Napkin Visuals API

openapi: 3.2.0
info:
  title: Napkin Visuals API
  version: 1.1.16
  description: 'The Napkin API turns typed or pasted text into editable visuals — diagrams, charts, icons, and infographics — programmatically. Generation is asynchronous: create a visual request, poll its status, then download the generated files (SVG, PNG, or PPT). Currently a developer preview; endpoints may change. Report issues to api@napkin.ai.'
  contact:
    name: Napkin API Support
    email: api@napkin.ai
    url: https://api.napkin.ai/
  termsOfService: https://www.napkin.ai/terms-conditions/
servers:
- url: https://api.napkin.ai
  description: Production
tags:
- name: Visuals
  description: Create, poll, and download programmatic visual generations.
paths:
  /v1/visual:
    post:
      operationId: createVisualRequest
      summary: Create a visual request
      description: Submit text and generation options; Napkin processes the request asynchronously and returns a request identifier. Most requests complete within 10-30 seconds. Poll the status endpoint to retrieve download links when processing completes.
      tags:
      - Visuals
      security:
      - bearerAuth: []
      - oauth2:
        - generation
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VisualRequestInput'
      responses:
        '201':
          description: Visual request created successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VisualRequest'
        '400':
          description: Invalid request data.
        '401':
          description: Authentication required or invalid token.
        '429':
          description: Rate limit exceeded (see Retry-After).
        '500':
          description: Internal server error.
  /v1/visual/{request-id}/status:
    get:
      operationId: getVisualRequestStatus
      summary: Get visual request status
      description: Retrieve the processing status of a visual request. When status is "completed" the response includes generated_files with download metadata. Status and file URLs expire 30 minutes after generation.
      tags:
      - Visuals
      security:
      - bearerAuth: []
      - oauth2:
        - generation
      parameters:
      - name: request-id
        in: path
        required: true
        description: The unique identifier of the visual request.
        schema:
          type: string
      responses:
        '200':
          description: Request status retrieved successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VisualRequestStatus'
        '400':
          description: Invalid request ID format.
        '401':
          description: Authentication required or invalid token.
        '403':
          description: Access denied - request belongs to another user.
        '404':
          description: Request not found.
        '410':
          description: Request has expired and is no longer available.
        '500':
          description: Internal server error.
  /v1/visual/{request-id}/file/{file-id}:
    get:
      operationId: downloadVisualFile
      summary: Download a generated file
      description: Download a specific generated file for a completed visual request. Response is the raw file bytes with Content-Type (e.g. image/svg+xml) and Content-Length headers. Files are only available for requests with status "completed" and expire 30 minutes after generation.
      tags:
      - Visuals
      security:
      - bearerAuth: []
      - oauth2:
        - generation
      parameters:
      - name: request-id
        in: path
        required: true
        description: Identifier for the completed visual request.
        schema:
          type: string
      - name: file-id
        in: path
        required: true
        description: Identifier for the specific file to download.
        schema:
          type: string
      responses:
        '200':
          description: File downloaded successfully.
          content:
            image/svg+xml: {}
            image/png: {}
            application/vnd.openxmlformats-officedocument.presentationml.presentation: {}
        '400':
          description: Invalid request ID or file ID format.
        '401':
          description: Authentication required or invalid token.
        '403':
          description: Access denied - request belongs to another user.
        '404':
          description: Request or file not found.
        '410':
          description: Request has expired and is no longer available.
        '500':
          description: Internal server error.
components:
  schemas:
    VisualRequestStatus:
      type: object
      description: Processing status of a visual request.
      properties:
        status:
          type: string
          enum:
          - pending
          - completed
          - failed
          description: Current processing state.
        generated_files:
          type: array
          description: Download links and metadata; present when status is "completed".
          items:
            $ref: '#/components/schemas/GeneratedFile'
        warnings:
          type: array
          description: Non-fatal warning codes (since v0.8.5).
          items:
            type: string
        error:
          $ref: '#/components/schemas/ErrorDetail'
    VisualRequest:
      type: object
      description: Response returned when a visual request is accepted for processing.
      properties:
        id:
          type: string
          description: Unique identifier of the created visual request.
        status:
          type: string
          enum:
          - pending
          - completed
          - failed
        error:
          $ref: '#/components/schemas/ErrorDetail'
    ErrorDetail:
      type: object
      description: Error object with codes and warning codes on visual request responses (since v0.12.0).
      properties:
        code:
          type: string
        message:
          type: string
    VisualRequestInput:
      type: object
      required:
      - content
      description: Parameters accepted by POST /v1/visual. Field set transcribed from the published API reference and changelog; only `content` is required.
      properties:
        content:
          type: string
          description: The text to transform into visuals. Maximum 100,000 bytes.
          maxLength: 100000
        format:
          type: string
          description: Output file format.
          enum:
          - svg
          - png
          - ppt
          default: svg
        language:
          type: string
          description: Content language. Optional; auto-detected when omitted (since v0.13.0).
        number_of_visuals:
          type: integer
          description: How many visual variations to generate.
        style_id:
          type: string
          description: Identifier of a custom style to apply to the visual request (since v0.3.0).
        visual_id:
          type: string
          description: Identifier used to request generation of a specific visual.
        visual_query:
          type: string
          description: A single natural-language query describing the desired visual (since v0.4.0).
        visual_queries:
          type: array
          items:
            type: string
          description: Multiple visual queries (since v0.4.0).
        orientation:
          type: string
          description: Preferred visual orientation (since v0.5.1).
        color_mode:
          type: string
          description: Color mode for the generated visual (since v0.8.0). Supersedes inverted_color.
        sort_strategy:
          type: string
          description: Strategy for sorting/selecting returned visuals. Supports a "variation" option for increased visual layout variety (since v1.1.4).
        text_extraction_mode:
          type: string
          description: Controls how text is extracted from the input content (since v0.8.1).
        inverted_color:
          type: boolean
          deprecated: true
          description: Deprecated in v0.8.0 in favor of color_mode.
        context_before:
          type: string
          deprecated: true
          description: Deprecated in v0.5.1.
        context_after:
          type: string
          deprecated: true
          description: Deprecated in v0.5.1.
    GeneratedFile:
      type: object
      description: A single generated output file for a completed request.
      properties:
        file_id:
          type: string
          description: Identifier used to download the file via /v1/visual/{request-id}/file/{file-id}.
        url:
          type: string
          format: uri
          description: Download URL (expires 30 minutes after generation).
        format:
          type: string
          enum:
          - svg
          - png
          - ppt
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Napkin account API token. Create one at app.napkin.ai -> Account/Team Space Settings -> Developers -> "Create new API token". Send as: Authorization: Bearer YOUR_API_TOKEN.'
    oauth2:
      type: oauth2
      description: OAuth 2.0 authorization code flow for acting on behalf of Napkin users. Applications must be approved by Napkin (contact api@napkin.ai) to obtain client credentials. Access token TTL 1 hour, refresh token 30 days, authorization code 10 minutes.
      flows:
        authorizationCode:
          authorizationUrl: https://api.napkin.ai/v1/oauth/authorize
          tokenUrl: https://api.napkin.ai/v1/oauth/token
          refreshUrl: https://api.napkin.ai/v1/oauth/token
          scopes:
            user: Access to basic user profile information (email, name, user ID).
            generation: Ability to create visual generations on behalf of the user.