About this API
The Federal Register is the daily journal of the U.S. federal government — it publishes rules, notices and executive actions. Its keyless REST API exposes documents and their metadata in JSON, with filtering by date, agency and type. It is a good source for legal queries (GEO/AEO), analogous to the EU's EUR-Lex.
Frequently asked questions
Do I need an API key?
No, the API is public and free — no registration, no key required.
What data does this API return?
U.S. Federal Register documents — rules, notices, executive actions — with metadata, in JSON. Filterable by date, agency and type.
Can this API be called directly from a browser?
Yes — the API returns a CORS header allowing calls from any domain, so it works directly from frontend code (hence the live "Try it" button above).
Who runs this API?
The U.S. National Archives (Office of the Federal Register). Documentation: federalregister.gov/developers.