Next.js is a popular framework for building server-side rendered React applications. When it comes to user authentication and authorization, Next.js provides a number of options, including NextAuth. NextAuth is an easy-to-use, open-source authentication library that works with a variety of authentication providers. In this blog post, we'll explore how to use NextAuth in Next.js.

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Table of Contents:

1. Installing NextAuth
2. Configuring NextAuth
3. Adding Authentication to Your Pages
4. Conclusion

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Installing NextAuth

To get started with NextAuth, you'll first need to install it in your Next.js application. You can do this by running the following command:

npm install next-auth

Once NextAuth is installed, you can create a new pages/api/auth/[...nextauth].js file to handle authentication requests.

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Configuring NextAuth

NextAuth provides a number of authentication providers out of the box, including Google, Facebook, GitHub, and many others. To use one of these providers, you'll need to configure it in your pages/api/auth/[...nextauth].js file.

Here's an example configuration for using Google authentication:

import NextAuth from 'next-auth';
import Providers from 'next-auth/providers';

export default NextAuth({
  providers: [
    Providers.Google({
      clientId: process.env.GOOGLE_CLIENT_ID,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET,
    }),
  ],
});

In this example, we're using the Google authentication provider and providing our clientId and clientSecret as environment variables.

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Adding Authentication to Your Pages

With NextAuth configured, you can now add authentication to your pages. To do this, you'll need to wrap your page components with the withAuth higher-order component provided by NextAuth.

Here's an example of how to use withAuth:

import { withAuth } from 'next-auth/client';

function MyPage({ user }) {
  return (
    <div>
      <h1>Welcome, {user.name}</h1>
    </div>
  );
}

export default withAuth(MyPage);

In this example, we're using withAuth to wrap our MyPage component. The user object is passed to our component as a prop and contains information about the currently logged-in user.

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Conclusion

NextAuth is a powerful authentication library that makes it easy to add authentication to your Next.js applications. With support for a variety of authentication providers and a simple configuration API, it's a great choice for any project that requires user authentication.