what is auth0

Auth0 is a cloud-based identity and access management platform that provides developers with the tools to add authentication and authorization capabilities to their applications. It allows developers to easily and securely manage user authentication and authorization, including user registration, password reset, and social login, without having to build their own authentication system from scratch. Auth0 provides support for multiple authentication protocols, such as OAuth 2.0, OpenID Connect, SAML, and others, making it easy for developers to integrate with different systems and services. It also offers features such as multifactor authentication, user management, and security analytics. Auth0 is used by thousands of companies and organizations, including big names like Atlassian, Mozilla, and Siemens.

detailed steps to integrate auth0 to nextjs

• Create an account on auth0
• Default app will be created for you.
• In app settings, configure callback url (http://localhost:3000/api/auth/callback) and logout url (http://localhost:3000)
• Install auth0 - npm install @auth0/nextjs-auth0
• Add environment variables in .env.local
• To create auth0 secret, you can use command "openssl rand -hex 32"

AUTH0_SECRET='9febe1e88789374dcab3906730749384795a1'
AUTH0_BASE_URL='http://localhost:3000'
AUTH0_ISSUER_BASE_URL='https://dev-uytsdsdoirgthw.us.auth0.com'
AUTH0_CLIENT_ID='flch7Gsdkjlkf689sd909sd3Fii9iy2'
AUTH0_CLIENT_SECRET='5fkjf8pi7bhfjhflkdldeikdmsdsdCDZL5MsAJdkfjskjdskdjkTI'

• Create api route

// pages/api/auth/[...auth0].js
import { handleAuth } from "@auth0/nextjs-auth0";
export default handleAuth();

• Finally you need to wrap the app with UserProvider Component

import { UserProvider } from "@auth0/nextjs-auth0/client";

 <UserProvider>
        <Layout>
          <Component {...pageProps} />
        </Layout>
</UserProvider>

Testing login

You can use below routes

• /api/auth/login: Login.
• /api/auth/logout: Logout.
• /api/auth/callback: Redirect after login
• /api/auth/me: User info

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

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

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

  return (
    user && (
      <div>
        <img src={user.picture} />
        <h2>{user.name}</h2>
        <p>{user.email}</p>
      </div>
    )
  );
}

Errors

You may encounter errors like

No webpage was found for the web address: http://localhost:3000/api/auth/login 404

There are couple of reasons why this happens

• Ensure that file is created here - Do not make any spelling mistakes - pages/api/auth/[...auth0].js
• Ensure that in .env.local file all environment variables are stored in single quotes. Generally we do not put values within single quotes. But for auth0, it is necessary
• Finally make sure that you are using correct values and ports e.g. In auth0 settings, you need to configure redirect url and logout url. Make sure that url and port is correct. Some people forget to enter the port.

Deploying to production

• Deploy all variables with correct values
• Update urls in auth0