How to implement user authentication with NextAuth.js in Next.js



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NextAuth.js is a popular authentication library for Next.js that supports various authentication providers. To implement user authentication with NextAuth.js in a Next.js project, you can follow these steps:

Step 1: Set up a Next.js project

If you haven't already set up a Next.js project, you can do so by running the following commands:

bash
npx create-next-app my-next-auth-app
cd my-next-auth-app

Step 2: Install NextAuth.js

Next, install NextAuth.js and any authentication providers you plan to use. In this example, we'll use the default example with the GitHub provider:

bash
npm install next-auth
npm install @next-auth/github

Step 3: Configure NextAuth.js

Create a file named next-auth.js in the root of your project. This file will contain the configuration for NextAuth.js. Add the following content:

javascript
// next-auth.js

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

export default NextAuth({
  providers: [
    Providers.GitHub({
      clientId: process.env.GITHUB_CLIENT_ID,
      clientSecret: process.env.GITHUB_CLIENT_SECRET,
    }),
    // Add other providers as needed
  ],
  // Add additional NextAuth.js options as needed
});

Replace process.env.GITHUB_CLIENT_ID and process.env.GITHUB_CLIENT_SECRET with your GitHub OAuth App credentials. You can get these credentials by creating a new OAuth App in your GitHub account.

Step 4: Add API route for authentication

Create a new API route in the pages/api/auth/[...nextauth].js file. This file will handle authentication requests:

javascript
// pages/api/auth/[...nextauth].js

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

export default NextAuth({
  providers: [
    Providers.GitHub({
      clientId: process.env.GITHUB_CLIENT_ID,
      clientSecret: process.env.GITHUB_CLIENT_SECRET,
    }),
    // Add other providers as needed
  ],
  // Add additional NextAuth.js options as needed
});

Step 5: Update pages

Update your pages to use authentication. For example, in the pages/index.js file, you can display the user's information:

javascript
// pages/index.js

import { useSession, signIn, signOut } from 'next-auth/react';

export default function Home() {
  const { data: session } = useSession();

  return (
    <div>
      {!session ? (
        <button onClick={() => signIn('github')}>Sign in with GitHub</button>
      ) : (
        <>
          <p>Welcome, {session.user.name}!</p>
          <button onClick={() => signOut()}>Sign out</button>
        </>
      )}
    </div>
  );
}

Step 6: Run your Next.js app

Now, you can run your Next.js app:

bash
npm run dev

Visit http://localhost:3000 in your browser and test the authentication flow.

These are the basic steps to implement user authentication with NextAuth.js in a Next.js project. Depending on your specific requirements, you may need to customize the authentication flow and handle additional configurations. Refer to the NextAuth.js documentation for more details and customization options.




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