Tutorials

Make a Form's schema authoritative with Strict mode

Strict mode is off by default, so the schema guides generation instead of policing answers. Turn it on per Form and an undeclared field becomes a refusal, with File fields authoritative either way.

Catch a bad Submission before Send with Preflight

Ask the Form's own judgment while the person is still on the page. Preflight checks request shape, Origin and Strict schema, stores no row, and never promises the real Submission will be accepted.