React 19 Actions vs useState loading
What problem do React 19 Actions / useActionState solve compared to manual isSubmitting useState patterns?
Answers use simple, clear English.
Quick interview answer
Actions standardize async mutations with built-in pending/error/result handling. useActionState returns [state, action, isPending]. Forms can pass action={fn} for progressive enhancement.
Detailed answer
Actions standardize async mutations with built-in pending/error/result handling. useActionState returns [state, action, isPending]. Forms can pass action={fn} for progressive enhancement. This reduces boilerplate of setLoading(true/false) try/catch and pairs with Server Actions in Next.js. You still validate input and handle auth on the server.
Real example & use case
Profile save form: action posts to server; button disabled via pending; show returned validation errors from state.
Pros & cons
Pros: less glue code, better form UX defaults. Cons: team must learn new APIs; not every mutation fits form actions.