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Formbase stores whatever data you submit. It does not enforce a schema or validate field values on the server, so you should validate input in your frontend or in a backend proxy. Use client-side validation for UX and server-side validation when data integrity matters.
1

Add client-side rules

<input name="email" type="email" required />
<input name="age" type="number" min="18" max="120" />
Native HTML constraints are the fastest way to reduce invalid submissions.
2

Validate on the server (optional)

If you need stricter validation, submit to your own API first, validate, then forward to Formbase.
Anyone can bypass browser validation or submit directly to the endpoint. Use server-side validation for critical workflows.