To use Auth0 services, you need to have an application set up in the Auth0 Dashboard. The Auth0 application is where you will configure authentication in your project.

Configure an application

Use the interactive selector to create a new Auth0 application or select an existing application that represents the project you want to integrate with. Every application in Auth0 is assigned an alphanumeric, unique client ID that your application code will use to call Auth0 APIs through the SDK.

Any settings you configure using this quickstart will automatically update for your Application in the Dashboard, which is where you can manage your Applications in the future.

If you would rather explore a complete configuration, you can view a sample application instead.

Configure callback and logout URLs

Auth0 invokes the callback and logout URLs to redirect users back to your application. Auth0 invokes the callback URL after authenticating the user and the logout URL after removing the session cookie. If you do not set the callback and logout URLs, users will not be able to log in and out of the app, and your application will produce an error.

Add the corresponding URL to Callback URLs and Logout URLs, according to your app's platform. If you are using a custom domain, use the value of your custom domain instead of your Auth0 tenant’s domain.

iOS

BUNDLE_IDENTIFIER.auth0://{yourDomain}/ios/BUNDLE_IDENTIFIER/callback

Android

PACKAGE_NAME.auth0://{yourDomain}/android/PACKAGE_NAME/callback

In this section, you will learn how to install the React Native Auth0 module.

Yarn

yarn add react-native-auth0

npm

npm install react-native-auth0 --save

The Auth0 package runs custom native code that must be configured at build time. Use Expo Config Plugin to achieve this.

The react-native-auth0 plugin will be added in the Expo config

You must generate the native code for the above configuration to be set. To do this, run the following command:

expo prebuild

You will be prompted to provide the Android package and iOS bundle identifier if they are not already present in the Expo config.

? What would you like your Android package name to be? > com.auth0samples # or your desired package name

? What would you like your iOS bundle identifier to be? > com.auth0samples # or your desired bundle identifier

These values are used to set the callback and logout URLs.

The useAuth0 hook relies on a React Context to provide state management. This context is provided by the Auth0Provider component.

Import the useAuth0 hook and Auth0Provider component from the react-native-auth0 package:

import {useAuth0, Auth0Provider} from 'react-native-auth0';

For the SDK to function properly, you must wrap your application in the Auth0Provider component, and set the following properties:

• domain: The domain of your Auth0 tenant. Generally, you can find this in the Auth0 Dashboard under your Application's Settings in the Domain field. If you are using a custom domain, you should set this to the value of your custom domain instead.
• clientId: The ID of the Auth0 Application you set up earlier in this quickstart. You can find this in the Auth0 Dashboard under your Application's Settings in the Client ID field.

Authenticate the user by calling the authorize method provided by the useAuth0 hook. This redirects the user to the Auth0 Universal Login page for authentication, then back to your app.

For confirmation that the user was logged in successfully, check that the user property provided by the hook is not null.

To log the user out, redirect them to the Auth0 logout endpoint by calling clearSession. This will remove their session from the authorization server and log the user out of the application.

The useAuth0 hook exposes a user object that contains information about the authenticated user. You can use this to access user profile information about the authenticated user that has been decoded from the ID token.

If a user has not been authenticated, this property will be null.