While Formstack offers a wide variety of 3rd-party integrations, sometimes you may need to integrate with a service aside from the ones already offered via integrations. Below is an overview of the capabilities of our API and full details on working with the API can be found on our Developer Central site.
There are currently two versions of our Forms API available through our site - V2 and V2025. The V2 version is battle-tested and has been available for many years. The V2025 version was released in August, 2025 with the added benefit of being OpenAPI-compliant to accelerate getting started and leveraging AI tools. The two versions have feature parity upon launch of the V2025, and future improvements will be captured in the API Changelog found here.
Tip: If you'd like to switch between the versions, you can use the toggle on the top left of the Developer Central site as seen below.
Note: If you're interested in adding API functionality to your account, please contact our sales team for more information. It's important to note that we currently don't support or assist with the building of custom integrations via the API.
Forms
GET - Ability to retrieve all forms in an account or retrieve details for a single form.
POST - Add a new form to the account or copy an existing form.
PUT - Update a specified form.
DELETE - Delete a specified form.
Fields
GET - Ability to retrieve all fields from a single form or retrieve details for a single field.
POST - Add a new field to a specified form.
PUT - Update a specified field.
DELETE - Delete a specified field.
Folders
GET - Ability to retrieve all folders and subfolders in an account or retrieve details for a single folder or subfolder.
POST - Add a new folder or subfolder to the account.
PUT - Update a specified folder.
DELETE - Delete a specified folder and move all forms within it to the Uncategorized folder.
Submissions
GET - Ability to retrieve all submissions from a specified form or details from a specific submission.
POST - Add a new submission for the specified form.
PUT - Update a specified submission.
DELETE - Delete a specified submission.
Partial Submissions
GET - Ability to retrieve all partial submissions from a specified form or details from a specific partial submission.
DELETE - Delete a specified partial submission.
Confirmation Emails
GET - Ability to retrieve all confirmation emails from a specified form or details from a specific confirmation email.
POST - Add a new confirmation email for the specified form.
PUT - Update a specified confirmation email.
DELETE - Delete a specified confirmation email.
Notification Emails
GET - Ability to retrieve all notification emails from a specified form or details from a specific notification email.
POST - Add a new notification email for the specified form.
PUT - Update a specific notification email.
DELETE - Delete a specified notification email.
WebHooks
GET - Ability to retrieve all WebHooks from a specified form or details from a specific WebHook.
POST - Add a new WebHook for the specified form.
PUT - Update a specified WebHook.
DELETE - Delete a specified WebHook.
Field Logic
Ability to apply conditional logic to fields on your form to conditionally show or hide them.
Field Calculations
Ability to add a calculation to a number field within your form.