2026-10-17 13:45 UTC

Requires

• php: >=8.2
• omniscient/omnischolar: ^1.0@dev
• symfony/http-client: ^6.4|^7.0|^8.0

Requires (Dev)

• phpunit/phpunit: ^11.0

MIT

• Marco Meyer

• metadata
• doi
• crossref
• publications
• scholarly
• omnischolar

Published on Packagist.org on 2026-10-17 13:54 UTC

README

Crossref for omniscient/omnischolar: the reference metadata of any work with a Crossref DOI - title, authors and their ORCIDs, journal or book, volume, pages, publisher, ISBNs, licence, the citation count Crossref knows - the works deposited with an ORCID, the works signed with a name, a bibliographic search. No key; with a mailto, the calls go to Crossref's polite pool.

$crossref = (new CrossrefSourceFactory($http))->create(['mailto' => '[e-mail]']);
$crossref->work('10.1039/d4sc04973j');
$crossref->works('0000-0002-9127-1687');       // deposited with that ORCID
$crossref->works('Monica Neagoy');             // signed with that name

omnischolar:
    sources:
        crossref: { factory: crossref, options: { mailto: '[e-mail]' } }

The client is written directly on Symfony's HttpClient: the API is plain JSON, and a client library (renanbr/crossref-client) would add a dependency without removing code.

See docs/.

Responsibility

This package is an independent, unofficial client: it is not affiliated with, endorsed by or sponsored by Crossref. It reaches their service on behalf of whoever runs it, and it does not redistribute their data beyond the short excerpts recorded as test fixtures. Its MIT licence covers this package's code only and grants no right to the service or to its data.

Whoever installs and runs this package is responsible for complying with the Crossref REST API's terms (REST API documentation), for obtaining whatever they require (an account, a key, a licence or subscription, an attribution or a citation, a rate limit to respect), and for any use made of what it returns. The authors publish it free of charge, make no commercial use of it, and accept no liability for how it is used (see LICENSE).

License: MIT since 2026-10-09; earlier versions remain published under LGPL-3.0-or-later.