Authentication with Auth0 in Next.js

Posted in Javascript

Authentication is a critical aspect of many web applications. In this tutorial, we’ll explore how to add secure authentication to your Next.js application using Auth0, a powerful authentication and authorization platform.

Setting Up Auth0 for Your Next.js App

Step 1: Create an Auth0 Account

If you don’t have an Auth0 account, sign up for one at Auth0.

Step 2: Create a New Auth0 Application

Once logged in, create a new application in the Auth0 dashboard. Note down the Client ID and Domain, as you’ll need them later.

Step 3: Install Dependencies

Install the necessary Auth0 libraries for Next.js:

npm install @auth0/nextjs-auth0

Step 4: Configure Auth0

Create an auth0.js file in your project with the Auth0 configuration:

// utils/auth0.js

import { initAuth0 } from '@auth0/nextjs-auth0';

export default initAuth0({
  clientId: process.env.AUTH0_CLIENT_ID,
  clientSecret: process.env.AUTH0_CLIENT_SECRET,
  domain: process.env.AUTH0_DOMAIN,
  redirectUri: process.env.AUTH0_REDIRECT_URI,
  postLogoutRedirectUri: process.env.AUTH0_POST_LOGOUT_REDIRECT_URI,
  session: {
    cookieSecret: process.env.AUTH0_COOKIE_SECRET,
    cookieLifetime: 60 * 60 * 8,
    storeIdToken: false,
    storeAccessToken: false,
    storeRefreshToken: false,
  },
});

Step 5: Environment Variables

Set up environment variables in a .env.local file:

AUTH0_CLIENT_ID=your-client-id
AUTH0_CLIENT_SECRET=your-client-secret
AUTH0_DOMAIN=your-auth0-domain
AUTH0_REDIRECT_URI=http://localhost:3000/api/auth/callback
AUTH0_POST_LOGOUT_REDIRECT_URI=http://localhost:3000/
AUTH0_COOKIE_SECRET=your-cookie-secret

Step 6: Protect Your Routes

Wrap the pages that require authentication with the withPageAuthRequired higher-order component provided by Auth0:

// pages/protected.js

import { withPageAuthRequired } from '@auth0/nextjs-auth0';

const ProtectedPage = () => {
  return (
    <div>
      <h1>Protected Page</h1>
      {/* Your protected page content goes here */}
    </div>
  );
};

export default withPageAuthRequired(ProtectedPage);

Adding Authentication Buttons

You can also add authentication buttons to your components for user authentication:

// components/AuthButtons.js

import { useAuth } from '@auth0/nextjs-auth0';

const AuthButtons = () => {
  const { user, isLoading, loginWithRedirect, logout } = useAuth();

  return (
    <div>
      {isLoading ? (
        <p>Loading...</p>
      ) : user ? (
        <button onClick={() => logout({ returnTo: window.location.origin })}>Logout</button>
      ) : (
        <button onClick={() => loginWithRedirect()}>Login</button>
      )}
    </div>
  );
};

export default AuthButtons;

Conclusion

Integrating Auth0 into your Next.js application provides a robust solution for authentication and authorization. By following these steps, you can secure your Next.js app and control access to protected routes.

In the upcoming tutorials, we’ll explore more advanced topics, including continuous integration for Next.js applications.

Stay tuned for the next tutorial where we’ll focus on setting up continuous integration for your Next.js app.

Happy coding and secure authentication with Auth0!