openapi: 3.0.3
info:
  title: TextGears Account Language API
  description: TextGears is a grammar checking and text analysis REST API providing spelling corrections, grammar error detection, readability scoring, language detection, text summarization, and custom dictionary management across 11 languages. The service processes over 10.8 million API requests daily with distributed infrastructure across Estonia, Singapore, and the United States.
  version: 1.0.0
  contact:
    url: https://textgears.com
  termsOfService: https://textgears.com/terms
  license:
    name: Commercial
    url: https://textgears.com
servers:
- url: https://api.textgears.com
  description: Auto-routing (recommended)
- url: https://eu.api.textgears.com
  description: Europe
- url: https://us.api.textgears.com
  description: United States
- url: https://sg.api.textgears.com
  description: Asia (Singapore)
security:
- apiKeyQuery: []
- apiKeyHeader: []
tags:
- name: Language
  description: Language detection
paths:
  /detect:
    post:
      operationId: detectLanguage
      summary: Detect language
      description: Determines the language and dialect of the provided text with probability scores for multiple language candidates.
      tags:
      - Language
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/DetectRequest'
          application/json:
            schema:
              $ref: '#/components/schemas/DetectRequest'
      responses:
        '200':
          description: Language detection result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DetectResponse'
              example:
                status: true
                response:
                  language: en-US
                  multiLanguages:
                  - language: en-US
                    score: 0.95
                  - language: en-GB
                    score: 0.05
        '400':
          $ref: '#/components/responses/ErrorResponse'
components:
  responses:
    ErrorResponse:
      description: API error
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          examples:
            invalidKey:
              summary: Invalid API key
              value:
                status: false
                error_code: 600
                description: Invalid key
            rateLimitExceeded:
              summary: Rate limit exceeded
              value:
                status: false
                error_code: 607
                description: Request limit exceeded
  schemas:
    DetectRequest:
      type: object
      required:
      - text
      properties:
        text:
          type: string
          description: UTF-8 encoded text for language detection
        key:
          type: string
          description: API authentication key
    ErrorResponse:
      type: object
      properties:
        status:
          type: boolean
          example: false
        error_code:
          type: integer
          description: Error code
          enum:
          - 500
          - 501
          - 600
          - 606
          - 607
        description:
          type: string
          description: Human-readable error description
    DetectResponse:
      type: object
      properties:
        status:
          type: boolean
        response:
          type: object
          properties:
            language:
              type: string
              description: Most likely language code detected
            multiLanguages:
              type: array
              items:
                type: object
                properties:
                  language:
                    type: string
                  score:
                    type: number
                    description: Probability score (0.0 to 1.0)
  securitySchemes:
    apiKeyQuery:
      type: apiKey
      in: query
      name: key
      description: API key passed as a query parameter
    apiKeyHeader:
      type: http
      scheme: basic
      description: API key passed as HTTP Basic Authorization header value