eCFR

eCFR Search API

Full-text search across all Code of Federal Regulations content, with support for filtering by title, agency, date ranges, and content type. Returns ranked results with hierarchical context and full-text excerpts.

GitHub OpenAPI

Documentation

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Documentation
https://www.ecfr.gov/developers/documentation/api/v1

Specifications

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OpenAPI
https://raw.githubusercontent.com/api-evangelist/ecfr/refs/heads/main/openapi/ecfr-openapi.json

OpenAPI Specification

ecfr-openapi.json Raw ↑