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Build a Login ID screen using ACUL
Learn how to build a Login screen using ACUL
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files/settings
files/auth_config
files/index
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Build a Login ID screen using ACUL

Configure Auth0

To use Auth0 services, you’ll need to have an application set up in the Auth0 Dashboard. The Auth0 application is where you will configure how you want authentication to work for the project you are developing.

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 a URL in your application that you would like Auth0 to redirect users to after they have authenticated. If not set, users will not be returned to your application after they log in.

If you are following along with our sample project, set this to http://localhost:3000.

Configure Logout URLs

A logout URL is a URL in your application that you would like Auth0 to redirect users to after they have logged out. If not set, users will not be able to log out from your application and will receive an error.

If you are following along with our sample project, set this to http://localhost:3000.

Configure Allowed Web Origins

An Allowed Web Origin is a URL that you want to be allowed to access to your authentication flow. This must contain the URL of your project. If not properly set, your project will be unable to silently refresh authentication tokens, so your users will be logged out the next time they visit your application or refresh a page.

If you are following along with our sample project, set this to http://localhost:3000.

Configure ACUL for Login ID screen {{{ data-action="code" data-code="settings.json" }}}

Use Auth0 CLI to enable ACLU Login ID screen in your tenant.

In the root directory of your project, save the settings.json file.

Enable ACUL by running the following command in your terminal:

auth0 ul customize --rendering-mode advanced --prompt login-id --screen login-id --settings-file ./settings.json

Development Setup: This example is using localhost (127.0.0.1:8080) for development.

For production, you will need to update these URLs to point to your CDN or static hosting service.

Initiate Universal Login {{{ data-action="code" data-code="auth_config.json" }}}

Use one of the sample apps provided by Auth0 to initiate Universal Login

In the root folder of your project, clone the Auth0 sample application using the following command: 

git clone https://github.com/auth0-samples/auth0-react-samples

Change directory to the auth0-react-samples/Sample-01 folder and install the sample application using the following command:

cd auth0-react-samples/Sample-01

npm install

Change directory to the auth0-react-samples/Sample-01/src folder and add the auth_config.json file. Edit the file to add your tenant's Custom Domain.

Run the application

npm run dev

ACUL Login ID screen Step 2 - Checkpoint

  1. Open your application (default: http://localhost:3000)

  2. Select the Log In button on the sample app

  3. You should be redirected to your Auth0 domain

After selecting Log In, you should see a blank page.

This is expected! It means Auth0 is trying to load your custom UI assets, which we have not created yet.

If you see the default Auth0 page instead of a blank page:

  1. Check if your custom domain is properly configured.

  2. Ensure your application is using the custom domain.

Build a custom interface for login-id screen {{{ data-action="code" data-code="index.tsx" }}}

Run a single-page application to build custom login screens.

Configure the Boilerplate application

1. In the root folder of your project, open a new terminal and clone the Auth0 boilerplate application using the following command:

git clone https://github.com/auth0-samples/auth0-react-samples

2. Change directory to the auth0-acul-react-boilerplate folder and install the application and the ACUL JS SDK.

// open the directory where you git clone the boilerplate

cd auth0-acul-react-boilerplate && npm i


// Install the ACUL JS SDK


npm install @auth0/auth0-acul-js

3. Build the application

npm run build

4. Serve the assets

npx http-server dist -p 8080

The assets are served from localhost during development.

For production, you'll need to serve these assets from a CDN or static hosting service.

ACUL Login ID screen quickstart step 4 checkpoint

After selecting Log In, you are greeted with a “Hello World” page.

Make sure to have installed the ACUL JS SDK after installing the boilerplate application.

Build the ACUL Login ID screen

Change directory to the auth0-acul-react-boilerplate/src/screens/loginId/ and edit the index.tsx file.

Rebuild the application with the following command:

npm run build

ACUL Login ID screen quickstart step 4 rebuild the app checkpoint

Select Log In.

You should now see a customized login page as shown below: