Friday, June 21, 2024

Build a login system in a Next.js application using Auth0

Build a login system in a Next.js application using Auth0

To build a login system in a Next.js application using Auth0, you’ll need to integrate Auth0’s authentication service. Auth0 provides a powerful and flexible platform for authentication and authorization that supports a variety of methods including social login, passwordless, and more.

Here’s a step-by-step guide on how to set up a simple login system in a Next.js app using Auth0:

Next.js auth0
Next.js auth0

1. Set Up Auth0

First, you need to set up an Auth0 account and application:

  1. Create an Auth0 Account: Go to Auth0’s website and sign up.
  2. Create a New Application: In the Auth0 dashboard, create a new application and select “Single Page Web Applications”.
  3. Configure Application Settings:
    • Allowed Callback URLs: Add http://localhost:3000/api/auth/callback.
    • Allowed Logout URLs: Add http://localhost:3000/.
    • Allowed Web Origins: Add http://localhost:3000.

2. Install Necessary Packages

Install the Auth0 SDK for Next.js:

npm install @auth0/nextjs-auth0

3. Configure Auth0 SDK

Create an .env.local file in the root of your Next.js project and add your Auth0 credentials:


You can generate AUTH0_SECRET using a tool like OpenSSL:

openssl rand -hex 32

4. Create API Routes

In your Next.js project, create the /pages/api/auth/[...auth0].js file. This file will handle the authentication flow:

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

export default handleAuth();

5. Using the Auth0 Hook

In your components, use the Auth0 hook to manage authentication. For example, create a /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.message}</div>;

  return (
      {user ? (
          <h1>Welcome {}!</h1>
          <p>You're logged in!</p>
          <a href="/api/auth/logout">Logout</a>
      ) : (
        <a href="/api/auth/login">Login</a>

6. Protecting Routes

To protect routes, you can use the withPageAuthRequired higher order function:

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

export const getServerSideProps = withPageAuthRequired();

export default function ProtectedPage() {
  return <div>Protected content here!</div>;

7. Run Your Application

Start your Next.js application:

npm run dev

Navigate to http://localhost:3000 to see the login system in action.

By following these steps, you can effectively integrate Auth0 into a Next.js application, providing a secure and scalable authentication solution for your users.



the authortherichpost
Hello to all. Welcome to Myself Ajay Malhotra and I am freelance full stack developer. I love coding. I know WordPress, Core php, Angularjs, Angular 14, Angular 15, Angular 16, Angular 17, Bootstrap 5, Nodejs, Laravel, Codeigniter, Shopify, Squarespace, jQuery, Google Map Api, Vuejs, Reactjs, Big commerce etc.

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