Google Image Generation API

openapi: 3.1.0
info:
  title: Google Books About Image Generation API
  description: API for retrieving Bookshelf and Volume resources from Google Books
  version: 1.0.0
  contact:
    name: Google Books API
    url: https://developers.google.com/books
servers:
- url: https://www.googleapis.com/books/v1
  description: Google Books API v1
tags:
- name: Image Generation
  description: Operations related to Image Generation
paths:
  /models/{imageModel}:generateContent:
    post:
      tags:
      - Image Generation
      summary: Google Generate Images
      description: "Generate and process images conversationally. Supports text-to-image, text-and-image-to-image, \nand multi-turn image editing. All generated images include a SynthID watermark.\n"
      operationId: generateImage
      parameters:
      - name: imageModel
        in: path
        required: true
        description: The image generation model to use
        schema:
          type: string
          enum:
          - gemini-2.5-flash-image
          - gemini-3-pro-image-preview
          example: gemini-2.5-flash-image
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ImageGenerationRequest'
      responses:
        '200':
          description: Successful response with generated image
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ImageGenerationResponse'
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Unauthorized - Invalid API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Too many requests
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      x-microcks-operation:
        delay: 100
        dispatcher: FALLBACK
        dispatcherRules: SuccessExample
components:
  schemas:
    PromptFeedback:
      type: object
      properties:
        blockReason:
          type: string
          enum:
          - BLOCK_REASON_UNSPECIFIED
          - SAFETY
          - OTHER
          description: Reason why prompt was blocked
        safetyRatings:
          type: array
          items:
            $ref: '#/components/schemas/SafetyRating'
          description: Safety ratings for the prompt
    Content:
      type: object
      properties:
        role:
          type: string
          enum:
          - user
          - model
          description: The role of the content producer (optional for single-turn, required for multi-turn)
        parts:
          type: array
          description: Ordered parts that constitute a single message
          items:
            $ref: '#/components/schemas/Part'
      required:
      - parts
    Part:
      type: object
      description: A part of the content, can be text, inline data, or file data
      oneOf:
      - type: object
        required:
        - text
        properties:
          text:
            type: string
            description: Text content
      - type: object
        required:
        - inline_data
        properties:
          inline_data:
            $ref: '#/components/schemas/InlineData'
      - type: object
        required:
        - file_data
        properties:
          file_data:
            $ref: '#/components/schemas/FileData'
          video_metadata:
            $ref: '#/components/schemas/VideoMetadata'
            description: Optional metadata for video processing (clipping, FPS)
    SafetyRating:
      type: object
      properties:
        category:
          type: string
          enum:
          - HARM_CATEGORY_UNSPECIFIED
          - HARM_CATEGORY_DEROGATORY
          - HARM_CATEGORY_TOXICITY
          - HARM_CATEGORY_VIOLENCE
          - HARM_CATEGORY_SEXUAL
          - HARM_CATEGORY_MEDICAL
          - HARM_CATEGORY_DANGEROUS
          - HARM_CATEGORY_HARASSMENT
          - HARM_CATEGORY_HATE_SPEECH
          - HARM_CATEGORY_SEXUALLY_EXPLICIT
          - HARM_CATEGORY_DANGEROUS_CONTENT
        probability:
          type: string
          enum:
          - HARM_PROBABILITY_UNSPECIFIED
          - NEGLIGIBLE
          - LOW
          - MEDIUM
          - HIGH
    FileData:
      type: object
      description: Reference to a file uploaded via the File API or a YouTube URL
      properties:
        mime_type:
          type: string
          description: MIME type of the file (optional for YouTube URLs)
          example: video/mp4
        file_uri:
          type: string
          description: URI of the file from File API or YouTube URL
          examples:
          - https://generativelanguage.googleapis.com/v1beta/files/abc123
          - https://www.youtube.com/watch?v=9hE5-98ZeCg
      required:
      - file_uri
    ImageCandidate:
      type: object
      properties:
        content:
          $ref: '#/components/schemas/ImageContent'
          description: Generated content including text and/or images
        finishReason:
          type: string
          enum:
          - FINISH_REASON_UNSPECIFIED
          - STOP
          - MAX_TOKENS
          - SAFETY
          - RECITATION
          - OTHER
          description: Reason why generation stopped
        index:
          type: integer
          description: Index of the candidate
        safetyRatings:
          type: array
          items:
            $ref: '#/components/schemas/SafetyRating'
          description: Safety ratings for the generated content
    UsageMetadata:
      type: object
      properties:
        promptTokenCount:
          type: integer
          description: Number of tokens in the prompt
        candidatesTokenCount:
          type: integer
          description: Number of tokens in generated candidates
        totalTokenCount:
          type: integer
          description: Total token count
    ImageGenerationResponse:
      type: object
      properties:
        candidates:
          type: array
          description: Generated content candidates with images
          items:
            $ref: '#/components/schemas/ImageCandidate'
        promptFeedback:
          $ref: '#/components/schemas/PromptFeedback'
          description: Feedback about the prompt
        usageMetadata:
          $ref: '#/components/schemas/UsageMetadata'
          description: Token usage information
    ImageContent:
      type: object
      properties:
        role:
          type: string
          enum:
          - user
          - model
          description: The role of the content producer
        parts:
          type: array
          description: Ordered parts that constitute a single message (can include text and inline image data)
          items:
            $ref: '#/components/schemas/Part'
      required:
      - parts
    ImageGenerationRequest:
      type: object
      required:
      - contents
      properties:
        contents:
          type: array
          description: The content of the current conversation with the model
          items:
            $ref: '#/components/schemas/Content'
        generationConfig:
          $ref: '#/components/schemas/ImageGenerationConfig'
          description: Configuration options for image generation
    InlineData:
      type: object
      required:
      - mime_type
      - data
      properties:
        mime_type:
          type: string
          description: MIME type of the data
          enum:
          - image/jpeg
          - image/png
          - image/webp
          - video/mp4
          - video/mpeg
          - video/mov
          - video/avi
          - video/x-flv
          - video/mpg
          - video/webm
          - video/wmv
          - video/3gpp
          - audio/wav
          - audio/mp3
          - audio/aiff
          - audio/aac
          - audio/ogg
          - audio/flac
          - application/pdf
        data:
          type: string
          format: byte
          description: Base64 encoded data
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: integer
              description: HTTP status code
            message:
              type: string
              description: Error message
            status:
              type: string
              description: Error status
    ImageGenerationConfig:
      type: object
      description: Configuration options for image generation
      properties:
        responseModalities:
          type: array
          description: Modalities to include in the response
          items:
            type: string
            enum:
            - TEXT
            - IMAGE
          example:
          - TEXT
          - IMAGE
        imageConfig:
          $ref: '#/components/schemas/ImageConfig'
          description: Configuration for image generation
    ImageConfig:
      type: object
      description: Configuration for image generation parameters
      properties:
        aspectRatio:
          type: string
          description: Aspect ratio for generated images
          enum:
          - '1:1'
          - '3:4'
          - '4:3'
          - '9:16'
          - '16:9'
          example: '16:9'
        imageSize:
          type: string
          description: Size of generated images
          enum:
          - 1K
          - 2K
          - 4K
          example: 2K
    VideoMetadata:
      type: object
      description: Metadata for customizing video processing
      properties:
        start_offset:
          type: string
          description: Start time offset for video clipping (format like "1250s")
          pattern: ^\d+s$
          example: 1250s
        end_offset:
          type: string
          description: End time offset for video clipping (format like "1570s")
          pattern: ^\d+s$
          example: 1570s
        fps:
          type: number
          format: float
          description: Custom frame rate sampling (frames per second). Default is 1 FPS. Use <1 for long videos, >1 for rapidly changing visuals
          minimum: 0.1
          example: 5
  securitySchemes:
    OAuth2:
      type: oauth2
      description: OAuth 2.0 authentication for Google Books API
      flows:
        authorizationCode:
          authorizationUrl: https://accounts.google.com/o/oauth2/v2/auth
          tokenUrl: https://oauth2.googleapis.com/token
          scopes:
            https://www.googleapis.com/auth/books: Manage your Google Books library