Developer API

Legal Corpus API for legislation, court decisions, circulars, and doctrine

Omnilex exposes a programmable search surface for the legal corpus with stable identifiers, grouped JSON responses, and citation-friendly metadata.

Search CorpusSwagger UIOpenAPI JSONllms.txt

Overview

One endpoint for legal corpus discovery.

  • Search primary law, court decisions, and legal commentary with one request.
  • Filter by jurisdiction, region, court, legal area, article, citation, language, and date.
  • Return JSON that is suitable for citations, links, internal tools, and LLM workflows.

Coverage

law

Legislation

Acts, codes, regulations, and other primary legal texts.

article

Legislation articles

Article-level records for targeted legal provision search.

court_decision

Court decisions

Judgments and case law with citations, dates, courts, and source links.

commentary

Legal doctrine and commentary

Commentary and doctrine linked to legal sources where available.

Capabilities

Structured retrieval

  • Source type filters for laws, articles, decisions, and commentary.
  • Jurisdiction and region filters for federal and regional material.
  • Court, chamber, legal area, outcome, citation, and date filters where available.

Machine-readable output

  • Grouped JSON responses by source family.
  • Stable IDs, titles, summaries, citations, source URLs, and language metadata.
  • OpenAPI, Swagger UI, llms.txt, and sitemap support for easier discovery.

Playground

Choose one of three examples or build your own query.

Source types
Advanced filters

Generated request

GET https://api.omnilex.ai/sources/search?query=employment+termination&jurisdiction=ch&region=federal&sourceTypes=law%2Carticle%2Ccourt_decision%2Ccommentary&limit=5&includeTotal=true

Filters

Legal metadata for reproducible API queries.

querysearchModejurisdictionregionsourceTypeslanguagepreferredLanguagedocumentTypestatusnumberarticleNumbercitationcourtchamberdocketNumberlegalAreadecisionTypelegalForceprocedureTypeoutcomedecisionDateFromdecisionDateTopublicationDateFrompublicationDateTolimitoffsetincludeTotal

Use cases

Court Decision Search

Search judgments and case law by citation, court, chamber, legal area, date, language, and region.

Legislation Search

Find acts, codes, regulations, and article-level provisions by jurisdiction, region, number, article, status, and language.

Semantic Source Search

Use vector similarity for legislation, legislation articles, and court decisions when the wording differs from the exact legal text.

Circulars and Directives Search

Surface circulars, directives, and administrative legal materials when they are available in the indexed source catalog.

Legal Doctrine and Commentary

Search commentary and doctrine alongside primary legal sources to connect analysis with cited legislation and decisions.

Search by Court, Region, and Legal Area

Combine structured filters such as jurisdiction, region, court, chamber, legal area, outcome, language, and date ranges.

Latest Legal Sources

Use publication and decision date filters to retrieve recently updated legislation, decisions, commentary, and legal documents.