openapi: 3.1.0
info:
  title: Free Law Project / CourtListener REST Alerts Case Law API
  description: The CourtListener REST API (operated by Free Law Project) provides programmatic access to case law, PACER data, the RECAP archive, oral arguments, judges, financial disclosures, citations, citation networks, alerts, tags, and visualizations.
  version: '4.3'
  contact:
    name: Free Law Project
    url: https://free.law/
servers:
- url: https://www.courtlistener.com/api/rest/v4
  description: CourtListener REST API v4
security:
- TokenAuth: []
tags:
- name: Case Law
  description: Opinions, clusters, dockets, and courts.
paths:
  /opinions/:
    get:
      summary: List opinions
      operationId: listOpinions
      tags:
      - Case Law
      parameters:
      - $ref: '#/components/parameters/Page'
      - $ref: '#/components/parameters/Fields'
      - $ref: '#/components/parameters/Omit'
      - $ref: '#/components/parameters/OrderBy'
      responses:
        '200':
          description: Paginated list of opinions.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedResponse'
  /opinions/{id}/:
    get:
      summary: Retrieve an opinion
      operationId: getOpinion
      tags:
      - Case Law
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: integer
      responses:
        '200':
          description: Opinion detail.
  /clusters/:
    get:
      summary: List opinion clusters
      operationId: listClusters
      tags:
      - Case Law
      parameters:
      - $ref: '#/components/parameters/Page'
      responses:
        '200':
          description: Paginated list of clusters.
components:
  parameters:
    Omit:
      name: omit
      in: query
      schema:
        type: string
      description: Comma-separated list of fields to omit.
    Page:
      name: page
      in: query
      schema:
        type: integer
        minimum: 1
        maximum: 100
    OrderBy:
      name: order_by
      in: query
      schema:
        type: string
      description: Field to order by; prefix with `-` for descending.
    Fields:
      name: fields
      in: query
      schema:
        type: string
      description: Comma-separated list of fields to include.
  schemas:
    PaginatedResponse:
      type: object
      properties:
        count:
          type: integer
        next:
          type: string
          nullable: true
        previous:
          type: string
          nullable: true
        results:
          type: array
          items:
            type: object
  securitySchemes:
    TokenAuth:
      type: apiKey
      in: header
      name: Authorization
      description: 'HTTP token authentication. Format: `Token <your-token>`.'