How to use the useSession hook with JWT tokens in Next.js

In Next.js, you can use the useSession hook from the next-auth library to handle authentication and work with JWT tokens. Here's a step-by-step guide on how to use the useSession hook with JWT tokens in Next.js:

1. Install Required Packages: Ensure you have the necessary packages installed. Install next-auth and any other dependencies you may need for authentication:

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   npm install next-auth
   

2. Configure NextAuth: Set up NextAuth in your Next.js project by creating a next-auth.config.js file at the root level:

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   // next-auth.config.js
   export default {
     providers: [
       // Add your authentication providers here (e.g., Google, GitHub, etc.),
       // or use JWT as a custom provider.
     ],
     pages: {
       signIn: '/auth/signin',
       signOut: '/auth/signout',
       error: '/auth/error',
       // Add custom pages as needed.
     },
     callbacks: {
       async jwt(token, user) {
         // Initial setup of the token.
         if (user) {
           token.id = user.id;
         }
         return token;
       },
     },
   };
   

   Customize the configuration according to your authentication providers.

3. Create Auth Pages: Create pages for authentication, such as pages/auth/signin.js and pages/auth/signout.js. Customize these pages based on your application's needs.

4. Use useSession in Your Components: In your components, you can use the useSession hook to check if the user is authenticated. Import and use it like this:

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   // YourComponent.js
   import { useSession } from 'next-auth/react';
   
   const YourComponent = () => {
     const { data: session } = useSession();
   
     if (session) {
       // User is authenticated, perform authenticated actions.
       console.log('Authenticated user:', session.user);
     } else {
       // User is not authenticated, handle accordingly.
       console.log('User not authenticated');
     }
   
     return (
       <div>
         {/* Your component content */}
       </div>
     );
   };
   
   export default YourComponent;
   

   The session object contains user information when the user is authenticated.

5. Secure API Routes: If you have API routes that require authentication, you can secure them by using the getSession function:

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   // pages/api/secure.js
   import { getSession } from 'next-auth/react';
   
   export default async function handler(req, res) {
     const session = await getSession({ req });
   
     if (!session) {
       res.status(401).json({ error: 'Unauthorized' });
       return;
     }
   
     // Your secure API route logic here.
     res.status(200).json({ message: 'Secure API route response' });
   }
   

   This ensures that only authenticated users can access the secure API route.

Remember to adjust the configuration and implementation based on your specific use case and authentication providers. The steps provided above assume a basic setup; you might need additional customization based on your project's requirements.