LoginId

Describes all the hooks and methods available to customize the Universal Login login-id screen.

The login-id screen collects the user’s identifier as the first step of an identifier-first authentication flow. Depending on your tenant, this identifier can be an email, phone number, or username. It also supports passkey login, federated identity providers, and Google One Tap.

Import

Each screen has its own set of hooks and methods. The SDK supports partial import and root import for each screen.

• Using partial import allows you to include only the code you need for your specific use case.
• Using root import allows you to load all screens from a single bundle, which is useful when you want a unified build to handle all possible screens.

Import Example

// root import
import { useLoginId } from '@auth0/auth0-acul-react';

// partial import
import {
  useLoginId,
  // Context hooks
  useUser,
  useTenant,
  useBranding,
  useClient,
  useOrganization,
  usePrompt,
  useScreen,
  useTransaction,
  useUntrustedData,
  // Common hooks
  useCurrentScreen,
  useAuth0Themes,
  useErrors,
  // Utility hooks
  useLoginIdentifiers,
  useChangeLanguage,
  usePasskeyAutofill,
  // Methods
  login,
  federatedLogin,
  googleOneTap,
  passkeyLogin,
  pickCountryCode,
} from '@auth0/auth0-acul-react/login-id';

function LoginIdForm() {
  const { login } = useLoginId();
  return (
    <button onClick={() => login({ username: '[e-mail]' })}>
      Continue
    </button>
  );
}

Context Hooks

Screen-scoped hooks that provide read-only access to Auth0 context data on the login-id screen. Import them from @auth0/auth0-acul-react/login-id.

useBranding · () => BrandingMembers

This hook provides branding configurations, such as logo, colors, and theme settings displayed on the login-id screen.

Example

import { useBranding } from '@auth0/auth0-acul-react/login-id';
function CustomTheme() {
  const branding = useBranding();
}

useClient · () => ClientMembers

This hook provides client-related configurations, such as id, name, and logoUrl, for the login-id screen.

Example

import { useClient } from '@auth0/auth0-acul-react/login-id';
function AppInfo() {
  const client = useClient();
}

useOrganization · () => OrganizationMembers

This hook provides information about the user’s Organization if the login is Organization scoped. Returns null when no Organization context is present.

Example

import { useOrganization } from '@auth0/auth0-acul-react/login-id';
function OrgSelector() {
  const organization = useOrganization();
  if (!organization) {
    return <p>No organization context</p>;
  }
}

usePrompt · () => PromptMembers

This hook contains data about the current prompt in the authentication flow.

Example

import { usePrompt } from '@auth0/auth0-acul-react/login-id';
function FlowInfo() {
  const prompt = usePrompt();
}

useScreen · () => ScreenMembersOnLoginId

This hook contains details specific to the login-id screen, including its configuration and context.

Example

import { useScreen } from '@auth0/auth0-acul-react/login-id';
function ScreenDebug() {
  const screen = useScreen();
}

useTenant · () => TenantMembers

This hook contains data related to the tenant, such as id and associated metadata.

Example

import { useTenant } from '@auth0/auth0-acul-react/login-id';
function TenantInfo() {
  const tenant = useTenant();
}

useTransaction · () => TransactionMembersOnLoginId

This hook provides transaction-specific data for the login-id screen, such as active connections, available login methods, and current flow state.

Example

import { useTransaction } from '@auth0/auth0-acul-react/login-id';
function TransactionInfo() {
  const transaction = useTransaction();
}

useUntrustedData · () => UntrustedDataMembers

This hook handles untrusted data passed to the screen, such as a prefilled identifier from URL parameters.

Example

import { useUntrustedData } from '@auth0/auth0-acul-react/login-id';
function PrefilledForm() {
  const untrustedData = useUntrustedData();
}

useUser · () => UserMembers

This hook provides details of the active user, including username, email, and available authentication methods.

Example

import { useUser } from '@auth0/auth0-acul-react/login-id';
function UserProfile() {
  const user = useUser();
}

useLoginId · LoginIdMembers

This hook returns all methods and context available on the login-id screen.

Methods

googleOneTap · Promise<void>

This method authenticates the user using a Google One Tap credential, enabling one-click sign-in without redirecting to a separate login page.

Example

import { useLoginId } from '@auth0/auth0-acul-react/login-id';

function GoogleOneTapHandler({ credential }) {
  const { googleOneTap } = useLoginId();
  return googleOneTap({ one_tap_credential: credential });
}

Method Parameters

Show Parameters

one_tap_credential · string · required

The Google One Tap credential token returned by the Google Identity Services prompt.

federatedLogin · Promise<void>

This method redirects the user to the Social or Enterprise Identity Provider (IdP) for authentication.

Example

import { useLoginId } from '@auth0/auth0-acul-react/login-id';

function SocialButton() {
  const { federatedLogin } = useLoginId();
  return (
    <button onClick={() => federatedLogin({ connection: 'google-oauth2' })}>
      Sign in with Google
    </button>
  );
}

Method Parameters

Show Parameters

connection · string · required

The Social or Enterprise Identity Provider connection name.

login · Promise<void>

This method submits the user’s identifier to proceed to the next step in the authentication flow.

Example

import { useLoginId } from '@auth0/auth0-acul-react/login-id';

function LoginIdForm() {
  const { login } = useLoginId();
  return (
    <button onClick={() => login({ username: '[e-mail]' })}>
      Continue
    </button>
  );
}

Method Parameters

Show Parameters

options

LoginOptions.

username · string · required

The identifier (email, phone number, or username) to authenticate with.

captcha? · string

Captcha value required when bot detection is enabled on the tenant.

[`key`: `string`] · "string" | "number" | "boolean" | "undefined"

Additional custom fields prefixed with ulp- (for example, 'ulp-custom-field').

passkeyLogin · Promise<void>

This method initiates passwordless authentication using a passkey.

Example

import { useLoginId } from '@auth0/auth0-acul-react/login-id';

function PasskeyButton() {
  const { passkeyLogin } = useLoginId();
  return (
    <button onClick={() => passkeyLogin()}>
      Sign in with Passkey
    </button>
  );
}

Method Parameters

Show Parameters

options

CustomOptions.

[`key`: `string`] · "string" | "number" | "boolean" | "undefined"

Additional custom fields prefixed with ulp- (for example, 'ulp-custom-field').

pickCountryCode · Promise<void>

This method navigates to the country code picker for phone-based login flows.

Example

import { useLoginId } from '@auth0/auth0-acul-react/login-id';

function PhoneLogin() {
  const { pickCountryCode } = useLoginId();
  return (
    <button onClick={() => pickCountryCode()}>
      Select Country Code
    </button>
  );
}

Common/Utility Hooks

useAuth0Themes · Hooks

This hook gets the current theme options with flattened configuration from branding context.

useChangeLanguage · Hooks

This hook returns a function for changing the display language on the current ACUL screen.

useCurrentScreen · Hooks

This hook gets the current screen context and state.

useErrors · Hooks

This hook reads and manages server, client, and developer errors on the screen.

useLoginIdentifiers · Hooks

This hook returns a list of active identifier types (email, phone, username) in the current flow.

usePasskeyAutofill · Hooks

This hook enables passkey autofill on an input field for a seamless passwordless login experience.