Full-text search of U.S. case law / court opinions (CourtListener type=o). Returns the top matching page (up to limit) with case name, court, date filed, citations, docket number, a snippet, citation count, and a link. Works without a token; set COURTLISTENER_API_TOKEN for a higher rate limit.

Search court dockets (CourtListener type=r) by case name, free text, and/or docket number, optionally scoped to a court. Returns case name, court, docket number, filed/terminated dates, nature of suit, and a link. Works without a token.

List CourtListener courts and their ids (the values used as the court filter in opinion_search / docket_lookup). Optionally filter by jurisdiction code and/or a name substring. Jurisdiction codes include "F" (federal appellate/other), "FD" (federal district), "FB" (bankruptcy), "S" (state), "SA" (state appellate), "SS" (state supreme). Works without a token.

Fetch a full case by id: a cluster (the case: name, citations, date, judges, and its opinion ids) or a single opinion (its full text). Requires COURTLISTENER_API_TOKEN (these endpoints are authentication-only). Use the cluster_id from opinion_search results.

Verify legal citations against CourtListener's database of real cases before relying on them; catches fabricated or mangled citations. Pass free text (a brief, memo, or draft) or a single citation string; every citation recognized in the text is checked. Per citation: FOUND (with case name, date, and link) or an explicit NOT_FOUND / UNKNOWN_REPORTER flag. Requires COURTLISTENER_API_TOKEN (authentication-only endpoint). Caps: 64000 characters of text and 250 citations per call (server rate limit: 60 citations/min).

Every opinion that CITES a given opinion — the free version of a citator check ('is this case still being relied on, and by whom'). Pass an opinion id (from case_detail's sub_opinion_ids, or an opinion_search hit's cluster via case_detail). Returns citing opinions newest-first or most-cited-first with the same fields as opinion_search. Works without a token. NOTE: this reports who cites the case; it does NOT classify the treatment (followed/distinguished/overruled) — read the citing opinions.

The reverse of cited_by: every authority a given opinion RELIES ON (its table of authorities), with a depth count of how many times each is cited. Pass the citing opinion's id. Requires COURTLISTENER_API_TOKEN (authentication-only endpoint). Returns cited opinion ids; fetch interesting ones with case_detail (type opinion) or their clusters.

The actual filing history of a federal docket from the RECAP archive: numbered entries, dates, descriptions, and any archived PACER documents (with page counts and availability). Pass a docket_id from docket_lookup. Requires COURTLISTENER_API_TOKEN (authentication-only endpoint). Coverage note: RECAP holds what its users have bought from PACER — an entry or document not present may still exist on PACER.

Search oral-argument audio recordings (CourtListener type=oa): case name, court, argue date, judges on the panel, duration, and an MP3 download link. Useful for hearing how an issue was actually argued. Works without a token.

Look up judges / people in CourtListener's judiciary database (type via /people/) by last and/or first name. Returns id, assembled name, birth/death dates and place, gender, and how many positions are on file. Works without a token.