How To Implement Authentication In Subsequent.js With Auto0

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“Authentication” is the motion of validating {that a} person is who she or he claims to be. We normally 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 net software, we are going to 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 present authentication and authorization platforms available in the market which can be provided as companies.

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 companies is just not our core talent. There are folks working specifically centered on safety subjects that may create higher and safer platforms than us;
We are able to save time counting on an present authentication platform and spend it including worth to the services 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 companies supply have improved usability and efficiency, which makes it simpler for us to administrate the customers of our software.

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

On this article, we are going to see find out how to implement authentication and authorization in our Subsequent.js functions utilizing one of many present merchandise available in the market: Auth0.

What Is Auth0?

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

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

Dan Arias,

Auth0 has a number of fascinating options, reminiscent of:

Single Signal-On: When you log into an software that makes use of Auth0, you gained’t must enter your credentials once more when coming into one other one which additionally makes use of it. You’ll 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, reminiscent of OpenID Join, JSON Net Token, or OAuth 2.0;
Reporting and analytics instruments.

There’s a free plan that you need to use to start out securing your net functions, overlaying as much as 7000 month-to-month energetic customers. You’ll begin paying when the quantity of customers will increase.

One other cool factor about Auth0 is that we now have a Subsequent.js SDK out there to make use of in our app. With this library, created particularly for Subsequent.js, we will 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 centered SDK, amongst different SDKs out there to hook up with the API utilizing numerous programming languages. We simply must obtain the NPM package deal, 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 software.

Instance Subsequent.js App Utilizing Auth0

Let’s return to our earlier video platform instance, and create a small app to indicate find out how to use Auth0 Subsequent.js SDK. We’ll arrange Auth0’s Common Login. We could have some YouTube video URLs. They are going to be hidden beneath an authentication platform. Solely registered customers will have the ability to see the listing of movies via our net software.

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

Create Auth0 Account And Configure App Particulars

Initially, we have to create an Auth0 account utilizing the Signal Up web page.

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

Now let’s go to the Settings tab of the appliance and, beneath the Software URIs part, configure the next particulars and save the modifications:

Allowed Callback URLs: add http://localhost:3000/api/auth/callback
Allowed Logout URLs: add http://localhost:3000/

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 must always add the manufacturing URLs once 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 are going to use create-next-app, which units up every little thing robotically for you. To create the challenge, 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 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 setting 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]”

In order for you extra configuration choices, you possibly can check out the docs.

Create the Dynamic API Route

Subsequent.js provides a approach 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 fastened 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 technique 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:

To carry out login or join with Auth0.
To log the person out.
To redirect the person after a profitable login.
To get the person profile info.

And that might be the server-side a part of our app. If we wish to log in to our software 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. Similar for logging out from our website: Add a hyperlink to http://localhost:3000/api/auth/logout.

Add The UserProvider Part

To deal with person authentication state on the frontend of our net software we will 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 person authentication state on a Part, you must wrap it with a UserProvider part.

<Part {…props} />

If we wish to entry the entire pages in our software, 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 software. You may learn extra about it right here.

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

export default perform App({ Part, pageProps }) {
return (
<Part {…pageProps} />

We’ve got 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 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 { person, error, isLoading } = useUser();

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

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

if (person) {
return (
<p>{person.e mail}</p>
<a href=”/api/auth/logout”>Logout</a>
return <a href=”/api/auth/login”>Login</a>;

The person object accommodates info associated to the person’s id. If the particular person visiting the web page is just not logged in (we don’t have a person object out there), we are going to show a hyperlink to the login web page. If the person is already authenticated, we are going to show person.title and person.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 may solely be seen for registered folks. To solely permit logged customers to see this web page, we are going to use withPageAuthRequired technique from the SDK.

import { withPageAuthRequired } from “@auth0/nextjs-auth0″;

export default () => {
return (
<a href=””>LoFi Music</a>
<a href=””>Jazz Music</a>
<a href=””>Piano Music</a>

export const getServerSideProps = withPageAuthRequired();

Take into accounts that our net software permits any particular person to enroll in an account, utilizing the Auth0 platform. The person may re-use an present 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 fee info 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 computerized method.


On this article, we noticed find out how 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 net 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 software to Vercel, you are able to do it right here.

Additional Studying And Assets

Auth0 Subsequent.js SDK GitHub repository, Auth0, GitHub
The Final Information To Subsequent.js Authentication With Auth0,” Sandrino Di Mattia, Auth0 Weblog
In our instance app, we used server-side rendering, with API routes and a serverless method. When you’re utilizing Subsequent.js for a static website, or a customized server to host your app, this text has some particulars about find out how to implement authentication.
New Common Login Expertise,” Auth0 Common Login, Auth0 Docs
Centralized Common Login vs. Embedded Login,” Auth0 Common Login, Auth0 Docs

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