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Fetch the complete documentation index at: https://docs.formbase.dev/llms.txt

Use this file to discover all available pages before exploring further.

When a submission fails, you may want to show a dedicated error page instead of inline messaging. Formbase responds with standard HTTP status codes, so you can redirect based on the response.
1

Submit the form

Use fetch and inspect the response status.
2

Redirect on failure

const response = await fetch('https://formbase.dev/s/YOUR_FORM_ID', {
  method: 'POST',
  body: new FormData(formElement),
  redirect: 'manual',
});

if (response.status === 303 || response.ok) {
  window.location.href = '/thanks';
  return;
}

window.location.href = `/error?reason=submit_failed&status=${response.status}`;
Include the status code or a reason string to help with debugging.
A 404 response usually means the form ID is invalid. A 500 response often indicates a server or storage configuration issue.