Web & Next.js

Server Actions

Next.js / React 19 server functions that run on the server but can be called from a client component as if they were local — eliminates the API-route boilerplate for forms and mutations.

A function marked with `'use server'` becomes invokable from the client; Next.js auto-generates the RPC endpoint and handles serialization. Use for form submission, mutations, and any operation that needs server-only credentials. They integrate cleanly with form actions (`<form action={createTask}>`) and `useFormStatus` for pending states.

Related terms

React Server Components(RSC)

A React 19+ rendering model where components run on the server, returning a serialized tree to the client — zero JS for static parts.

Next.js App Router

Next.js 13+'s file-system router built on React Server Components — replaces the Pages Router for new projects.

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