Web Developers : 10-Integrate Fauna with Auth0 for Authentication in a Next.js Application

Screenshot from the tutorial

Integrating Fauna with Auth0 for Authentication in a Next.js Application

In the ever-evolving landscape of web development, securing applications efficiently is paramount. If you’re a web developer looking to enhance your Next.js application with robust authentication, integrating FaunaDB with Auth0 is a powerful choice. In this tutorial, we'll walk you through the process of setting up authentication in your Next.js application using these two technologies.

What You Will Learn

• An overview of FaunaDB and Auth0
• Setting up a Next.js application
• Configuring Auth0 for authentication
• Integrating FaunaDB to manage user data
• Implementing authentication in your Next.js application

Prerequisites

Before we begin, ensure you have the following:

• Basic knowledge of JavaScript and React
• Node.js installed on your machine
• An Auth0 account
• A FaunaDB account

Step 1: Setting Up Your Next.js Application

First, let's create a new Next.js application. Open your terminal and run the following command:

npx create-next-app my-nextjs-app

Navigate to your application directory:

cd my-nextjs-app

Step 2: Configuring Auth0

Create an Auth0 Application

1. Log into your Auth0 dashboard.
2. Navigate to the Applications section and click on Create Application.
3. Choose a name for your application, select Single Page Web Applications, and click Create.

Configure Application Settings

• In the settings tab, note your Domain, Client ID, and Client Secret.
• Set the Allowed Callback URLs to http://localhost:3000/api/auth/callback.
• Set the Allowed Logout URLs to http://localhost:3000/.
• Set the Allowed Web Origins to http://localhost:3000.

Install Auth0 SDK

Inside your project directory, install the Auth0 SDK:

npm install @auth0/nextjs-auth0

Step 3: Setting Up FaunaDB

Create a FaunaDB Database

1. Log into your FaunaDB account.
2. Create a new database for your application.
3. Generate a new secret key for your database.

Configure FaunaDB with Your Next.js Application

Install the FaunaDB driver:

npm install faunadb

Create a Fauna Client

Create a new file called faunaClient.js in the root directory of your project:

// faunaClient.js
import faunadb from 'faunadb';

const q = faunadb.query;
const client = new faunadb.Client({ secret: process.env.FAUNADB_SECRET });

export { client, q };

Make sure to set your FaunaDB secret in your environment variables. Create a .env.local file in the root of your project:

FAUNADB_SECRET=your_fauna_secret

Step 4: Implementing Authentication in Next.js

Create API Routes for Auth0

In the pages/api directory, create a new folder named auth. Inside this folder, create three files: login.js, logout.js, and callback.js.

login.js

// pages/api/auth/login.js
import { handleAuth, handleLogin } from '@auth0/nextjs-auth0';

export default handleAuth({
  login: handleLogin({ redirectTo: '/' }),
});

logout.js

// pages/api/auth/logout.js
import { handleAuth, handleLogout } from '@auth0/nextjs-auth0';

export default handleAuth({
  logout: handleLogout({ returnTo: '/' }),
});

callback.js

// pages/api/auth/callback.js
import { handleAuth, handleCallback } from '@auth0/nextjs-auth0';

export default handleAuth({
  callback: handleCallback(),
});

Step 5: Connecting FaunaDB with Auth0

Create User Collection in FaunaDB

In your FaunaDB dashboard, create a new collection called users to store user information.

Save User Data in FaunaDB

In your callback.js file, you can save authenticated user data to FaunaDB:

import { client, q } from '../../../faunaClient';
import { handleAuth, handleCallback } from '@auth0/nextjs-auth0';

export default handleAuth({
  callback: async (req, res) => {
    await handleCallback(req, res, async (session) => {
      const { user } = session;

      // Save user to FaunaDB
      await client.query(
        q.Create(q.Collection('users'), {
          data: { email: user.email, name: user.name },
        })
      );

      return session;
    });
  },
});

Step 6: Using Authentication in Your Application

Now that everything is set up, you can use the Auth0 session in your application. For example, in your pages/index.js file, you can check if a user is authenticated:

// pages/index.js
import { useUser } from '@auth0/nextjs-auth0';

export default function Home() {
  const { user, error, isLoading } = useUser();

  if (isLoading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;

  return (
    <div>
      {user ? (
        <div>
          <h1>Welcome, {user.name}</h1>
          <a href="/api/auth/logout">Logout</a>
        </div>
      ) : (
        <a href="/api/auth/login">Login</a>
      )}
    </div>
  );
}

Conclusion

In this tutorial, we explored how to integrate FaunaDB with Auth0 for authentication in a Next.js application. By following these steps, you now have a basic setup for user authentication, enabling you to manage user data securely in your FaunaDB database.

Feel free to extend this setup further by adding more features like role management, password reset, or social login options. Happy coding!

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