Thursday May 20, 2021 By David Quintanilla
How To Implement Authentication In Next.js With Auto0 — Smashing Magazine

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Techniques Engineer from Buenos Aires, Argentina, with 15+ years of expertise in software program improvement. Full Stack Developer. Auth0 Ambassador. GitKraken …
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For the time being of including authentication and authorization to our internet functions, 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 are able to depend on an current third-party service. Let’s see how we are able to implement authentication and authorization in Subsequent.js apps, with Auth0.

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

“Authorization” determines what a consumer can (or can’t) do. If we have to deal with authentication and authorization in our internet utility, we are going to want a safety platform or module. We will develop our personal platform, implement it, and keep it. Or we are able to take the benefit of current authentication and authorization platforms available in the market which can 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 contemplate:

  • Designing and creating authentication providers just isn’t our core talent. There are folks working specifically targeted on safety matters that may create higher and safer platforms than us;
  • We will save time counting on an current authentication platform and spend it including worth to the services and products that we care about;
  • We don’t retailer delicate info 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 components, we are able to 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 are going to see the best way to implement authentication and authorization in our Subsequent.js functions utilizing one of many current merchandise available in the market: Auth0.

What Is Auth0?

It lets you add safety to apps developed utilizing any programming language or expertise.

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

Dan Arias, auth0.com

Auth0 has a number of attention-grabbing options, resembling:

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

There’s a free plan that you should use to begin securing your internet functions, overlaying 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 out there to make use of in our app. With this library, created particularly for Subsequent.js, we are able to simply hook up 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 out there to hook up with the API utilizing numerous programming languages. We simply have to obtain the NPM package, configure some particulars about our Auth0 account and connection, and we’re good to go.

This SDK offers 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 the best way to use Auth0 Subsequent.js SDK. We’ll arrange Auth0’s Universal Login. We may have some YouTube video URLs. They are going to be hidden underneath an authentication platform. Solely registered customers will have the ability to see the listing of movies by our internet utility.

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

Create Auth0 Account And Configure App Particulars

To begin 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 Functions 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 applying and, underneath the Software 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 need 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 must 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 are able to apply to our tasks. We will 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 are going to use create-next-app, which units up every little thing routinely for you. To create the challenge, run:

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


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

To start out the develop server regionally and see the location simply created in your browser, go to the brand new folder that you just 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)

If you need extra configuration choices, you’ll be able to take a look at the docs.

Create the Dynamic API Route

Subsequent.js gives a strategy to create serverless APIs: API Routes. With this function, we are able to create code that can be executed in each consumer request to our routes. We will outline fastened routes, like /api/index.js. However we are able to even have dynamic API routes, with params that we are able to 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 consequence:

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

export default handleAuth();

This can create and deal with the next routes:

  • /api/auth/login
    To carry out login or enroll with Auth0.
  • /api/auth/logout
    To log the consumer out.
  • /api/auth/callback
    To redirect the consumer after a profitable login.
  • /api/auth/me
    To get the consumer profile info.

And that will be the server-side a part of our app. If we need to log in to our utility or join a brand new account, we must always go to http://localhost:3000/api/auth/login. We must 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 consumer authentication state on the frontend of our internet utility we are able to use UserProvider React part, out there on Auth0 Subsequent.js SDK. the part makes use of React Context internally.

If you wish to entry the consumer authentication state on a Element, it is best to wrap it with a UserProvider part.

  <Element {...props} />

If we need to entry the entire pages in our utility, we must always add the part to the pages/_app.js file. pages/_app.js overrides the React App part. 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 operate App({ Element, pageProps }) {
  return (
      <Element {...pageProps} />

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

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

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

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

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

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

The consumer object comprises info associated to the consumer’s identification. If the individual visiting the web page just isn’t logged in (we don’t have a consumer object out there), we are going to show a hyperlink to the login web page. If the consumer is already authenticated, we are going to show consumer.identify and consumer.e-mail properties on the web page, and a Logout hyperlink.

Let’s create a movies.js file, with a listing of three YouTube video URLs that can solely be seen for registered folks. To solely permit logged customers to see this web page, we are going to 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();

Consider that our internet utility permits any individual to enroll in an account, utilizing the Auth0 platform. The consumer can even re-use an current Auth0 account, as we’re implementing Common Login.

We will create our personal registration web page to request extra particulars in regards to the consumer or add fee info to invoice them month-to-month for our service. We will additionally use the strategies uncovered within the SDK to deal with authorization in an automated method.


On this article, we noticed the best way to safe our Subsequent.js functions utilizing Auth0, an authentication and authorization platform. We consider the advantages of utilizing a third-party service for the authentication of our internet functions 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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