Library of Congress items API

openapi: 3.0.3
info:
  description: 'Congress.gov shares its application programming interface (API) with the public to ingest the Congressional data. <a href="sign-up/" target="_blank">Sign up for an API key</a> from api.data.gov that you can use to access web services provided by Congress.gov. To learn more, view our <a href="https://github.com/LibraryOfCongress/api.congress.gov/" target="_blank">GitHub repository</a>.

    '
  title: Congress.gov amendments items API
  version: '3'
servers:
- url: /v3
security:
- ApiKeyAuth: []
tags:
- name: items
  description: Access individual item details
paths:
  /item/{itemId}/:
    get:
      tags:
      - items
      summary: Get item details
      description: 'Returns bibliographic information and digital resources for a single item identified by its identifier. The item ID can be obtained from the id field in search results. Many items are composed of one or more resources; the item endpoint provides summary information about each resource and how to access it.

        '
      operationId: getItem
      parameters:
      - name: itemId
        in: path
        description: The item identifier (from the id field in search results, excluding the base URL)
        required: true
        schema:
          type: string
        example: 2003623100
      - name: fo
        in: query
        description: Output format
        required: false
        schema:
          type: string
          enum:
          - json
          - yaml
        example: json
      - name: at
        in: query
        description: Limit response to specific attribute(s)
        required: false
        schema:
          type: string
      responses:
        '200':
          description: Item bibliographic data and digital resources
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ItemResponse'
        '404':
          description: Item not found
components:
  schemas:
    ResourceFile:
      type: object
      description: A specific digital file for a resource
      properties:
        height:
          type: integer
          description: Height of the image in pixels
        levels:
          type: integer
          description: Number of zoom levels available
        mimetype:
          type: string
          description: MIME type of the file
        size:
          type: integer
          description: File size in bytes
        url:
          type: string
          description: URL to access the file
        width:
          type: integer
          description: Width of the image in pixels
    Resource:
      type: object
      description: A discrete digital representation or element of a collection item
      properties:
        caption:
          type: string
          description: Caption for the resource
        files:
          type: array
          description: Digital files associated with the resource
          items:
            type: array
            items:
              $ref: '#/components/schemas/ResourceFile'
        image:
          type: string
          description: URL of the resource image
        url:
          type: string
          description: URL of the resource
    ItemResponse:
      type: object
      description: Detailed item response from the loc.gov item endpoint
      properties:
        cite_this:
          type: object
          description: 'Experimental feature providing citation text in Chicago Manual of Style, MLA, and APA formats. Should be used as a starting point only.

            '
          additionalProperties: true
        item:
          type: object
          description: Bibliographic information for the requested item
          additionalProperties: true
        resources:
          type: array
          description: 'Digital resources associated with the item (digitized images, audio files, video files, web archive links, etc.)

            '
          items:
            $ref: '#/components/schemas/Resource'
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: query
      name: api_key