HeyForm Upload API

openapi: 3.0.3
info:
  title: HeyForm Auth Upload API
  description: HeyForm is an open-source conversational form builder providing REST and GraphQL endpoints for managing forms, submissions, workspaces, integrations, and webhooks. The primary data API uses GraphQL; this document covers the publicly accessible REST endpoints discovered in the open-source codebase.
  version: 1.0.0
  contact:
    name: HeyForm Support
    url: https://docs.heyform.net
  license:
    name: AGPL-3.0
    url: https://github.com/heyform/heyform/blob/main/LICENSE
servers:
- url: https://api.heyform.net
  description: HeyForm Cloud API
- url: http://localhost:8000
  description: Self-hosted HeyForm instance (default port)
tags:
- name: Upload
  description: File upload
paths:
  /api/upload:
    post:
      operationId: uploadFile
      summary: Upload a file
      description: Uploads a file (image or document) to the HeyForm storage backend. Returns the URL at which the uploaded file can be accessed. SVG files are blocked for security reasons.
      tags:
      - Upload
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              required:
              - file
              properties:
                file:
                  type: string
                  format: binary
                  description: The file to upload.
      responses:
        '201':
          description: File uploaded successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UploadResult'
              example:
                filename: photo.jpg
                url: https://heyform.net/static/upload/photo-abc123.jpg
                size: 204800
        '400':
          $ref: '#/components/responses/BadRequest'
components:
  responses:
    BadRequest:
      description: Bad request — invalid input or business logic violation
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            statusCode: 400
            message: The form does not exist
            error: Bad Request
  schemas:
    UploadResult:
      type: object
      description: Result of a successful file upload.
      required:
      - filename
      - url
      - size
      properties:
        filename:
          type: string
          description: Original filename of the uploaded file.
        url:
          type: string
          format: uri
          description: Publicly accessible URL of the uploaded file.
        size:
          type: integer
          description: File size in bytes.
    Error:
      type: object
      properties:
        statusCode:
          type: integer
        message:
          type: string
        error:
          type: string
  securitySchemes:
    cookieAuth:
      type: apiKey
      in: cookie
      name: heyform_sid
      description: Session cookie set by the login mutation or OAuth callback. All authenticated GraphQL mutations and the CSV export endpoint require this cookie.
externalDocs:
  description: HeyForm Documentation
  url: https://docs.heyform.net