openapi: 3.0.1
info:
  title: CVAT REST annotations labels API
  description: REST API for CVAT (Computer Vision Annotation Tool), an open-source platform for annotating images, video, and 3D point clouds. The same API is served by self-hosted CVAT (MIT-licensed) and by the hosted CVAT Online service at app.cvat.ai. Endpoints cover projects, tasks, jobs, annotations, labels, organizations, memberships, and cloud storage. The full machine-readable schema is published by each server at /api/schema/ and the interactive docs at /api/docs/. This document captures a representative subset of the documented surface.
  termsOfService: https://www.cvat.ai/terms-of-use
  contact:
    name: CVAT Support
    url: https://www.cvat.ai
  license:
    name: MIT License
    url: https://en.wikipedia.org/wiki/MIT_License
  version: '2.0'
servers:
- url: https://app.cvat.ai/api
  description: CVAT Online (hosted)
- url: http://localhost:8080/api
  description: Self-hosted CVAT (default)
security:
- tokenAuth: []
- basicAuth: []
tags:
- name: labels
  description: Label taxonomy shared across projects, tasks, and jobs.
paths:
  /labels:
    get:
      operationId: labels_list
      tags:
      - labels
      summary: List labels
      parameters:
      - $ref: '#/components/parameters/Page'
      - $ref: '#/components/parameters/PageSize'
      - name: task_id
        in: query
        schema:
          type: integer
      - name: project_id
        in: query
        schema:
          type: integer
      responses:
        '200':
          description: A paginated list of labels.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedLabelList'
  /labels/{id}:
    parameters:
    - $ref: '#/components/parameters/PathId'
    get:
      operationId: labels_retrieve
      tags:
      - labels
      summary: Retrieve a label
      responses:
        '200':
          description: The requested label.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Label'
    patch:
      operationId: labels_partial_update
      tags:
      - labels
      summary: Update a label
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Label'
      responses:
        '200':
          description: The updated label.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Label'
    delete:
      operationId: labels_destroy
      tags:
      - labels
      summary: Delete a label
      responses:
        '204':
          description: The label has been deleted.
components:
  schemas:
    Attribute:
      type: object
      properties:
        id:
          type: integer
          readOnly: true
        name:
          type: string
        mutable:
          type: boolean
        input_type:
          type: string
          enum:
          - checkbox
          - radio
          - number
          - text
          - select
        default_value:
          type: string
        values:
          type: array
          items:
            type: string
    PaginatedBase:
      type: object
      properties:
        count:
          type: integer
        next:
          type: string
          format: uri
          nullable: true
        previous:
          type: string
          format: uri
          nullable: true
        results:
          type: array
          items:
            type: object
    PaginatedLabelList:
      $ref: '#/components/schemas/PaginatedBase'
    Label:
      type: object
      properties:
        id:
          type: integer
          readOnly: true
        name:
          type: string
        color:
          type: string
          description: Hex color used to render the label.
        type:
          type: string
          enum:
          - any
          - rectangle
          - polygon
          - polyline
          - points
          - ellipse
          - cuboid
          - mask
          - tag
          - skeleton
        attributes:
          type: array
          items:
            $ref: '#/components/schemas/Attribute'
        parent_id:
          type: integer
          nullable: true
  parameters:
    Page:
      name: page
      in: query
      schema:
        type: integer
      description: A page number within the paginated result set.
    PathId:
      name: id
      in: path
      required: true
      schema:
        type: integer
      description: A unique integer value identifying this resource.
    PageSize:
      name: page_size
      in: query
      schema:
        type: integer
      description: Number of results to return per page.
  securitySchemes:
    tokenAuth:
      type: apiKey
      in: header
      name: Authorization
      description: 'Token authentication. Send the header `Authorization: Token <key>` where the key is obtained from POST /auth/login.'
    basicAuth:
      type: http
      scheme: basic
      description: HTTP Basic authentication with CVAT username and password.