Thursday May 20, 2021 By David Quintanilla
How To Implement Authentication In Next.js With Auth0 — Smashing Magazine

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Programs Engineer from Buenos Aires, Argentina, with 15+ years of expertise in software program improvement. Full Stack Developer. Auth0 Ambassador. GitKraken …
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In the mean time of including authentication and authorization to our internet purposes, there are some issues that we must always consider, e.g. whether or not we have to create our personal safety platform or whether or not we will depend on an current third-party service. Let’s see how we will implement authentication and authorization in Subsequent.js apps, with Auth0.

“Authentication” is the motion of validating {that a} person is who she or he claims to be. We often do that by implementing a credentials system, like person/password, safety questions, and even facial recognition.

“Authorization” determines what a person can (or can’t) do. If we have to deal with authentication and authorization in our internet utility, we’ll want a safety platform or module. We are able to develop our personal platform, implement it, and preserve it. Or we will take the benefit of current authentication and authorization platforms available in the market which might be supplied as providers.

When evaluating whether or not it’s higher for us to create our personal platform, or to make use of a third-party service, there are some issues that we must always take into account:

  • Designing and creating authentication providers is just not our core ability. There are folks working specifically targeted on safety matters that may create higher and safer platforms than us;
  • We are able to save time counting on an current authentication platform and spend it including worth to the services that we care about;
  • We don’t retailer delicate data in our databases. We separate it from all the info concerned in our apps;
  • The instruments third-party providers supply have improved usability and efficiency, which makes it simpler for us to administrate the customers of our utility.

Contemplating these elements, we will say that counting on third-party authentication platforms could be simpler, cheaper, and much more safe than creating our personal safety module.

On this article, we’ll see easy methods to implement authentication and authorization in our Subsequent.js purposes utilizing one of many current merchandise available in the market: Auth0.

What Is Auth0?

It permits you to add safety to apps developed utilizing any programming language or know-how.

“Auth0 is a versatile, drop-in resolution so as to add authentication and authorization providers to your purposes.”

Dan Arias, auth0.com

Auth0 has a number of attention-grabbing options, similar to:

  • Single Signal-On: When you log into an utility that makes use of Auth0, you received’t need to enter your credentials once more when getting into one other one which additionally makes use of it. You may be robotically logged in to all of them;
  • Social login: Authenticate utilizing your most popular social community profile;
  • Multi-Issue Authentication;
  • A number of normal protocols are allowed, similar to OpenID Join, JSON Internet Token, or OAuth 2.0;
  • Reporting and analytics instruments.

There’s a free plan that you need to use to begin securing your internet purposes, protecting as much as 7000 month-to-month lively customers. You’ll begin paying when the quantity of customers will increase.

One other cool factor about Auth0 is that we’ve a Next.js SDK obtainable to make use of in our app. With this library, created particularly for Subsequent.js, we will simply connect with the Auth0 API.

Auth0 SDK For Subsequent.js

As we talked about earlier than, Auth0 created (and maintains) a Subsequent.js targeted SDK, amongst different SDKs obtainable to hook up with the API utilizing varied programming languages. We simply must obtain the NPM package, configure some particulars about our Auth0 account and connection, and we’re good to go.

This SDK provides us instruments to implement authentication and authorization with each client-side and server-side strategies, utilizing API Routes on the backend and React Context with React Hooks on the frontend.

Let’s see how a few of them work in an instance Subsequent.js utility.

Instance Subsequent.js App Utilizing Auth0

Let’s return to our earlier video platform instance, and create a small app to point out easy methods to use Auth0 Subsequent.js SDK. We are going to arrange Auth0’s Universal Login. We can have some YouTube video URLs. They are going to be hidden below an authentication platform. Solely registered customers will be capable to see the record of movies by means of our internet utility.

Be aware: This text focuses on the configuration and use of Auth0 in your Subsequent.js utility. We received’t get into particulars like CSS styling or database utilization. If you wish to see the whole code of the instance app, you possibly can go to this GitHub repository.

Create Auth0 Account And Configure App Particulars

To start with, we have to create an Auth0 account utilizing the Sign Up page.

creation of an Auth0 account using the Sign Up page
(Large preview)

After that, let’s go to the Auth0 Dashboard. Go to Purposes and create a brand new app of kind [“Regular Web Applications”].

creation of a new app of type 'Regular Web Applications'.
(Large preview)

Now let’s go to the Settings tab of the appliance and, below the Utility URIs part, configure the next particulars and save the adjustments:

  • Allowed Callback URLs: add http://localhost:3000/api/auth/callback
  • Allowed Logout URLs: add http://localhost:3000/
Settings tab of the application.
(Large preview)

By doing this, we’re configuring the URL the place we wish to redirect the customers after they login our website (Callback), and the URL the place we redirect the customers after they sign off (Logout). We should always add the manufacturing URLs after we deploy the ultimate model of our app to the internet hosting server.

Auth0 Dashboard has many configurations and customizations we will apply to our initiatives. We are able to change the kind of authentication we use, the login/sign-up web page, the info we request for the customers, allow/disable new registrations, configure customers’ databases, and so forth.

Create Subsequent.js App

To create a model new Subsequent.js app, we’ll use create-next-app, which units up the whole lot robotically for you. To create the mission, run:

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


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

To begin the develop server regionally and see the location simply created in your browser, go to the brand new folder that you simply created:

cd [name-of-the-app]

And run:

npm run dev


yarn dev

Set up And Configure The Auth0 Subsequent.js SDK

Let’s set up the Auth0 Subsequent.js SDK in our app:

npm set up @auth0/nextjs-auth0


yarn add @auth0/nextjs-auth0

Now, in our env.native file (or the atmosphere variables menu of our internet hosting platform), let’s add these variables:

AUTH0_SECRET="[A 32 characters secret used to encrypt the cookies]"
AUTH0_ISSUER_BASE_URL="https://[Your tenant domain. Can be found in the Auth0 dashboard under settings]"
AUTH0_CLIENT_ID="[Can be found in the Auth0 dashboard under settings]"
AUTH0_CLIENT_SECRET="[Can be found in the Auth0 dashboard under settings]"
configuration options for the Auth0 Next.js SDK.
(Large preview)

In order for you extra configuration choices, you possibly can take a look at the docs.

Create the Dynamic API Route

Subsequent.js affords a strategy to create serverless APIs: API Routes. With this function, we will create code that can be executed in each person request to our routes. We are able to outline mounted routes, like /api/index.js. However we will even have dynamic API routes, with params that we will use in our API routes code, like /api/weblog/[postId].js.

Let’s create the file /pages/api/auth/[...auth0].js, which can be a dynamic API route. Within the file, let’s import the handleAuth methodology from the Auth0 SDK, and export the end result:

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

export default handleAuth();

It will create and deal with the next routes:

  • /api/auth/login
    To carry out login or join with Auth0.
  • /api/auth/logout
    To log the person out.
  • /api/auth/callback
    To redirect the person after a profitable login.
  • /api/auth/me
    To get the person profile data.

And that may be the server-side a part of our app. If we wish to log in to our utility or join a brand new account, we must always go to http://localhost:3000/api/auth/login. We should always add a hyperlink to that route in our app. Identical for logging out from our website: Add a hyperlink to http://localhost:3000/api/auth/logout.

Add The UserProvider Element

To deal with person authentication state on the frontend of our internet utility we will use UserProvider React element, obtainable on Auth0 Subsequent.js SDK. the element makes use of React Context internally.

If you wish to entry the person authentication state on a Element, it’s best to wrap it with a UserProvider element.

  <Element {...props} />

If we wish to entry the entire pages in our utility, we must always add the element to the pages/_app.js file. pages/_app.js overrides the React App element. It’s a function that Subsequent.js exposes to customise our utility. You may learn extra about it here.

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

export default perform App({ Element, pageProps }) {
  return (
      <Element {...pageProps} />

Now we have a React hook useUser that accesses to the authentication state uncovered by UserProvider. We are able to use it, as an illustration, to create a type of welcome web page. Let’s change the code of the pages/index.js file:

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

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

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

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

 if (person) {
   return (
       <p>{person.electronic mail}</p>
       <a href="https://smashingmagazine.com/api/auth/logout">Logout</a>
 return <a href="http://smashingmagazine.com/api/auth/login">Login</a>;

The person object accommodates data associated to the person’s identification. If the individual visiting the web page is just not logged in (we don’t have a person object obtainable), we’ll show a hyperlink to the login web page. If the person is already authenticated, we’ll show person.title and person.electronic mail properties on the web page, and a Logout hyperlink.

Let’s create a movies.js file, with an inventory of three YouTube video URLs that can solely be seen for registered folks. To solely enable logged customers to see this web page, we’ll use withPageAuthRequired methodology from the SDK.

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

export default () => {
 return (
     <a href="https://www.youtube.com/watch?v=5qap5aO4i9A">LoFi Music</a>
     <a href="https://www.youtube.com/watch?v=fEvM-OUbaKs">Jazz Music</a>
     <a href="https://www.youtube.com/watch?v=XULUBg_ZcAU">Piano Music</a>

export const getServerSideProps = withPageAuthRequired();

Think about that our internet utility permits any individual to enroll in an account, utilizing the Auth0 platform. The person may re-use an current Auth0 account, as we’re implementing Common Login.

We are able to create our personal registration web page to request extra particulars concerning the person or add cost data to invoice them month-to-month for our service. We are able to additionally use the strategies uncovered within the SDK to deal with authorization in an automated manner.


On this article, we noticed easy methods to safe our Subsequent.js purposes utilizing Auth0, an authentication and authorization platform. We consider the advantages of utilizing a third-party service for the authentication of our internet purposes in comparison with creating our personal safety platform. We created an instance Subsequent.js app and we secured it utilizing Auth0 free plan and Auth0 Subsequent.js SDK.

If you wish to deploy an Auth0 instance utility to Vercel, you are able to do it here.

Additional Studying And Assets

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