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What are Server Actions in Next.js and how do they work?

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01

Understand the problem

Server-side functions callable from the client without an API route.

nextjsserver-actionsmutationsrsc
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

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03

Study the solution

Server Actions are async functions marked 'use server' that run on the server and can be called from components/forms directly — Next.js creates an RPC endpoint under the hood. They handle mutations (DB writes, revalidation) without you writing an API route.

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04

Read the code

A Server Action mutating + revalidating
// app/actions.ts
'use server';
import { revalidatePath } from 'next/cache';

export async function addTodo(formData: FormData) {
  const title = String(formData.get('title'));
  await db.todo.create({ data: { title } });   // runs on the server
  revalidatePath('/todos');                     // refresh the list
}
05

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