Auth0 Next.Js Authentication: A Complete 2024 Guide

Authentication, the process of confirming a user’s identity, is essential for web applications. It typically involves verifying credentials, such as usernames and passwords, or utilizing advanced methods like facial recognition. On the other hand, authorization dictates what actions a user can perform within the application.

When it comes to handling authentication and authorization, developers face a choice: build their own security platform or leverage third-party services. Creating authentication services requires specific expertise and maintenance efforts. Alternatively, utilizing existing authentication platforms, such as Auth0, offers numerous advantages.

Factors such as specialized security expertise, time-saving opportunities, data security, and enhanced usability make third-party authentication platforms an attractive option. In this article, we’ll explore implementing authentication and authorization in Next.js applications using Auth0, a leading solution on the market.

• What is Auth0?
• How To Start With Auth0
• Creating An Auth0 Account And Configuring App Details
• How To Create Next.js App
• Installing And Configuring The Auth0 Next.js SDK
• Adding The UserProvider Component

What is Auth0?

Auth0 comes out as a platform that is flexible and easy to use. It is made to make it easier to set up authentication and authorization services. According to Dan Arias, this platform is a “drop-in solution” because it has all the tools and features you need to make your apps safer.

Key Features Of Auth0

Single Sign-On (SSO)

Auth0 makes things easier for users by allowing Single Sign-On. Once a person has logged in to one Auth0-connected app, they can automatically access other apps that are linked without having to enter their login information again.

Social Login

Auth0 lets users log in with their favorite social network sites because it supports social login. This function not only makes it easier to log in, but it also makes the experience more fun and useful for users.

Multi-Factor Authentication (MFA)

Multi-Factor Authentication makes Auth0 safer by adding more security steps. Auth0 adds an extra layer of security against unauthorized entry by requiring verification steps other than passwords, like OTP codes or biometric authentication.

Standard Protocols Support

Auth0 works with a number of standard protocols, such as OAuth 2.0, OpenID Connect, and JSON Web Token. This provides flexibility and interoperability, so developers can use existing ways of authentication without any problems.

Reporting And Analytics

Auth0 gives developers powerful reporting and analytics tools that let them learn more about authentication actions and user behavior. Developers can improve system performance and find possible security holes before they happen by keeping an eye on authentication metrics.

How To Start With Auth0

Price And Free Plan

Auth0 has a free plan that works for small businesses and companies and allows up to 7,000 active users per month. As the number of users increases, there are different price plans that can be used, giving businesses the freedom to adapt to their changing needs.

SDK For Next.js For Auth0

Auth0 develops and updates a Next.js SDK and other SDKs for other programming languages. Developers can easily incorporate Auth0’s authentication and authorization capabilities into Next.js apps by installing the NPM package and creating an Auth0 account and connection.

The SDK gives developers everything they need to implement authentication and authorization smoothly. It supports client-side and server-side methods using API Routes for the backend and React Context with React Hooks for the frontend. Developers may protect and optimize Next.js apps by managing authentication and authorization with this SDK.

Creating An Auth0 Account And Configuring App Details

Sign Up For An Auth0 Account

To begin, navigate to the Auth0 website and proceed to the Sign Up page to create a new account. Provide the required information to register and create your account.

Access The Auth0 Dashboard

Once you’ve successfully created your Auth0 account, access the Auth0 Dashboard. From here, you’ll be able to manage various aspects of your authentication setup.

Create A New Application

In the Auth0 Dashboard, locate the “Applications” section and proceed to create a new application. Choose the type of application as “Regular Web Applications” to suit your requirements.

Configure Application Settings

After creating the new application, navigate to the “Settings” tab within the application dashboard. Here, you’ll find various configuration options to customize your application’s behavior.

• Allowed Callback URLs: https://localhost:3000/api/auth/callback
• Allowed Logout URLs: https://localhost:3000/
• 

Save Changes

Once you’ve configured the necessary details, ensure to save the changes made to your application settings. This ensures that the configured URLs are properly set up for authentication and logout purposes.

Additional Configuration Options

The Auth0 Dashboard offers a plethora of additional configurations and customizations to fine-tune your authentication setup. You can explore options such as changing authentication methods, customizing login/sign-up pages, managing user data, enabling/disabling new registrations, and configuring user databases to suit your specific requirements.

By leveraging the functionalities and customization options provided by the Auth0 Dashboard, you can tailor your authentication setup to meet the unique needs of your web application effectively.

How To Create Next.js App

To initiate a new Next.js application, utilize the “create-next-app” command, which automates the setup process. 

Execute the following command to create your project:

npx create-next-app [name-of-the-app]

Alternatively, if you prefer to use Yarn, you can run:

yarn create next-app [name-of-the-app]

Once the project is created, navigate to the newly generated folder by using the following command:

cd [name-of-the-app]

To launch the development server and view the newly created site in your browser, execute the command:

npm run dev 

Or, if you’re using Yarn:

yarn dev

Following these steps will enable you to set up and run a Next.js application locally for development purposes.

Installing And Configuring The Auth0 Next.js SDK

Installation of Auth0 Next.js SDK

To integrate Auth0 authentication into our Next.js application, we first need to install the Auth0 Next.js SDK. This can be accomplished by running either of the following commands, depending on your preferred package manager:npm install @auth0/nextjs-auth0

npm install @auth0/nextjs-auth0

Or

yarn add @auth0/nextjs-auth0

yarn add @auth0/nextjs-auth0

Configuration

Once the SDK is installed, we need to configure our environment to utilize Auth0. This involves adding specific variables to our environment file (usually named env.local) or configuring them directly in the environment variables menu of our hosting platform.

The necessary configuration variables include:

• AUTH0_SECRET: A 32-character secret used to encrypt cookies.
• AUTH0_BASE_URL: The base URL of our application, typically https://localhost:3000.
• AUTH0_ISSUER_BASE_URL: The issuer base URL, which can be found in the Auth0 dashboard under settings. It typically resembles https://[Your tenant domain].
• AUTH0_CLIENT_ID: The client ID, which can also be found in the Auth0 dashboard under settings.
• AUTH0_CLIENT_SECRET: The client secret, obtained from the Auth0 dashboard under settings.

Ensure to populate these variables with the appropriate values to enable proper authentication with Auth0.

Creating The Dynamic API Route

Next.js provides a convenient way to create serverless APIs through its API Routes feature. This allows us to define server-side logic that executes upon each request to specific routes. In this case, we’ll create a dynamic API route to handle authentication-related tasks.

Create The Route

To create the dynamic API route, navigate to the “/pages/api/auth” directory in your Next.js project. Inside this directory, create a new file named […auth0].js.

Implement Authentication Logic

Within the […auth0].js file, import the handleAuth method from the Auth0 SDK. Then, export this method to define the functionality of our dynamic API route. This method will automatically handle various authentication-related tasks, including login, logout, callback after successful login, and fetching user profile information.

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

export default handleAuth();

This automatically creates and handles the following routes:

• /api/auth/login: Used for login or sign up with Auth0.
• /api/auth/logout: Used to log the user out.
• /api/auth/callback: Redirects the user after a successful login.
• /api/auth/me: Retrieves the user’s profile information.

Integration With The Application

Upon implementing the dynamic API route, we’ve established the server-side functionality of our application. To access the authentication features, users can navigate to specific routes. For logging in or signing up, users should visit https://localhost:3000/api/auth/login. Likewise, to log out from the site, users can access https://localhost:3000/api/auth/logout. It’s essential to incorporate links to these routes within our application to facilitate user interaction with the authentication process.

Adding The UserProvider Component

To manage user authentication state on the frontend of our web application, we utilize the UserProvider React component provided by the Auth0 Next.js SDK. This component leverages React Context internally to handle authentication-related operations.

If you wish to access the user authentication state within a component, it should be wrapped with the UserProvider component as shown below:

<UserProvider>
 <Component {...props} />
</UserProvider>

To ensure that the UserProvider component is accessible across all pages of our application, we include it in the pages/_app.js file. This file overrides the default React App component, allowing us to customize our application behavior. Here’s an example of how to integrate the UserProvider component into pages/_app.js:

import React from 'react';
import { UserProvider } from '@auth0/nextjs-auth0';

export default function App({ Component, pageProps }) {
 return (
 <UserProvider>
 <Component {...pageProps} />
 </UserProvider>
 );
}

Additionally, the Auth0 Next.js SDK provides a React hook called useUser to access the authentication state exposed by the UserProvider. We can utilize this hook to implement features such as a welcome page based on the user’s authentication status. Here’s a code snippet demonstrating how to use the useUser hook in the pages/index.js file:

import { useUser } from "@auth0/nextjs-auth0";

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

 if (isLoading) return <div>Loading...</div>;

 if (error) return <div>{error.message}</div>;

 if (user) {
 return (
 <div>
 <h2>{user.name}</h2>
 <p>{user.email}</p>
 <a href="/api/auth/logout">Logout</a>
 </div>
 );
 }
 return <a href="/api/auth/login">Login</a>;
};

Furthermore, we can restrict access to certain pages based on the user’s authentication status by using the withPageAuthRequired method from the SDK. This ensures that only authenticated users can view specific pages. For example, the videos.js file demonstrates how to create a page with restricted access to logged-in users only.

Conclusion

Auth0 authentication and authorization in Next.js applications provides a secure and easy way to secure your web application. Developers can easily manage user authentication, authorization, and access control while focusing on value-added services with Auth0’s comprehensive capabilities and easy-to-use SDK.

Developers can quickly handle frontend user authentication state with the Auth0 Next.js SDK’s UserProvider component and useUser hook. They can customize user experiences based on authentication status by wrapping components with the UserProvider and using the useUser hook.

When implementing Auth0 authentication into Next.js applications, consider partnering with a reliable next.js development company like Appic Softwares. We offer our experienced developers on an hourly basis or we can even take on the entire project. With a track record of delivering high-quality Next.js solutions, our team at Appic Softwares is ready to tackle your project and ensure its success.

Contact Us today to use our Next.js development skills to secure and improve your online apps using Auth0 authentication.