Formstack Forms API

openapi: 3.1.0
info:
  title: Formstack Confirmations Forms API
  description: 'REST API for Formstack — manage forms, fields, submissions, confirmations,

    notifications, webhooks, themes, folders, portals, smart lists, subaccounts,

    submit actions, and partial submissions. Authentication uses OAuth 2.0.


    Detailed endpoint definitions are derived from the public developer portal

    at https://developers.formstack.com/ (machine-readable index at

    https://developers.formstack.com/llms.txt).

    '
  version: 2025.0
  contact:
    name: Formstack Developers
    url: https://developers.formstack.com/
servers:
- url: https://www.formstack.com/api/v2
  description: Production v2
security:
- oauth2: []
tags:
- name: Forms
paths:
  /forms.json:
    get:
      summary: List forms
      operationId: listForms
      tags:
      - Forms
      parameters:
      - $ref: '#/components/parameters/page'
      - $ref: '#/components/parameters/per_page'
      - name: folder
        in: query
        schema:
          type: string
      responses:
        '200':
          description: Paginated list of forms.
    post:
      summary: Create a form
      operationId: createForm
      tags:
      - Forms
      responses:
        '200':
          description: Form created.
  /form/{formId}.json:
    parameters:
    - $ref: '#/components/parameters/formId'
    get:
      summary: Get form
      operationId: getForm
      tags:
      - Forms
      responses:
        '200':
          description: Form.
    put:
      summary: Update form
      operationId: updateForm
      tags:
      - Forms
      responses:
        '200':
          description: Form updated.
    delete:
      summary: Delete form
      operationId: deleteForm
      tags:
      - Forms
      responses:
        '200':
          description: Form deleted.
  /form/{formId}/html.json:
    parameters:
    - $ref: '#/components/parameters/formId'
    get:
      summary: Get form HTML
      operationId: getFormHtml
      tags:
      - Forms
      responses:
        '200':
          description: Form HTML.
  /form/{formId}/copy.json:
    parameters:
    - $ref: '#/components/parameters/formId'
    post:
      summary: Copy form
      operationId: copyForm
      tags:
      - Forms
      responses:
        '200':
          description: Copied form.
  /form/{formId}/prefill.json:
    parameters:
    - $ref: '#/components/parameters/formId'
    post:
      summary: Generate prefilled URL
      operationId: prefillForm
      tags:
      - Forms
      responses:
        '200':
          description: Prefilled URL generated.
components:
  parameters:
    formId:
      name: formId
      in: path
      required: true
      schema:
        type: string
    page:
      name: page
      in: query
      schema:
        type: integer
        minimum: 1
    per_page:
      name: per_page
      in: query
      schema:
        type: integer
        minimum: 1
        maximum: 100
  securitySchemes:
    oauth2:
      type: oauth2
      description: OAuth 2.0 authorization code flow.
      flows:
        authorizationCode:
          authorizationUrl: https://www.formstack.com/api/v2/oauth2/authorize
          tokenUrl: https://www.formstack.com/api/v2/oauth2/token
          scopes:
            forms_read: Read forms
            forms_write: Manage forms
            submissions_read: Read submissions
            submissions_write: Manage submissions