Introduction to Authentication

Authentication is an essential feature for any application, as it provides a secure way for users to access protected resources.

Step 1: Create a New Next.js Project

Create a new Next.js project using npx create-next-app my-auth.

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

Step 2: Install Required Dependencies

Install the required dependencies, including @auth0/auth0-js and @auth0/auth0-react.

npm install @auth0/auth0-js @auth0/auth0-react

Step 3: Configure Auth0

Configure Auth0 by creating a new Auth0 application and installing the Auth0 SDK.

// lib/auth0.js
import { WebAuth } from '@auth0/auth0-js';

const auth0 = new WebAuth({
  domain: 'YOUR_AUTH0_DOMAIN',
  clientId: 'YOUR_AUTH0_CLIENT_ID',
  redirectUri: 'http://localhost:3000/callback',
  audience: 'https://YOUR_AUTH0_DOMAIN/api/v2/',
  scope: 'openid profile email',
});

export default auth0;

Step 4: Implement Authentication

Implement authentication using the Auth0 SDK.

// pages/index.js
import { useState, useEffect } from 'react';
import auth0 from '../lib/auth0';

const Home = () => {
  const [user, setUser] = useState(null);

useEffect(() => {
    const getUser = async () => {
      const user = await auth0.getUser();
      setUser(user);
    };
    getUser();
  }, []);

const handleLogin = () => {
    auth0.authorize();
  };

const handleLogout = () => {
    auth0.logout();
  };

return (
    <div>
      {user ? (
        <div>
          <p>Welcome, {user.name}!</p>
          <button onClick={handleLogout}>Logout</button>
        </div>
      ) : (
        <button onClick={handleLogin}>Login
      )}
    
  );
};

  ;

Conclusion

In this tutorial, you learned how to implement authentication with Next.js and Auth0.