openapi: 3.0.3
info:
  title: languagelayer Batch Detect API
  description: 'Language detection REST API that identifies 173 languages and accents from text with confidence scores, character usage statistics, and batch processing support, powered by an AI-based detection algorithm via the APILayer platform.

    '
  version: '1.0'
  contact:
    name: APILayer Support
    email: support@apilayer.net
    url: https://languagelayer.com/
  termsOfService: https://languagelayer.com/terms
servers:
- url: https://apilayer.net/api
  description: Production API server
security:
- accessKey: []
tags:
- name: Detect
paths:
  /detect:
    get:
      operationId: detectLanguage
      summary: Detect Language
      description: 'Identifies the language of a single text string, returning language code, language name, confidence score, probability score, and character usage statistics across 173 supported languages.

        '
      parameters:
      - name: access_key
        in: query
        required: true
        description: Your API access key obtained from languagelayer.com.
        schema:
          type: string
      - name: query
        in: query
        required: true
        description: The URL-encoded text string whose language you want to detect.
        schema:
          type: string
      responses:
        '200':
          description: Successful language detection response.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DetectResponse'
              example:
                success: true
                results:
                - language_code: en
                  language_name: English
                  probability: 78.4
                  percentage: 99.2
                  reliable_result: true
        '401':
          description: Unauthorized — missing or invalid access key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Endpoint not found.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      tags:
      - Detect
components:
  schemas:
    ErrorResponse:
      type: object
      description: Error response object.
      properties:
        success:
          type: boolean
          example: false
        error:
          $ref: '#/components/schemas/ErrorInfo'
    ErrorInfo:
      type: object
      description: Details about an API error.
      properties:
        code:
          type: integer
          description: Numeric error code.
          example: 101
        type:
          type: string
          description: Short error type identifier.
          example: missing_access_key
        info:
          type: string
          description: Human-readable error description.
          example: You have not supplied an API Access Key.
    LanguageResult:
      type: object
      description: Language detection result for a single text.
      properties:
        language_code:
          type: string
          description: ISO 639-1 or ISO 639-2 language code (e.g. "en", "fr").
          example: en
        language_name:
          type: string
          description: Human-readable language name (e.g. "English").
          example: English
        probability:
          type: number
          format: float
          description: 'Probability score indicating how strongly the language was matched, based on cross-referencing words, expressions, and grammatical constructions.

            '
          example: 78.4
        percentage:
          type: number
          format: float
          description: 'Confidence percentage indicating the API''s level of confidence that the detected language is correct.

            '
          example: 99.2
        reliable_result:
          type: boolean
          description: 'Boolean flag indicating whether the detection result is considered reliable.

            '
          example: true
    DetectResponse:
      type: object
      description: Response object for a single text language detection request.
      properties:
        success:
          type: boolean
          description: Whether the API request was successful.
          example: true
        error:
          $ref: '#/components/schemas/ErrorInfo'
        results:
          type: array
          description: 'List of language detection results ordered by probability score (highest first).

            '
          items:
            $ref: '#/components/schemas/LanguageResult'
  securitySchemes:
    accessKey:
      type: apiKey
      in: query
      name: access_key
      description: API access key obtained from languagelayer.com.
externalDocs:
  description: Official Documentation
  url: https://languagelayer.com/documentation