Submissions and connectors

Form0Form supplies a default submission handler when the caller does not provide onSubmit. The handler creates or accepts a structured form0 record and logs it for development.

When devServer.submitToConnector is true, it also calls two local endpoints:

1. POST /api/create-record when the renderer has not already produced a complete structured record.
2. POST /api/submit-record to send that record to connectors managed by form0-cli.

The Vite proxy forwards /api to the CLI development server. Start both processes with:

Code
form0 serve --app

Use CLI connector management to install, configure, test, and inspect a connector. Use Choosing a connector to compare PostgreSQL and SQLite.

Supply application submission behavior

Pass onSubmit to Form0Form to replace the default handler. Set useDefaultSubmitHandler={false} if the form should render without either submission path.

For the complete callback record and metadata contract, see Values, snapshots, and submission.

[!WARNING] The CLI endpoints and Vite proxy are local-development helpers, not a production submission API. A deployed application needs a trusted server boundary with authentication, authorization, validation, rate limiting, and appropriate storage controls. Never ship database credentials to browser code.

Only use schemas from trusted authors. Schema expressions execute within the documented form0-core trust boundary.