Mathpix Strokes API

openapi: 3.1.0
info:
  title: Mathpix Strokes API
  description: >
    Mathpix v3/strokes endpoint for digital-ink OCR. Submit raw stroke coordinates (x/y arrays) and
    receive the same MMD/LaTeX/HTML/data output produced by v3/text. Supports session-scoped tokens
    for live handwriting capture in browsers and tablets.
  version: v3
  contact:
    name: Mathpix Support
    url: https://docs.mathpix.com
    email: support@mathpix.com
  license:
    name: Mathpix Terms of Service
    url: https://mathpix.com/terms-of-service
servers:
  - url: https://api.mathpix.com
    description: Production Server
security:
  - AppIdAuth: []
    AppKeyAuth: []
tags:
  - name: Strokes
    description: Recognize handwritten math and text from stroke coordinates.
paths:
  /v3/strokes:
    post:
      summary: Process Strokes
      description: Submit stroke coordinates representing handwriting and receive recognized MMD/LaTeX output.
      operationId: processStrokes
      tags:
        - Strokes
      parameters:
        - $ref: '#/components/parameters/AppIdHeader'
        - $ref: '#/components/parameters/AppKeyHeader'
        - $ref: '#/components/parameters/ContentTypeHeader'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/StrokesRequest'
      responses:
        '200':
          description: Recognition result.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/StrokesResponse'
components:
  securitySchemes:
    AppIdAuth:
      type: apiKey
      in: header
      name: app_id
    AppKeyAuth:
      type: apiKey
      in: header
      name: app_key
  parameters:
    AppIdHeader:
      name: app_id
      in: header
      required: true
      schema:
        type: string
    AppKeyHeader:
      name: app_key
      in: header
      required: true
      schema:
        type: string
    ContentTypeHeader:
      name: Content-Type
      in: header
      required: true
      schema:
        type: string
        default: application/json
  schemas:
    StrokesRequest:
      type: object
      required: [strokes]
      properties:
        strokes:
          type: object
          required: [strokes]
          properties:
            strokes:
              type: object
              required: [x, y]
              properties:
                x:
                  type: array
                  description: Array of x-coordinate arrays, one inner array per stroke.
                  items:
                    type: array
                    items:
                      type: number
                y:
                  type: array
                  description: Array of y-coordinate arrays, one inner array per stroke.
                  items:
                    type: array
                    items:
                      type: number
        strokes_session_id:
          type: string
          description: Session identifier for client-side digital-ink capture.
        formats:
          type: array
          items:
            type: string
            enum: [text, data, html, latex_styled]
        metadata:
          type: object
          additionalProperties: true
    StrokesResponse:
      type: object
      properties:
        request_id:
          type: string
        text:
          type: string
        latex_styled:
          type: string
        confidence:
          type: number
          format: float
        confidence_rate:
          type: number
          format: float
        is_printed:
          type: boolean
        is_handwritten:
          type: boolean
        auto_rotate_confidence:
          type: number
          format: float
        auto_rotate_degrees:
          type: integer
          enum: [0, 90, -90, 180]
        image_height:
          type: integer
        image_width:
          type: integer
        data:
          type: array
          items:
            type: object
            additionalProperties: true
        html:
          type: string
        version:
          type: string