Auth0 allows you to quickly add authentication and access user profile information in your application. This guide demonstrates how to integrate Auth0 with a Flutter application using the Auth0 Flutter SDK.
The Flutter SDK currently only supports Flutter applications running on Android, iOS, or Web platforms.
This quickstart assumes you already have a Flutter application up and running. If not, check out the Flutter “getting started” guides to get started with a simple app.You should also be familiar with the Flutter command line tool.
1

Configure Auth0

When you signed up for Auth0, a new application was created for you, or you could have created a new one. You will need some details about that application to communicate with Auth0. You can get these details from the Application Settings section in the Auth0 dashboard.
When using the Default App with a Native or Single Page Application, ensure to update the Token Endpoint Authentication Method to None and set the Application Type to either SPA or Native.
You need the following information:
  • Domain
  • Client ID
If you download the sample from the top of this page, these details are filled out for you.

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Configure Callback URLs

A callback URL is a URL in your application where Auth0 redirects the user after they have authenticated. The callback URL for your app must be added to the Allowed Callback URLs field in your Application Settings. If this field is not set, users will be unable to log in to the application and will get an error.
If you are following along with the sample project you downloaded from the top of this page, you should set the Allowed Callback URL to http://localhost:3000.

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Configure Logout URLs

A logout URL is a URL in your application that Auth0 can return to after the user has been logged out of the authorization server. This is specified in the returnTo query parameter. The logout URL for your app must be added to the Allowed Logout URLs field in your Application Settings. If this field is not set, users will be unable to log out from the application and will get an error.
If you are following along with the sample project you downloaded from the top of this page, the logout URL you need to add to the Allowed Logout URLs field is http://localhost:3000.

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Configure Allowed Web Origins

You need to add the URL for your app to the Allowed Web Origins field in your Application Settings. If you don’t register your application URL here, the application will be unable to silently refresh the authentication tokens and your users will be logged out the next time they visit the application, or refresh the page.
If you are following along with the sample project you downloaded from the top of this page, you should set the Allowed Web Origins to http://localhost:3000.
2

Install the Auth0 Flutter SDK

Add the Auth0 Flutter SDK into the project:
flutter pub add auth0_flutter
Add the following script tag to your index.html page:
<script src="https://cdn.auth0.com/js/auth0-spa-js/2.0/auth0-spa-js.production.js" defer></script>
3

Add login to your application

Universal Login is the easiest way to set up authentication in your application. We recommend using it for the best experience, best security, and the fullest array of features.Integrate Auth0 Universal Login in your Flutter Web app by using the Auth0Web class. Redirect your users to the Auth0 Universal Login page using loginWithRedirect().
You will normally need to specify the redirectUrl parameter to loginWithRedirect. Omitting this will cause Auth0 to use the default login route, which is not configured by default.
When a user logs in, they are redirected back to your application. You are then able to access the ID and access tokens for this user by calling onLoad during startup and handling the credentials that are given to you:
auth0.onLoad().then((final credentials) => setState(() {
// Handle or store credentials here

_credentials = credentials;

}));
Checkpoint
Add a button to your app that calls loginWithRedirect() and logs the user into your app. Verify that you are redirected to Auth0 for authentication and then back to your application.Verify that you can access credentials as a result of calling onLoad and that you’re able to access the ID and access tokens.
4

Add logout to your application

To log users out, redirect them to the Auth0 logout endpoint to clear their login session by calling the Auth0 Flutter SDK logout(). Read more about logging out of Auth0.
You will normally want to specify returnToUrl when calling logout, otherwise Auth0 will default to the first URL in the Allowed Logout URLs list.
Checkpoint
Add a button to your app that calls logout() and logs the user out of your application. When you select it, verify that your Flutter app redirects you to the logout endpoint and back again. You should not be logged in to your application.
5

Show user profile information

The user profile automatically retrieves user profile properties for you when the page loads, and can be accessed and stored by calling onLoad during application startup. The returned object from onLoad contains a user property with all the user profile properties. This is internally populated by decoding the ID token.
Checkpoint
Log in and inspect the user property on the result. Verify the current user’s profile information, such as email or name.

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Next Steps

Excellent work! If you made it this far, you should now have login, logout, and user profile information running in your application.

This concludes our quickstart tutorial, but there is so much more to explore. To learn more about what you can do with Auth0, check out:
  • Auth0 Dashboard - Learn how to configure and manage your Auth0 tenant and applications
  • auth0-flutter SDK - Explore the SDK used in this tutorial more fully
  • Auth0 Marketplace - Discover integrations you can enable to extend Auth0’s functionality