@auth0/nextjs-auth0

The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications.

📚 Documentation - 🚀 Getting Started - 💻 API Reference - 💬 Feedback

Documentation

• QuickStart- our guide for adding Auth0 to your Next.js app.
• Examples - lots of examples for your different use cases.
• Security - Some important security notices that you should check.
• Docs Site - explore our docs site and learn more about Auth0.

Getting Started

1. Install the SDK

npm i @auth0/nextjs-auth0

This library requires Node.js 20 LTS and newer LTS versions.

2. Add the environment variables

Add the following environment variables to your .env.local file:

AUTH0_DOMAIN=
AUTH0_CLIENT_ID=
AUTH0_CLIENT_SECRET=
AUTH0_SECRET=
APP_BASE_URL=

The AUTH0_DOMAIN, AUTH0_CLIENT_ID, and AUTH0_CLIENT_SECRET can be obtained from the Auth0 Dashboard once you've created an application. This application must be a Regular Web Application.

The AUTH0_SECRET is the key used to encrypt the session and transaction cookies. You can generate a secret using openssl:

openssl rand -hex 32

The APP_BASE_URL is the URL that your application is running on. When developing locally, this is most commonly http://localhost:3000.

[!IMPORTANT]
You will need to register the follwing URLs in your Auth0 Application via the Auth0 Dashboard:

• Add http://localhost:3000/auth/callback to the list of Allowed Callback URLs
• Add http://localhost:3000 to the list of Allowed Logout URLs

3. Create the Auth0 SDK client

Create an instance of the Auth0 client. This instance will be imported and used in anywhere we need access to the authentication methods on the server.

Add the following contents to a file named lib/auth0.ts:

import { Auth0Client } from "@auth0/nextjs-auth0/server"

export const auth0 = new Auth0Client()

4. Add the authentication middleware

Create a middleware.ts file in the root of your project's directory:

import type { NextRequest } from "next/server"

import { auth0 } from "./lib/auth0"

export async function middleware(request: NextRequest) {
  return await auth0.middleware(request)
}

export const config = {
  matcher: [
    /*
     * Match all request paths except for the ones starting with:
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico, sitemap.xml, robots.txt (metadata files)
     */
    "/((?!_next/static|_next/image|favicon.ico|sitemap.xml|robots.txt).*)",
  ],
}

[!NOTE]
If you're using a src/ directory, the middleware.ts file must be created inside the src/ directory.

You can now begin to authenticate your users by redirecting them to your application's /auth/login route:

import { auth0 } from "@/lib/auth0"

export default async function Home() {
  const session = await auth0.getSession()

  if (!session) {
    return (
      <main>
        <a href="/auth/login?screen_hint=signup">Sign up</a>
        <a href="/auth/login">Log in</a>
      </main>
    )
  }

  return (
    <main>
      <h1>Welcome, {session.user.name}!</h1>
    </main>
  )
}

[!IMPORTANT]
You must use <a> tags instead of the <Link> component to ensure that the routing is not done client-side as that may result in some unexpected behavior.

Customizing the client

You can customize the client by using the options below:

Option	Type	Description
domain	string	The Auth0 domain for the tenant (e.g.: example.us.auth0.com or https://example.us.auth0.com). If it's not specified, it will be loaded from the AUTH0_DOMAIN environment variable.
clientId	string	The Auth0 client ID. If it's not specified, it will be loaded from the AUTH0_CLIENT_ID environment variable.
clientSecret	string	The Auth0 client secret. If it's not specified, it will be loaded from the AUTH0_CLIENT_SECRET environment variable.
authorizationParameters	AuthorizationParameters	The authorization parameters to pass to the /authorize endpoint. See Passing authorization parameters for more details.
clientAssertionSigningKey	string or CryptoKey	Private key for use with private_key_jwt clients. This can also be specified via the AUTH0_CLIENT_ASSERTION_SIGNING_KEY environment variable.
clientAssertionSigningAlg	string	The algorithm used to sign the client assertion JWT. This can also be provided via the AUTH0_CLIENT_ASSERTION_SIGNING_ALG environment variable.
appBaseUrl	string	The URL of your application (e.g.: http://localhost:3000). If it's not specified, it will be loaded from the APP_BASE_URL environment variable.
secret	string	A 32-byte, hex-encoded secret used for encrypting cookies. If it's not specified, it will be loaded from the AUTH0_SECRET environment variable.
signInReturnToPath	string	The path to redirect the user to after successfully authenticating. Defaults to /.
session	SessionConfiguration	Configure the session timeouts and whether to use rolling sessions or not. See Session configuration for additional details.
beforeSessionSaved	BeforeSessionSavedHook	A method to manipulate the session before persisting it. See beforeSessionSaved for additional details.
onCallback	OnCallbackHook	A method to handle errors or manage redirects after attempting to authenticate. See onCallback for additional details.
sessionStore	SessionStore	A custom session store implementation used to persist sessions to a data store. See Database sessions for additional details.
pushedAuthorizationRequests	boolean	Configure the SDK to use the Pushed Authorization Requests (PAR) protocol when communicating with the authorization server.
routes	Routes	Configure the paths for the authentication routes. See Custom routes for additional details.
allowInsecureRequests	boolean	Allow insecure requests to be made to the authorization server. This can be useful when testing with a mock OIDC provider that does not support TLS, locally. This option can only be used when NODE_ENV is not set to production.
httpTimeout	number	Integer value for the HTTP timeout in milliseconds for authentication requests. Defaults to 5000 milliseconds
enableTelemetry	boolean	Boolean value to opt-out of sending the library name and version to your authorization server via the Auth0-Client header. Defaults to true.

Routes

The SDK mounts 6 routes:

• /auth/login: the login route that the user will be redirected to to start a initiate an authentication transaction
• /auth/logout: the logout route that must be addedto your Auth0 application's Allowed Logout URLs
• /auth/callback: the callback route that must be addedto your Auth0 application's Allowed Callback URLs
• /auth/profile: the route to check the user's session and return their attributes
• /auth/access-token: the route to check the user's session and return an access token (which will be automatically refreshed if a refresh token is available)
• /auth/backchannel-logout: the route that will receive a logout_token when a configured Back-Channel Logout initiator occurs

Feedback

Contributing

We appreciate feedback and contribution to this repo! Before you get started, please read the following:

• Auth0's general contribution guidelines
• Auth0's code of conduct guidelines
• This repo's contribution guide

Raise an issue

To provide feedback or report a bug, please raise an issue on our issue tracker.

Vulnerability Reporting

Please do not report security vulnerabilities on the public GitHub issue tracker. The Responsible Disclosure Program details the procedure for disclosing security issues.

What is Auth0?

Auth0 is an easy to implement, adaptable authentication and authorization platform. To learn more checkout Why Auth0?

This project is licensed under the MIT license. See the LICENSE file for more info.

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