openapi: 3.0.3
info:
  title: Detect Language API
  description: |
    The Detect Language API identifies the language of a given text with high
    accuracy, supporting 164 languages. It accepts single or batch detection
    requests and returns confidence scores and reliability indicators.
  version: '0.2'
  contact:
    name: Detect Language Support
    url: https://detectlanguage.com/
  license:
    name: Proprietary
    url: https://detectlanguage.com/terms
servers:
  - url: https://ws.detectlanguage.com/0.2
    description: Production
security:
  - bearerAuth: []
tags:
  - name: Detection
    description: Language detection endpoints
  - name: Account
    description: Account status and metadata
  - name: Languages
    description: Supported languages
paths:
  /detect:
    post:
      tags:
        - Detection
      summary: Detect language of text
      description: |
        Detects the language of a given text. The request body may contain a
        single string under `q` or an array of strings for batch detection.
      operationId: detectLanguage
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DetectRequest'
      responses:
        '200':
          description: Detection results
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DetectResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /user/status:
    get:
      tags:
        - Account
      summary: Get account status
      description: Returns current account status, plan, usage, and limits.
      operationId: getUserStatus
      responses:
        '200':
          description: Account status
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UserStatus'
  /languages:
    get:
      tags:
        - Languages
      summary: List supported languages
      description: Returns the list of all languages supported by the API.
      operationId: listLanguages
      responses:
        '200':
          description: Supported languages
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Language'
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Bearer token using the API key issued in the Detect Language dashboard.
  schemas:
    DetectRequest:
      type: object
      required:
        - q
      properties:
        q:
          oneOf:
            - type: string
              description: Single text to detect
            - type: array
              items:
                type: string
              description: Batch of texts to detect
    DetectResponse:
      type: object
      properties:
        data:
          type: object
          properties:
            detections:
              oneOf:
                - type: array
                  items:
                    $ref: '#/components/schemas/Detection'
                - type: array
                  items:
                    type: array
                    items:
                      $ref: '#/components/schemas/Detection'
    Detection:
      type: object
      properties:
        language:
          type: string
          description: ISO 639-1 language code
          example: en
        isReliable:
          type: boolean
          description: Whether the detection is considered reliable
        confidence:
          type: number
          format: float
          description: Confidence score; can exceed 100
    UserStatus:
      type: object
      properties:
        date:
          type: string
          format: date
        requests:
          type: integer
        bytes:
          type: integer
        plan:
          type: string
        plan_expires:
          type: string
          nullable: true
        daily_requests_limit:
          type: integer
        daily_bytes_limit:
          type: integer
        status:
          type: string
    Language:
      type: object
      properties:
        code:
          type: string
        name:
          type: string
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
            code:
              type: integer