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Query US Code of Federal Regulations via eCFR API (agencies, search, structure, XML)
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| name | dtge-query-ecfr |
| description | Query US Code of Federal Regulations via eCFR API (agencies, search, structure, XML) |
Base URL: https://www.ecfr.gov
Returns all agencies with their CFR references.
Parameters: None
Response fields: name, short_name, display_name, sortable_name, slug, children[], cfr_references[{title, chapter}]
Returns all eCFR corrections.
Parameters:
| Name | Type | Description |
|---|---|---|
| date | string (query) | Restricts to corrections on/before this date AND corrected on/after. Format: YYYY-MM-DD |
| title | string (query) | Title number: '1', '2', '50', etc |
| error_corrected_date | string (query) | Only corrections corrected on this date. Format: YYYY-MM-DD |
Response fields: ecfr_corrections[{id, cfr_references[], corrective_action, error_corrected, error_occurred, fr_citation, position, display_in_toc, title, year, last_modified}]
Returns corrections for a specific title.
Parameters:
| Name | Type | Required | Description |
|---|---|---|---|
| title | string (path) | Yes | Title number: '1', '2', '50', etc |
All search endpoints share these common parameters:
| Name | Type | Description |
|---|---|---|
| query | string (query) | Search term; searches headings and full text |
| agency_slugs[] | array[string] (query) | Limit to agencies (get slugs from agencies endpoint) |
| date | string (query) | Limit to content present on this date (YYYY-MM-DD) |
| last_modified_after | string (query) | Content modified after this date (YYYY-MM-DD) |
| last_modified_on_or_after | string (query) | Content modified on or after this date (YYYY-MM-DD) |
| last_modified_before | string (query) | Content modified before this date (YYYY-MM-DD) |
| last_modified_on_or_before | string (query) | Content modified on or before this date (YYYY-MM-DD) |
Search results with pagination.
Additional parameters:
| Name | Type | Description |
|---|---|---|
| per_page | integer (query) | Results per page (max 1000) |
| page | integer (query) | Page number (can't paginate beyond 10,000 total results) |
| order | string (query) | Order of results |
| paginate_by | string (query) | 'date' groups results by date on same page (requires last_modified_* param) |
Response: {results[], meta: {description, current_page, total_count, total_pages, max_score, min_date, max_date}}
Returns count of matching results.
Returns search summary details.
Returns result counts grouped by date.
Returns result counts grouped by CFR title.
Returns result counts grouped by hierarchy level.
Returns search suggestions/autocomplete.
Summary information about each title.
Parameters: None
Response: {titles[{number, name, latest_amended_on, latest_issue_date, up_to_date_as_of, reserved, processing_in_progress?}], meta: {date, import_in_progress}}
Complete structure of a title as JSON (no content, just hierarchy).
Parameters:
| Name | Type | Required | Description |
|---|---|---|---|
| date | string (path) | Yes | YYYY-MM-DD (use 'current' for latest) |
| title | string (path) | Yes | Title number: '1', '2', '50', etc |
Response: Nested structure with {type, label, label_level, label_description, identifier, reserved?, children[], section_range?}
Source XML for a title or subset. Returns downloadable XML for full titles, processed XML for subsets.
Parameters:
| Name | Type | Required | Description |
|---|---|---|---|
| date | string (path) | Yes | YYYY-MM-DD |
| title | string (path) | Yes | Title number: '1', '2', '50', etc |
| subtitle | string (query) | No | Uppercase letter: 'A', 'B', 'C' |
| chapter | string (query) | No | Roman numerals or digits: 'I', 'X', '1' |
| subchapter | string (query) | No | Requires chapter. Uppercase letters: 'A', 'B', 'I' |
| part | string (query) | No | Part identifier |
| subpart | string (query) | No | Requires part. Generally uppercase letter: 'A', 'B', 'C' |
| section | string (query) | No | Requires part. Format: '121.1', '13.4', '1.9' |
| appendix | string (query) | No | Requires subtitle, chapter, or part. Formats: 'A', 'III', 'App. A' |
Returns complete hierarchy path from leaf node to title root.
Parameters: Same as full XML endpoint above.
Response: Array of ancestors from title down to requested node, each with {type, label, label_level, label_description, identifier, reserved?, section_range?}
Returns all sections and appendices in a title with version history.
Parameters:
| Name | Type | Required | Description |
|---|---|---|---|
| title | string (path) | Yes | Title number: '1', '2', '50', etc |
| issue_date[on] | string (query) | No | Content added on this issue date |
| issue_date[lte] | string (query) | No | Content added on or before this date |
| issue_date[gte] | string (query) | No | Content added on or after this date |
| subtitle | string (query) | No | Uppercase letter: 'A', 'B', 'C' |
| chapter | string (query) | No | Roman numerals or digits: 'I', 'X', '1' |
| subchapter | string (query) | No | Requires chapter. |
| part | string (query) | No | Part identifier |
| subpart | string (query) | No | Requires part. |
| section | string (query) | No | Requires part. |
| appendix | string (query) | No | Requires subtitle, chapter, or part. |
Response: {content_versions[{date, amendment_date, issue_date, identifier, name, part, substantive, removed, subpart, title, type}], meta: {title, result_count, issue_date, latest_amendment_date, latest_issue_date}}
Error codes: 400 (bad request with message), 503 (title being processed, check Retry-After header)
| # | Subject |
|---|---|
| 1 | General Provisions |
| 2 | Federal Financial Assistance |
| 3 | The President |
| 7 | Agriculture |
| 10 | Energy |
| 12 | Banks and Banking |
| 14 | Aeronautics and Space |
| 17 | Commodity and Securities Exchanges |
| 20 | Employees' Benefits |
| 21 | Food and Drugs |
| 26 | Internal Revenue |
| 29 | Labor |
| 40 | Protection of Environment |
| 42 | Public Health |
| 45 | Public Welfare |
| 47 | Telecommunication |
| 49 | Transportation |
| 50 | Wildlife and Fisheries |
subchapter requires chaptersubpart requires partsection requires partappendix requires subtitle, chapter, or part