> ## Documentation Index
> Fetch the complete documentation index at: https://docs-staging-quickstart-revamp.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Guide to implement ACUL for the ID First Login flow

# Build Identifier First Login with Password

<Card title="Before you start">
  You need:

  * An Auth0 development tenant configured with [Universal Login](/docs/authenticate/login/auth0-universal-login) and [custom domain](/docs/customize/custom-domains).
  * Enable [Identifier First Authentication](/docs/authenticate/login/auth0-universal-login/identifier-first) on your tenant to render the ACUL Login ID screen.
  * A development application or an [Auth0 SDK sample application](/docs/quickstart/spa/react/interactive) on `localhost` for Auth0 authentication.
  * A [database connection](/docs/authenticate/database-connections) to authenticate users.
  * An [Auth0 ACUL sample application](https://github.com/auth0-samples/auth0-acul-samples) to render the ACUL screens.
</Card>

By the end of this guide, you'll have an identity-first flow with customized Login ID and Login Password screens. To learn more, read the [Getting Started guide](/docs/customize/login-pages/advanced-customizations/getting-started) and visit the [SDK reference guide](/docs/customize/login-pages/advanced-customizations/getting-started/sdk-quickstart).

## Setup

In your <Tooltip tip="Auth0 Dashboard: Auth0's main product to configure your services." cta="View Glossary" href="/docs/glossary?term=Auth0+Dashboard">Auth0 Dashboard</Tooltip>, set up [Universal Login](/docs/authenticate/login/auth0-universal-login/universal-login-vs-classic-login/universal-experience), [Identifier First Authentication](/docs/authenticate/login/auth0-universal-login/identifier-first), and a [Database Connection](/docs/get-started/applications/set-up-database-connections) that uses passwords.

Run a single-page application to build custom login screens. To understand the context for Advanced Customizations interfaces, clone our boilerplate app: `git clone https://github.com/auth0/auth0-acul-react-boilerplate`

Install the [ACUL SDK](/docs/customize/login-pages/advanced-customizations/getting-started/sdk-quickstart). After cloning the react boilerplate, change the directory to the `auth0-acul-react-boilerplate` folder and install the SDK.

```bash lines
# Clone the ACUL sample application into the root folder of your project

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

# Change directory to install the ACUL sample application 

cd auth0-acul-samples && npm i
```

This example uses [Shadcn components](https://ui.shadcn.com/docs/installation/vite#edit-tsconfigjson-file). Run the `shadcn` init command to set up your project. After answering a few questions to configure `components.json`, begin adding components to your project. Your completed Build Identifier First Login with Password flow will use `button`, l`abel`, `input`, `text`, `link`, `CardHeader`, `CardTitle`, `CardDescription`, and `CardContent` components.

```bash lines
npx shadcn@latest init

npx shadcn@latest add button input label text link card
```

## Step 1. Build the login-id screen

<Frame>
  <img src="https://mintcdn.com/docs-staging-quickstart-revamp/fNPG21NgQLCA0axA/images/cdy7uua7fh8z/1nvMFmxC5ODCW2q7cByHv8/657d87ba1c2eb11316e6b0ef93737c99/LoginIDACUL.png?fit=max&auto=format&n=fNPG21NgQLCA0axA&q=85&s=6b0084ca7f1a5701d671e6eb2845384a" alt="" width="409" height="562" data-path="images/cdy7uua7fh8z/1nvMFmxC5ODCW2q7cByHv8/657d87ba1c2eb11316e6b0ef93737c99/LoginIDACUL.png" />
</Frame>

Below is a full sample of the Screen. This example uses [Shadcn components](https://ui.shadcn.com/docs/installation/vite#edit-tsconfigjson-file).

<Accordion title="Login ID Screen sample for Login ID">
  ```jsx lines expandable
  import { ChangeEvent } from "react";
  import { LoginId as ScreenProvider } from "@auth0/auth0-acul-js";

  // UI Components
  import { Label } from "@/components/ui/label";
  import { Input } from "@/components/ui/input";
  import { Button } from "@/components/ui/button";
  import { Text } from "@/components/ui/text";
  import { Link } from "@/components/ui/link";
  import {
    CardHeader,
    CardTitle,
    CardDescription,
    CardContent,
  } from "@/components/ui/card";

  export default function LoginId() {
    // Initialize the SDK for this screen
    const screenProvider = new ScreenProvider();

    // Handle the submit action
    const formSubmitHandler = (event: ChangeEvent<HTMLFormElement>) => {
      event.preventDefault();

      // grab the value from the form
      const identifierInput = event.target.querySelector(
        "input#identifier"
      ) as HTMLInputElement;

      // Call the SDK
      screenProvider.login({ username: identifierInput?.value });
    };

    // Render the form
    return (
      <form noValidate onSubmit={formSubmitHandler}>
        <CardHeader>
          <CardTitle className="mb-2 text-3xl font-medium text-center">
            {screenProvider.screen.texts?.title ?? "Welcome"}
          </CardTitle>
          <CardDescription className="mb-8 text-center">
            {screenProvider.screen.texts?.description ?? "Login to continue"}
          </CardDescription>
        </CardHeader>
        <CardContent>
          <div className="mb-2 space-y-2">
            <Label htmlFor="identifier">
              {screenProvider.screen.texts?.emailPlaceholder ??
                "Enter your email"}
            </Label>
            <Input
              type="text"
              id="identifier"
              name="identifier"
              defaultValue={
                screenProvider.screen.data?.username ??
                screenProvider.untrustedData.submittedFormData?.username
              }
            />
          </div>
          <Button type="submit" className="w-full">
            {screenProvider.screen.texts?.buttonText ?? "Continue"}
          </Button>
          <Text className="mb-2">
            {screenProvider.screen.texts?.footerText ??
              "Don't have an account yet?"}
            <Link className="ml-1" href={screenProvider.screen.signupLink ?? "#"}>
              {screenProvider.screen.texts?.footerLinkText ??
                "Create your account"}
            </Link>
          </Text>
          <Text>
            Need Help?
            <Link
              className="ml-1"
              href={screenProvider.screen.resetPasswordLink ?? "#"}
            >
              {screenProvider.screen.texts?.forgottenPasswordText ??
                "Forgot your Password?"}
            </Link>
          </Text>
        </CardContent>
      </form>
    );
  }
  ```
</Accordion>

### Import and initialize the SDK

In the `auth0-acul-react-boilerplate/src` folder, create a folder called `screens` and a file called `Login.tsx`. Import the SDK and in the React component initialize the SDK for the screen.

```jsx lines
import { LoginId as ScreenProvider } from "@auth0/auth0-acul-js";

export default function LoginId() {
  // Initialize the SDK for this screen
  const screenProvider = new ScreenProvider();
  ...
}
```

### Use the SDK to access properties and methods on the screen

Using the SDK you can access the properties and methods of the screen. The [Auth0 ACUL JS SDK](/docs/customize/login-pages/advanced-customizations/getting-started/sdk-quickstart) provides properties and methods to access the data.

For more information about context data, read Universal Login Context Data.

```jsx lines
<CardContent>
    <div className="mb-2 space-y-2">
      <Label htmlFor="identifier">
        {screenProvider.screen.texts?.emailPlaceholder ??
          "Enter your email"}
      </Label>
      <Input
        type="text"
        id="identifier"
        name="identifier"
        defaultValue={
          screenProvider.screen.data?.username ??
          screenProvider.untrustedData.submittedFormData?.username
        }
      />
    </div>
    <Button type="submit" className="w-full">
      {screenProvider.screen.texts?.buttonText ?? "Continue"}
    </Button>
    ...
  </CardContent>
</form>
```

### Call the submit action

Using the SDK, submit the data captured in the screen to the server. The server process this data and will route the user to the next step in the flow. If there are errors, this screen is reloaded, allowing you to display them to the user. Errors are accessed from the SDK.

```javascript lines
const formSubmitHandler = (event: ChangeEvent<HTMLFormElement>) => {
    event.preventDefault();

    // grab the value from the form
    const identifierInput = event.target.querySelector(
      "input#identifier"
    ) as HTMLInputElement;

    // Call the SDK
    screenProvider.loginid({ username: identifierInput?.value });
  };
```

## Step 2. Build the login-password screen

<Frame>
  <img src="https://mintcdn.com/docs-staging-quickstart-revamp/cn1eMmAiJHX3hF4T/images/cdy7uua7fh8z/Em8VqaD4fPUx6FRevD8fh/a9133a19565d5d9ddc1454535a0a7a11/loginpassword.png?fit=max&auto=format&n=cn1eMmAiJHX3hF4T&q=85&s=cdb26cde4a24d98acf85fd2e2114e633" alt="" width="480" height="852" data-path="images/cdy7uua7fh8z/Em8VqaD4fPUx6FRevD8fh/a9133a19565d5d9ddc1454535a0a7a11/loginpassword.png" />
</Frame>

Below is a full sample of the screen.

<Accordion title="Login Password">
  ```jsx lines expandable
  import { ChangeEvent } from "react";
  import { LoginPassword as ScreenProvider } from "@auth0/auth0-acul-js";

  // UI Components
  import { Label } from "@/components/ui/label";
  import { Input } from "@/components/ui/input";
  import { Button } from "@/components/ui/button";
  import { Text } from "@/components/ui/text";
  import { Link } from "@/components/ui/link";
  import {
    CardHeader,
    CardTitle,
    CardDescription,
    CardContent,
  } from "@/components/ui/card";

  export default function LoginPassword() {
    // Initialize the SDK for this screen
    const screenProvider = new ScreenProvider();

    // Handle the submit action
    const formSubmitHandler = (event: ChangeEvent<HTMLFormElement>) => {
      event.preventDefault();

      // grab the values from the form
      const identifierInput = event.target.querySelector(
        "input#identifier"
      ) as HTMLInputElement;
      const passwordInput = event.target.querySelector(
        "input#password"
      ) as HTMLInputElement;

      // Call the SDK
      screenProvider.login({
        username: identifierInput?.value,
        password: passwordInput?.value,
      });
    };

    // Render the form
    return (
      <form noValidate onSubmit={formSubmitHandler}>
        <CardHeader>
          <CardTitle className="mb-2 text-3xl font-medium text-center">
            {screenProvider.screen.texts?.title ?? "Enter Your Password"}
          </CardTitle>
          <CardDescription className="mb-8 text-center">
            {screenProvider.screen.texts?.description ??
              "Enter your password to continue"}
          </CardDescription>
        </CardHeader>
        <CardContent>
          <Text className="mb-4 text-large">
            <span className="inline-block">
              Log in as
              <span className="inline-block ml-1 font-bold">
                {screenProvider.screen.data?.username}.
              </span>
            </span>
            <Link
              href={screenProvider.screen.editIdentifierLink ?? "#"}
              className="ml-2"
            >
              {screenProvider.screen.texts?.editEmailText ?? "Edit Email"}
            </Link>
          </Text>
          <Input
            type="hidden"
            name="identifier"
            id="identifier"
            value={screenProvider.screen.data?.username}
          />
          <div className="mb-2 space-y-2">
            <Label htmlFor="password">
              {screenProvider.screen.texts?.passwordPlaceholder ?? "Password"}
            </Label>
            <Input type="password" id="password" name="password" />
          </div>
          <Button type="submit" className="w-full">
            {screenProvider.screen.texts?.buttonText ?? "Continue"}
          </Button>
          <Text>
            Need Help?
            <Link
              href={screenProvider.screen.resetPasswordLink ?? "#"}
              className="ml-1"
            >
              {screenProvider.screen.texts?.forgottenPasswordText ??
                "Forgot your Password?"}
            </Link>
          </Text>
        </CardContent>
      </form>
    );
  }
  ```
</Accordion>

### Import and initialize the SDK

In the `auth0-acul-react-boilerplate/src` folder, create a folder called `screens` and a file called `Login.tsx`. Import the SDK and in the React component initialize the SDK for the screen.

```js lines
import { LoginPassword as ScreenProvider } from "@auth0/auth0-acul-js";

export default function LoginPassword() {
  // Initialize the SDK
  const [SDK] = useState(() => new ScreenProvider());\
  ...
  }
```

### Use the SDK to access properties and methods on the screen

Using the SDK you can access the properties and methods of the screen. The [Auth0 ACUL JS SDK](/docs/customize/login-pages/advanced-customizations/getting-started/sdk-quickstart) provides properties and methods to access the data.

```jsx lines expandable
<CardContent>
        <Text className="mb-4 text-large">
          <span className="inline-block">
            Log in as
            <span className="inline-block ml-1 font-bold">
              {screenProvider.screen.data?.username}.
            </span>
          </span>
          <Link
            href={screenProvider.screen.editIdentifierLink ?? "#"}
            className="ml-2"
          >
            {screenProvider.screen.texts?.editEmailText ?? "Edit Email"}
          </Link>
        </Text>
        <Input
          type="hidden"
          name="identifier"
          id="identifier"
          value={screenProvider.screen.data?.username}
        />
        <div className="mb-2 space-y-2">
          <Label htmlFor="password">
            {screenProvider.screen.texts?.passwordPlaceholder ?? "Password"}
          </Label>
          <Input type="password" id="password" name="password" />
        </div>
        <Button type="submit" className="w-full">
          {screenProvider.screen.texts?.buttonText ?? "Continue"}
        </Button>
...
      </CardContent>
    </form>
```

### Call the submit action

Using the SDK, submit the data captured in the screen to the server. The server process this data and will route the user to the next step in the flow. If there are errors, this screen is reloaded, allowing you to display them to the user. Errors are accessed from the SDK.

```javascript lines
const formSubmitHandler = (event: ChangeEvent<HTMLFormElement>) => {
    event.preventDefault();

    // grab the values from the form
    const identifierInput = event.target.querySelector(
      "input#identifier"
    ) as HTMLInputElement;
    const passwordInput = event.target.querySelector(
      "input#password"
    ) as HTMLInputElement;

    // Call the SDK
    screenProvider.login({
      username: identifierInput?.value,
      password: passwordInput?.value,
    });
  };
```

## Step 3. Configure ACUL to use local assets

Use Auth0 CLI, Terraform, or the <Tooltip tip="Management API: A product to allow customers to perform administrative tasks." cta="View Glossary" href="/docs/glossary?term=Management+API">Management API</Tooltip> to enable ACUL. For details about what can be configured, read [Configure ACUL Screens](/docs/customize/login-pages/advanced-customizations/getting-started/configure-acul-screens).

<Tabs>
  <Tab title="Auth0 CLI (Recommended)">
    In the root directory of your project, create a `settings` folder and include in it a `{SCREENNAME}.json` file.

    ```json lines expandable
    //settings.json
    {
      "rendering_mode": "advanced",
      "context_configuration": [
        "screen.texts"
      ],
      "head_tags": [
        {
          "attributes": {
            "async": true,
            "defer": true,
            "integrity": [
              "ASSET_SHA"
            ],
            "src": "http://127.0.0.1:8080/index.js"
          },
          "tag": "script"
        },
        {
          "attributes": {
            "href": "http://127.0.0.1:8080/index.css",
            "rel": "stylesheet"
          },
          "tag": "link"
        }
      ]
    }
    ```

     Enable ACUL with Auth0 CLI:

    ```bash wrap lines
    auth0 ul customize --rendering-mode advanced --prompt {SCREENNAME} --screen {SCREENNAME} --settings-file ./settings/{SCREENNAME}.json
    ```
  </Tab>

  <Tab title="Auth0 Terraform">
    In the root directory of your project, create a `login-id.json` file:

    ```json lines expandable
    //login-id.json
    {
      "rendering_mode": "advanced",
      "context_configuration": [
        "screen.texts"
      ],
      "head_tags": [
        {
          "attributes": {
            "async": true,
            "defer": true,
            "integrity": [
              "ASSET_SHA"
            ],
            "src": "http://127.0.0.1:8080/index.js"
          },
          "tag": "script"
        },
        {
          "attributes": {
            "href": "http://127.0.0.1:8080/index.css",
            "rel": "stylesheet"
          },
          "tag": "link"
        }
      ]
    }
    ```

     Enable ACUL with Auth0 Terraform

    ```yaml lines
    prompts:
      identifier_first: true
      universal_login_experience: classic
            mfa-login-options:
              pageTitle: 'Log in to ${clientName}'
              authenticatorNamesSMS: 'SMS'
      screenRenderers:
        - login-id:
            login-id: ./prompts/screenRenderSettings/login-id.json
    ```
  </Tab>

  <Tab title="Auth0 Management API">
    You can use Auth0 Management API to enable ACUL

    ```bash lines expandable
    curl --location --request PATCH 'https://{YOUR-CUSTOM-DOMAIN}/api/v2/prompts/{YOUR-PROMPT}/screen/{YOUR-SCREEN}/rendering' \
    --header 'Content-Type: application/json' \
    --header 'Authorization: Bearer <API TOKEN>' \
    --data '{
        "rendering_mode": "advanced",
            "context_configuration": [
            "branding.settings",
            "organization.branding",
            "screen.texts",
            "tenant.name",
            "tenant.friendly_name",
            "tenant.enabled_locales",
            "untrusted_data.submitted_form_data",
            "untrusted_data.authorization_params.ui_locales",
            "untrusted_data.authorization_params.login_hint",
            "untrusted_data.authorization_params.screen_hint"
        ],
        "head_tags": [
          {
            "tag": "script",
            "attributes": {
              "src": "http://127.0.0.1:8080/index.js",
              "defer": true
            }
          },
          {
            "tag": "link",
            "attributes": {
              "rel": "stylesheet",
              "href": "http://127.0.0.1:8080/index.css"
            }
          },
          {
            "tag": "meta",
            "attributes": {
              "name": "viewport",
              "content": "width=device-width, initial-scale=1"
            }
          }
        ]
    }'
    ```
  </Tab>
</Tabs>

### Test your configuration on a local server

ACUL requires assets to be hosted on a public URL. Run a local server and test your assets before deploying them.

```bash lines
# Creates the local assets 

npm run build 
cd dist 

# Serves the assets from localhost

npx serve -p 8080 --cors
```

## Step 4: Deploy the assets and update your tenant configuration

Advanced Customization for <Tooltip tip="Universal Login: Your application redirects to Universal Login, hosted on Auth0's Authorization Server, to verify a user's identity." cta="View Glossary" href="/docs/glossary?term=Universal+Login">Universal Login</Tooltip> works with all modern Javascript bundlers. like Vite and Webpack. For more information, read [Deploy and Host Advanced Customizations](/docs/customize/login-pages/advanced-customizations/getting-started/deploy-and-host-advanced-customizations).

For more information about deploying ACUL to your tenant, read [Configure ACUL Screens.](/docs/customize/login-pages/advanced-customizations/getting-started/configure-acul-screens)

## Related content

<table class="table">
  <thead>
    <tr>
      <th><strong>Read...</strong></th>
      <th><strong>To learn...</strong>                                </th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td><a href="/docs/customize/login-pages/advanced-customizations">Advanced Customizations for Universal Login</a></td>
      <td>How Advanced Customizations work.</td>
    </tr>

    <tr>
      <td><a href="/docs/customize/login-pages/advanced-customizations/getting-started">Getting Started with Advanced Customizations</a></td>
      <td>Getting Started basics for Advanced Customizations</td>
    </tr>

    <tr>
      <td><a href="/docs/customize/login-pages/advanced-customizations/reference">Advanced Customizations for Universal Login: Screens</a></td>
      <td>A list of all screens available for Advanced Customizations.</td>
    </tr>
  </tbody>
</table>