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Table of Contents
Setting Up NextAuth.js in a Next.js App
Adding Sign In / Sign Out Buttons
Protecting Routes and Middleware
Option 1: Protect a Page Using Server Component
Option 2: Use Middleware (Recommended for Global Protection)
Extending Session Data (Optional)
Supporting Email/Password Login
Using a Database (Optional but Recommended)
Home Web Front-end Front-end Q&A Implementing Authentication with Next.js and NextAuth.js

Implementing Authentication with Next.js and NextAuth.js

Jul 30, 2025 am 04:29 AM
Authentication Next.js

Install next-auth and create API routing files app/api/auth/[...nextauth]/route.js Configure Google login and secret; 2. Set GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET, and NEXTAUTH_SECRET in .env.local; 3. Use the signIn and signOut methods to add login and logout buttons and wrap the application with SessionProvider; 4. Protect individual pages through getServerSession or use the withAuth middleware to protect specified routes; 5. Optionally extend session data, add user roles or IDs through callbacks; 6. Optionally use Credentials The provider supports email password login and requires back-end verification; 7. It is recommended to combine Prisma and @auth/prisma-adapter to persist user and session data to achieve a complete authentication system.

Implementing Authentication with Next.js and NextAuth.js

Implementing authentication in a Next.js app doesn't have to be complicated — NextAuth.js (now part of Auth.js ) makes it easy to add secure login, user sessions, and social or email/password sign-ins with minimal setup. Here's how to get it working quickly and correctly.

Implementing Authentication with Next.js and NextAuth.js

Setting Up NextAuth.js in a Next.js App

Start by installing the required packages:

 npm install next-auth

Next.js App Router (v13) uses route handlers. Create an API route for NextAuth under app/api/auth/[...nextauth]/route.js :

Implementing Authentication with Next.js and NextAuth.js
 import NextAuth from 'next-auth';
import GoogleProvider from 'next-auth/providers/google';

const handler = NextAuth({
  Providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_CLIENT_ID,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET,
    }),
  ],
  secret: process.env.NEXTAUTH_SECRET,
});

export { handler as GET, handler as POST };

? Make sure to set up your .env.local file with the required environment variables:

 GOOGLE_CLIENT_ID=your-google-client-id
GOOGLE_CLIENT_SECRET=your-google-client-secret
NEXTAUTH_SECRET=your-secure-secret-here

The NEXTAUTH_SECRET is critical — use a strong random string (generate one with openssl rand -base64 32 ).

Implementing Authentication with Next.js and NextAuth.js

Adding Sign In / Sign Out Buttons

Use the signIn() and signOut() methods from next-auth/react in your components:

 'use client';

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

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

  if (session) {
    Return (
      <div>
        <p>Welcome, {session.user?.email}</p>
        <button onClick={() => signOut()}>Sign Out</button>
      </div>
    );
  }

  Return (
    <button onClick={() => signIn(&#39;google&#39;)}>
      Sign In with Google
    </button>
  );
}

? Wrap your app with the SessionProvider in layout.js or RootLayout :

 import { SessionProvider } from &#39;next-auth/react&#39;;

export default function RootLayout({ children }) {
  Return (
    <html lang="en">
      <body>
        <SessionProvider>{children}</SessionProvider>
      </body>
    </html>
  );
}

Protecting Routes and Middleware

To protect certain pages from unauthenticated users, check session status in a Server Component or via middleware.

Option 1: Protect a Page Using Server Component

 import { getServerSession } from &#39;next-auth&#39;;
import { redirect } from &#39;next/navigation&#39;;

export default async function Dashboard() {
  const session = await getServerSession();

  if (!session) {
    redirect(&#39;/api/auth/signin&#39;);
  }

  return <div>Protected Dashboard</div>;
}

Create middleware.js in the root or app directory:

 import { withAuth } from &#39;next-auth/middleware&#39;;

export default withAuth({
  pages: {
    signIn: &#39;/login&#39;,
  },
});

// Apply middleware only to specific routes
export const config = {
  matcher: [&#39;/dashboard&#39;, &#39;/profile/:path*&#39;],
};

This protects /dashboard and any /profile/... routes unless the user is signed in.

Extending Session Data (Optional)

By default, the session only includes basic user info. To add more (like role or ID), use callbacks:

 const handler = NextAuth({
  Providers: [...],
  callbacks: {
    async session({ session, token }) {
      session.user.id = token.sub;
      session.user.role = token.role || &#39;user&#39;;
      return session;
    },
    async jwt({ token, user }) {
      if (user) {
        token.role = user.role; // assuming you store role in your DB
      }
      return token;
    },
  },
});

Now session.user.id and session.user.role are available client-side.

Supporting Email/Password Login

Enable credentials using the Credentials provider (note: not recommended alone without backend validation):

 import CredentialsProvider from &#39;next-auth/providers/credentials&#39;;

CredentialsProvider({
  name: &#39;Credentials&#39;,
  credentials: {
    email: { label: &#39;Email&#39;, type: &#39;email&#39; },
    password: { label: &#39;Password&#39;, type: &#39;password&#39; },
  },
  async authorize(credentials) {
    // Add logic to verify credentials against your database
    const user = await verifyUser(credentials.email, credentials.password);
    return user ? { id: &#39;1&#39;, name: user.name, email: user.email } : null;
  },
}),

?? This method doesn't create real sessions by itself — always validate securely and consider combining with a database adapter.

To persist users, link a database using Prisma and an adapter:

 npm install prisma @prisma/client @auth/prisma-adapter

Update your NextAuth config:

 import { PrismaAdapter } from &#39;@auth/prisma-adapter&#39;;
import { PrismaClient } from &#39;@prisma/client&#39;;

const prisma = new PrismaClient();

const handler = NextAuth({
  adapter: PrismaAdapter(prisma),
  Providers: [...],
});

This enables user creation, session storage, and account linking.

Basically, that's it. With just a few files and solid environment setup, you've got secure, scalable auth in your Next.js app — supporting social logins, protected routes, and even database persistence. Not magic, just well-designed tools working together.

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