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How do I set up server actions in Next.js 16?
Server actions in Next.js 16 are defined by adding "use server" at the top of an async function. You can define them inline within a server component or in a separate file. They run on the server and can be called from client components via form actions or direct invocation. The framework handles serialization and network transport automatically.
Can I use them with form validation?
Yes. Pair server actions with Zod for schema validation. Define your schema, then validate the FormData inside the action. Return validation errors as a typed response that the client component can display inline. This gives you end-to-end type safety from form to database.