Library of Congress member 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 member API
  version: '3'
servers:
- url: /v3
security:
- ApiKeyAuth: []
tags:
- name: member
  description: Returns member data from the API
paths:
  /member:
    get:
      tags:
      - member
      summary: Returns a list of congressional members.
      description: Returns a list of congressional members.
      parameters:
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/offset'
      - $ref: '#/components/parameters/limit'
      - $ref: '#/components/parameters/fromDateTime'
      - $ref: '#/components/parameters/toDateTime'
      - $ref: '#/components/parameters/currentMember'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Members'
            application/xml:
              schema:
                $ref: '#/components/schemas/Members'
        '400':
          description: Invalid status value
  /member/{bioguideId}:
    get:
      tags:
      - member
      summary: Returns detailed information for a specified congressional member.
      description: Returns detailed information for a specified congressional member.
      parameters:
      - $ref: '#/components/parameters/bioguideId'
      - $ref: '#/components/parameters/format'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Member'
            application/xml:
              schema:
                $ref: '#/components/schemas/Member'
        '400':
          description: Invalid status value
  /member/{bioguideId}/sponsored-legislation:
    get:
      tags:
      - member
      summary: Returns the list of legislation sponsored by a specified congressional member.
      description: Returns the list of legislation sponsored by a specified congressional member.
      parameters:
      - $ref: '#/components/parameters/bioguideId'
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/offset'
      - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MemberSponsoredLegislation'
            application/xml:
              schema:
                $ref: '#/components/schemas/MemberSponsoredLegislation'
        '400':
          description: Invalid status value
  /member/{bioguideId}/cosponsored-legislation:
    get:
      tags:
      - member
      summary: Returns the list of legislation cosponsored by a specified congressional member.
      description: Returns the list of legislation cosponsored by a specified congressional member.
      parameters:
      - $ref: '#/components/parameters/bioguideId'
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/offset'
      - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MemberSponsoredLegislation'
            application/xml:
              schema:
                $ref: '#/components/schemas/MemberSponsoredLegislation'
        '400':
          description: Invalid status value
  /member/congress/{congress}:
    get:
      tags:
      - member
      summary: Returns the list of members specified by Congress.
      description: Returns the list of members specified by Congress.
      parameters:
      - $ref: '#/components/parameters/congress'
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/offset'
      - $ref: '#/components/parameters/limit'
      - $ref: '#/components/parameters/currentMember'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Members'
            application/xml:
              schema:
                $ref: '#/components/schemas/Members'
        '400':
          description: Invalid status value
  /member/{stateCode}:
    get:
      tags:
      - member
      summary: Returns a list of members filtered by state.
      description: Returns a list of members filtered by state.
      parameters:
      - $ref: '#/components/parameters/stateCode'
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/limit'
      - $ref: '#/components/parameters/currentMember'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Members'
            application/xml:
              schema:
                $ref: '#/components/schemas/Members'
        '400':
          description: Invalid status value
  /member/{stateCode}/{district}:
    get:
      tags:
      - member
      summary: Returns a list of members filtered by state and district.
      description: Returns a list of members filtered by state and district.
      parameters:
      - $ref: '#/components/parameters/stateCode'
      - $ref: '#/components/parameters/district'
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/currentMember'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Members'
            application/xml:
              schema:
                $ref: '#/components/schemas/Members'
        '400':
          description: Invalid status value
  /member/congress/{congress}/{stateCode}/{district}:
    get:
      tags:
      - member
      summary: Returns a list of members filtered by congress, state and district.
      description: Returns a list of members filtered by congress, state and district.
      parameters:
      - $ref: '#/components/parameters/stateCode'
      - $ref: '#/components/parameters/district'
      - $ref: '#/components/parameters/congress'
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/currentMember'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Members'
            application/xml:
              schema:
                $ref: '#/components/schemas/Members'
        '400':
          description: Invalid status value
components:
  parameters:
    congress:
      name: congress
      in: path
      description: The congress number. For example, can be 117.
      required: true
      schema:
        type: integer
        format: int32
    limit:
      name: limit
      in: query
      description: The number of records returned. The maximum limit is 250.
      required: false
      schema:
        type: integer
    offset:
      name: offset
      in: query
      description: The starting record returned. 0 is the first record.
      required: false
      schema:
        type: integer
    stateCode:
      name: stateCode
      in: path
      description: The two letter identifier for the state the member represents. For example, the value can be MI for Michigan.
      required: true
      schema:
        type: string
    format:
      name: format
      in: query
      description: The data format. Value can be xml or json.
      required: false
      schema:
        type: string
        default: xml
        enum:
        - xml
        - json
    bioguideId:
      name: bioguideId
      in: path
      description: The bioguide identifier for the congressional member. For example, the value can be L000174.
      required: true
      schema:
        type: string
    currentMember:
      name: currentMember
      in: query
      description: The status of the member. Use true or false
      schema:
        type: string
        enum:
        - true
        - false
    fromDateTime:
      name: fromDateTime
      in: query
      description: 'The starting timestamp to filter by update date. Use format: YYYY-MM-DDT00:00:00Z.'
      required: false
      schema:
        type: string
    toDateTime:
      name: toDateTime
      in: query
      description: 'The ending timestamp to filter by update date. Use format: YYYY-MM-DDT00:00:00Z.'
      required: false
      schema:
        type: string
    district:
      name: district
      in: path
      description: The district number for the district the member represents. For example, the value can be 10.
      required: true
      schema:
        type: integer
  schemas:
    latestAction:
      type: object
      properties:
        actionDate:
          type: string
          format: date
          example: '2022-06-16'
        text:
          type: string
          example: Read twice and referred to the Committee on the Judiciary.
    policyArea:
      type: object
      properties:
        name:
          type: string
          example: Government Operations and Politics
    Members:
      type: object
      properties:
        bioguideId:
          type: string
          example: N000147
        depiction:
          type: object
          properties:
            attribution:
              type: string
              example: Congressional Pictorial Directory
            imageUrl:
              type: string
              format: url
              example: https://www.congress.gov/img/member/116_dg_dc_norton_eleanor_200.jpg
        name:
          type: string
          example: Norton, Eleanor Holmes
        partyName:
          type: string
          example: Democratic
        state:
          type: string
          example: District of Columbia
        terms:
          type: object
          properties:
            item:
              type: array
              items:
                $ref: '#/components/schemas/memberTerms'
        updateDate:
          type: string
          format: date-time
          example: '2025-11-12T08:45:43Z'
        url:
          type: string
          format: url
          example: https://api.congress.gov/v3/member/N000147?format=json
    leadership:
      type: object
      properties:
        congress:
          type: integer
          example: 113
        type:
          type: string
          example: President Pro Tempore
    partyHistory:
      type: object
      properties:
        partyAbbreviation:
          type: string
          example: D
        partyName:
          type: string
          example: Democrat
        startYear:
          type: integer
          example: 1975
    sponsoredLegislation:
      type: object
      properties:
        congress:
          type: integer
          example: 117
        introducedDate:
          type: string
          format: date
          example: '2022-06-16'
        latestAction:
          $ref: '#/components/schemas/latestAction'
        number:
          type: string
          example: '4417'
        policyArea:
          $ref: '#/components/schemas/policyArea'
        title:
          type: string
          example: Patent Trial and Appeal Board Reform Act of 2022
        type:
          type: string
          example: S
        url:
          type: string
          format: url
          example: https://api.congress.gov/v3/bill/117/s/4417?format=json
    memberTerms:
      type: object
      properties:
        chamber:
          type: string
          example: House of Representatives
        startYear:
          type: integer
          example: 1991
    Member:
      type: object
      properties:
        bioguideId:
          type: string
          example: L000174
        birthYear:
          type: string
          example: '1940'
        cosponsoredLegislation:
          type: object
          properties:
            count:
              type: integer
              example: 1
            url:
              type: string
              example: https://api.congress.gov/v3/member/L000174/cosponsored-legislation"
        depiction:
          type: object
          properties:
            attribution:
              type: string
              example: <a href="\&quot;https://www.senate.gov/artandhistory/history/common/generic/Photo_Collection_of_the_Senate_Historical_Office.htm\&quot;">Courtesy U.S. Senate Historical Office</a>
            imageUrl:
              type: string
              format: url
              example: https://www.congress.gov/img/member/l000174_200.jpg
        directOrderName:
          type: string
          example: Patrick J. Leahy
        firstName:
          type: string
          example: Patrick
        honorificName:
          type: string
          example: Mr.
        invertedOrderName:
          type: string
          example: Leahy, Patrick J.
        lastname:
          type: string
          example: Leahy
        leadership:
          type: array
          items:
            $ref: '#/components/schemas/leadership'
        partyHistory:
          type: array
          items:
            $ref: '#/components/schemas/partyHistory'
        sponsoredLegislation:
          type: object
          properties:
            count:
              type: integer
              example: 1768
            url:
              type: string
              format: url
              example: https://api.congress.gov/v3/member/L000174/sponsored-legislation
        state:
          type: string
          example: Vermont
        terms:
          type: array
          items:
            $ref: '#/components/schemas/memberDetailTerms'
        updateDate:
          type: string
          format: date-time
          example: '2022-11-07T13:42:19Z'
    MemberSponsoredLegislation:
      type: array
      items:
        $ref: '#/components/schemas/sponsoredLegislation'
    memberDetailTerms:
      type: object
      properties:
        chamber:
          type: string
          example: Senate
        congress:
          type: integer
          example: 116
        endYear:
          type: integer
          example: 2021
        memberType:
          type: string
          example: Senator
        startYear:
          type: integer
          example: 2019
        stateCode:
          type: string
          example: VT
        stateName:
          type: string
          example: Vermont
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: query
      name: api_key