Customize Signup and Login Prompts

Before you start

Make sure your tenant has a Custom Domain configured.
Confirm you are using Universal Login for all signup and login prompts, and ensure the Customize Login Page toggle has been disabled for Login Prompts.
Check that you have a Custom Page Template configured.

Customize Signup and Login Prompts is a feature that allows customers with and Custom Page Template enabled to add custom fields and content to their app’s signup and login prompts.

Use Cases

Customize Signup and Login Prompts supports two use cases: custom content and data capture. Custom content is static content like text, links, or images placed directly on the signup and login prompts. Data capture uses form elements dynamically added to the signup and login prompts, which is useful for collecting and validating user consent or user-produced data like surname. Data capture is available for database connections authenticated by password . When using a connection, data capture is available when authenticating by email or SMS one-time password. Passkeys and magic links are not yet supported.

Only use Signup and Login Prompt Customizations to convey or collect sensitive or regulated data as permitted under your agreement with Okta.

Terminology

A prompt is a specific step in a given authentication flow. Each prompt has at least one screen and, depending on tenant configuration, each supported screen has either four or six entry points, which arelocations in the screen where custom code (partials) can be inserted. The following prompts can be customized:

signup
signup-id
signup-password
login
login-id
login-password
login-passwordless
- login-passwordless-sms-otp
- login-passwordless-email-code

Partials support HTML, CSS, Javascript, and Liquid syntax to power conditional logic and dynamic variables. In addition, any Liquid variable that is available to the Page Template is also supported. These entry points available when a database or passwordless connection is enabled:

form-content-start
form-content-end
form-footer-start
form-footer-end

The following entry points are available when at least one social or enterprise connection is enabled:

secondary-actions-start
secondary-actions-end

Screenshots of each Custom Prompt option and their partials

Use the Management API to Manage Partials

Partials can be a maximum of 10,000 characters and are managed by the Auth0 Management API at /v2/prompts/{prompts_name}/partials. Every prompt must specify the Screen when adding, updating, or deleting a partial. Below is an example call to view all existing partials for a prompt, noting that ulp-container prefix is not required when referencing entry points in API calls.

GET /api/v2/prompts/signup-id/partials
# response
# success code: 200
# not found code: 404
body: {
  "signup-id": {
    "form-content-start": "<div>HTML or Liquid</div>...",
    "form-content-end": "<div>HTML or Liquid</div>..."
  }
}

Partials can also be managed using Auth0 CLI’s Customize Interface by running auth0 ul customize in your terminal.

An image showing the command-line interface for Partials.

Style and Validate Form Inputs

Customize Signup and Login Prompts offers pre-built styles and support for client-side validations for certain HTML form elements. The following elements are supported:

<input type="text">
<input type="number">
<input type="checkbox">
<input type="password">
<input type="email">
<input type="tel">
<input type="url">
<select>
<textarea>

To use pre-built input styles, wrap your form element of choice in a <div> with the ulp-field class. Similarly, add the ulp-error class to the same <div> to use pre-built error styles. If the ulp-error-info element is present, a styled error message will also be displayed.

Client-Side Validation

The feature’s client-side validation framework allows customers to validate user input using HTML attributes to execute one or more custom validation functions. Validation functions can be included directly in the Partial or included in the <head> of the page template. To add client-side validation to a form element:

Reference the validation function using the data-ulp-validation-function attribute on the <div class="ulp-error-info"> element.
Declare which DOM events the validation function should be run on using the data-ulp-validation-event-listeners attribute on the <div class="ulp-error-info"> element, noting that validations run automatically on submission.
For WCAG compliance, inputs must be programmatically linked to their error messages - for example, by using aria-describedby="error-id" and aria-invalid="true" - to ensure screen readers announce validation errors.

Input Field Elements: Pre-built styling for input fields

<div class="ulp-field">
  <label for="first-name">First Name</label>
  <input type="text" name="ulp-first-name" id="first-name">
  <div class="ulp-error-info">
    First Name is Required
  </div>
</div>

Select Elements: Pre-built styling for select fields

<div class="ulp-field">
  <label for="preferred-language">Preferred Language</label>
  <select name="ulp-preferred-language" id="preferred-language">
    <option></option>
    <option value="english">English</option>
    <option value="french">French</option>
    <option value="spanish">Spanish</option>
  </select>
  <div class="ulp-error-info">
    Please Select a Language.
  </div>
</div>

Text Elements: Pre-built styling for text fields

<div class="ulp-field">
  <label for="comments">Comments</label>
  <textarea type="text" name="ulp-comments" id="comments"></textarea>
  <div class="ulp-error-info">
    Please provide an answer.
  </div>
</div>

Checkbox Elements: Pre-built styling for checkbox fields

<div class="ulp-field">
  <input type="checkbox" name="ulp-terms-of-service" id="terms-of-service">
  <label for="terms-of-service">
    I agree to the <a href="#">Terms of Service</a>
  </label>
  <div class="ulp-error-info">
    Please agree to the Terms of Service.
  </div>
</div>

Phone Number Validation: Client-Side Phone Number Validation

// Validation Function
<script>
  function validatePhoneFunction(element, formSubmitted) {
    if (!formSubmitted) {
      return true;
    }
    return element.value.replace(/\D/g, '').length === 10;
  }
</script>

// Custom Input Field including the validation error HTML
<div class="ulp-field">
  <label for="ulp-field-phone">Phone Number</label>
  <input type="text" name="ulp-field-phone" id="ulp-field-phone">
  <div
    class="ulp-error-info"
    data-ulp-validation-function="validatePhoneFunction"
    data-ulp-validation-event-listeners="blur,change,input,focus">
    Invalid phone number
  </div>
</div>

Screen Reader Validation: Validation for accessible error messages

<script>
  function requiredTextFunction(element, formSubmitted) {
    if (!formSubmitted) return true;
    return element.value.trim().length > 0;
  }
</script>

<div class="ulp-field">
  <label for="ulp-phone">Phone Number</label>
  <input
    type="text"
    id="ulp-phone"
    name="ulp-field-phone"
    aria-describedby="error-phone-required"
    aria-invalid="true"
    required
  >
  <div
    id="error-phone-required"
    class="ulp-error-info"
    role="alert"
    data-ulp-validation-function="requiredTextFunction"
    data-ulp-validation-event-listeners="change"
  >
    Phone number is required
  </div>
</div>

Be cautious when using third-party JavaScript on your signup page. Sensitive security-related information often flows through the signup page, leaving it vulnerable to cross-site scripting.Whenever possible, Auth0 recommends validating user-provided data before submitting.

Localize Content

Partial content can be localized by defining new custom text variables using the Custom Text API. Up to thirty custom text variables can be defined per screen/language combination.

Create or Update a Custom Text Variable

The Custom Text API is available here and each variable follows a var-<name> naming convention. Calls to the API must specify the screen when adding, updating, or deleting a custom text variable. Markdown links are supported and are converted to HTML <a> elements before being displayed to users. Below is an example call to add a variable for the text of a terms of service checkbox label in English and Spanish. See the to learn more.

# PUT /api/v2/prompts/signup-id/custom-text/en
{
  "signup": {
    "var-tos": "I agree with the [Terms of Service](https://en.example.com/tos)"
  }
}

# PUT /api/v2/prompts/signup-id/custom-text/es
{
  "signup": {
    "var-tos": "Estoy de acuerdo con los [Términos de Servicio](https://es.example.com/tos)"
  }
}

Use a Custom Text Variable in a Partial

Custom text variables are referenced in partials using the prompts.screen.text object; the reference for the var-tos example in the previous section is prompt.screen.texts.varTos. See below for an example of how to use a previously created variable in a partial on the Signup ID Prompt, noting that the Management API’s var-tos variable is referenced as varTos in the partial.

# PUT api/v2/prompts/signup/partials
{
  "signup": {
    "form-content-end": "<div class='ulp-field'><input type='checkbox' name='ulp-terms-of-service' id='terms-of-service'><label for='terms-of-service'>{{ prompt.screen.texts.varTos }}</label></div>"
  }
}

Validate and Save Captured Data

Data captured by custom form elements is available in Actions, and Auth0 recommends that the collected data be validated.

When using custom form elements, you must include the ulp- prefix with any input names to ensure the data can be used with Actions.

Each Action receives the captured data as an object on the event.request.body. Customers can return a validation error by using the api.validation.error function. When using a database connection:

Data from the Signup Prompts is accessible on the Pre User Registration trigger, and if a validation error is returned, the user is prevented from registering.
Data from Login Prompts is accessible on the Post Login trigger, and if a validation error is returned, the validation error is forwarded to the customer’s application error page.

When using a Passwordless connection:

Data from both the Signup and Login Prompts is accessible on the Post Login trigger, and if a validation error is returned, the validation error is forwarded to the customer’s application error page.

Sanitize any data that you collect on the form before saving or rendering it.

Ensure any data being saved has passed through Liquid’s {{escape}} helper function
If you render data in an Email Template, remove Liquid syntax
If you render data on a webpage, escape HTML entities
If you save data to a database, use parameterized queries
If you pass data into query string, encode with eg: {{encodeURI}} or {{encodeURIParam}}

For more information regarding risk mitigation and best practices for securely storing data see this cheatsheet.

Save to User Metadata

From the Action, captured data can be sent to an external API for validation and storage or saved in user_metadata on the user via api.user.setUserMetadata.

// Given this code in the signup form
// <div class="ulp-field">
//   <label for="full-name">Full Name</label>
//   <input type="text" name="ulp-full-name" id="full-name">
// </div>

exports.onExecutePreUserRegistration = async (event, api) => {
  const fullName = event.request.body['ulp-full-name'];
  if(!fullName) {
    api.validation.error("invalid_payload", "Missing Name");
    return;
  }

  api.user.setUserMetadata("fullName", fullName);
};

Learn more

Use Dynamic Variables to Internationalize Custom Form Elements

Brand Customization

Code Customization

Third-Party Customization

Customize Signup and Login Prompts

Before you start

Use Cases

Terminology

Use the Management API to Manage Partials

Style and Validate Form Inputs

Client-Side Validation

Localize Content

Create or Update a Custom Text Variable

Use a Custom Text Variable in a Partial

Validate and Save Captured Data

Save to User Metadata

Learn more

Brand Customization

Code Customization

Third-Party Customization

Before you start

​Use Cases

​Terminology

​Use the Management API to Manage Partials

​Style and Validate Form Inputs

​Client-Side Validation

​Localize Content

Create or Update a Custom Text Variable

Use a Custom Text Variable in a Partial

​Validate and Save Captured Data

Save to User Metadata

​Learn more

Use Cases

Terminology

Use the Management API to Manage Partials

Style and Validate Form Inputs

Client-Side Validation

Localize Content

Validate and Save Captured Data

Learn more