Server Actions

• Creating a Server Action from a Server Component
• Importing Server Actions from Client Components
• Composing Server Actions with Actions
• Form Actions with Server Actions
• Server Actions with useActionState
• Progressive enhancement with useActionState

When a Server Action is defined with the "use server" directive, your framework will automatically create a reference to the server function, and pass that reference to the Client Component. When that function is called on the client, React will send a request to the server to execute the function, and return the result.

Server Actions can be created in Server Components and passed as props to Client Components, or they can be imported and used in Client Components.

Creating a Server Action from a Server Component

Server Components can define Server Actions with the "use server" directive:

// Server Component
import Button from './Button';

function EmptyNote () {
  async function createNoteAction() {
    // Server Action
    'use server';
    
    await db.notes.create();
  }

  return <Button onClick={createNoteAction}/>;
}

When React renders the EmptyNote Server Component, it will create a reference to the createNoteAction function, and pass that reference to the Button Client Component. When the button is clicked, React will send a request to the server to execute the createNoteAction function with the reference provided:

"use client";

export default function Button({onClick}) { 
  console.log(onClick); 
  // {$$typeof: Symbol.for("react.server.reference"), $$id: 'createNoteAction'}
  return <button onClick={onClick}>Create Empty Note</button>
}

For more, see the docs for "use server".

Importing Server Actions from Client Components

Client Components can import Server Actions from files that use the "use server" directive:

"use server";

export async function createNoteAction() {
  await db.notes.create();
}

When the bundler builds the EmptyNote Client Component, it will create a reference to the createNoteAction function in the bundle. When the button is clicked, React will send a request to the server to execute the createNoteAction function using the reference provided:

"use client";
import {createNoteAction} from './actions';

function EmptyNote() {
  console.log(createNoteAction);
  // {$$typeof: Symbol.for("react.server.reference"), $$id: 'createNoteAction'}
  <button onClick={createNoteAction} />
}

For more, see the docs for "use server".

Composing Server Actions with Actions

Server Actions can be composed with Actions on the client:

"use server";

export async function updateName(name) {
  if (!name) {
    return {error: 'Name is required'};
  }
  await db.users.updateName(name);
}

"use client";

import {updateName} from './actions';

function UpdateName() {
  const [name, setName] = useState('');
  const [error, setError] = useState(null);

  const [isPending, startTransition] = useTransition();

  const submitAction = async () => {
    startTransition(async () => {
      const {error} = await updateName(name);
      if (!error) {
        setError(error);
      } else {
        setName('');
      }
    })
  }
  
  return (
    <form action={submitAction}>
      <input type="text" name="name" disabled={isPending}/>
      {state.error && <span>Failed: {state.error}</span>}
      <button type="submit">Submit</button>
    </form>
  )
}

This allows you to access the isPending state of the Server Action by wrapping it in an Action on the client.

For more, see the docs for Calling a Server Action outside of <form>

Form Actions with Server Actions

Server Actions work with the new Form features in React 19.

You can pass a Server Action to a Form to automatically submit the form to the server:

"use client";

import {updateName} from './actions';

function UpdateName() {
  return (
    <form action={updateName}>
      <input type="text" name="name" />
    </form>
  )
}

When the Form submission succeeds, React will automatically reset the form. You can add useActionState to access the pending state, last response, or to support progressive enhancement.

For more, see the docs for Server Actions in Forms.

Server Actions with useActionState

You can compose Server Actions with useActionState for the common case where you just need access to the action pending state and last returned response:

"use client";

import {updateName} from './actions';

function UpdateName() {
  const [state, submitAction, isPending] = useActionState(updateName, {error: null});

  return (
    <form action={submitAction}>
      <input type="text" name="name" disabled={isPending}/>
      {state.error && <span>Failed: {state.error}</span>}
    </form>
  );
}

When using useActionState with Server Actions, React will also automatically replay form submissions entered before hydration finishes. This means users can interact with your app even before the app has hydrated.

For more, see the docs for useActionState.

Progressive enhancement with useActionState

Server Actions also support progressive enhancement with the third argument of useActionState.

"use client";

import {updateName} from './actions';

function UpdateName() {
  const [, submitAction] = useActionState(updateName, null, `/name/update`);

  return (
    <form action={submitAction}>
      ...
    </form>
  );
}

When the permalink is provided to useActionState, React will redirect to the provided URL if the form is submitted before the JavaScript bundle loads.

For more, see the docs for useActionState.