React 19: New Features and Improvements

React 19 brings exciting new features for modern web development.

Server Components

Server Components allow you to render components on the server:

// This component runs on the server
async function UserProfile({ userId }) {
  const user = await fetchUser(userId);
  return <div>{user.name}</div>;
}

Actions

New form handling with Actions API simplifies data mutations:

async function handleSubmit(formData) {
  'use server';
  await saveToDatabase(formData);
}

<form action={handleSubmit}>
  <input name="email" type="email" />
  <button type="submit">Submit</button>
</form>

use() Hook

The new use() hook for reading resources:

function Comments({ commentsPromise }) {
  const comments = use(commentsPromise);
  return comments.map(comment => <p>{comment.text}</p>);
}

Improved Suspense

Better loading states and streaming:

<Suspense fallback={<Loading />}>
  <SlowComponent />
</Suspense>

Conclusion

React 19 makes building modern web applications easier and more performant than ever.