Two Paradigms, One Form

Server Actions are designed to receive native FormData via the form's action attribute, while react-hook-form's validation model is built around an onSubmit callback receiving already-validated JavaScript values — the two cannot be composed directly

react-hook-form cannot be used inside any component that is not a Server Component

Server Actions require every field to be a controlled component, which react-hook-form does not support

The form's action prop can only accept a string URL when react-hook-form is present