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 URLs

A callback URL is the application URL that Auth0 will direct your users to once they have authenticated. If you do not set this value, Auth0 will not return users to your application after they log in.

Configure Logout URLs

A logout URL is the application URL Auth0 will redirect your users to once they log out. If you do not set this value, users will not be able to log out from your application and will receive an error.

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

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

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.