@teamhanko/hanko-elements NPM

Hanko Elements

Provides web components that will bring a modern login and registration experience to your users. It integrates the Hanko API, a backend that provides the underlying functionalities.

Features

User Authentication: Provides a secure and user-friendly way to handle user authentication within web applications.
Authentication Flows: Supports various authentication flows, including passwordless authentication and biometric authentication.
Web Component Library: Offers customizable web components that can be easily integrated into web applications.
Profile Management: Allows users to view and manage their profile information through the profile component.
Event Handling: Provides event listeners for authentication and session-related events, enabling customization and control over the user experience.
Localization and Internationalization: Supports multiple languages and provides translation options for a global user base.
Integration Flexibility: Offers versatile choices for integration, including CDN or npm. It supports both TypeScript and non-TypeScript environments, allowing flexibility based on the project requirements.
Customization: Enables customization of visual styles, branding, and user interface elements to align with the overall application design.
Documentation and Support: Offers documentation, example apps, frontend framework integration guides and support via Slack to assist with integration and troubleshooting.

Installation

To use the Hanko Elements module in your project, you can install it via npm, yarn, or pnpm. Alternatively, you can also import the module directly via a CDN.

# npm
npm install @teamhanko/hanko-elements

# yarn
yarn add @teamhanko/hanko-elements

# pnpm
pnpm install @teamhanko/hanko-elements

Usage

To integrate Hanko, you need to import and call the register() function from the hanko-elements module. Once this is done, you can use the web components in your HTML code. For a functioning page, at least the <hanko-auth> element should be placed, so the users can sign in, and also, a handler for the "onSessionCreated" event should be added, to customize the behaviour after the authentication flow has been completed (e.g. redirect to another page). These steps will be described in the following sections.

Importing the Module

To use the web components, you need to register them using the register() function provided by the hanko-elements package.

If you're using a module bundler like webpack or Parcel, you can import the register() function from the @teamhanko/hanko-elements package in your TypeScript or JavaScript file:

import { register } from "@teamhanko/hanko-elements";

If you prefer using a CDN, you can include a script tag with the import statement pointing to the CDN URL where the hanko-elements package is hosted:

<script type="module">
  import { register } from "https://cdn.jsdelivr.net/npm/@teamhanko/hanko-elements/dist/elements.js";
</script>

Registering the Web Components

After importing the register() function, call it with the URL of the Hanko API as an argument to register the Hanko elements with the browser's CustomElementRegistry.

const { hanko } = await register("https://hanko.yourdomain.com");

You can also pass certain options:

const defaultOptions = {
  shadow: true,                    // Set to false if you do not want the web component to be attached to the shadow DOM.
  injectStyles: true,              // Set to false if you do not want to inject any default styles.
  enablePasskeys: true,            // Set to false if you do not want to display passkey-related content.
  hidePasskeyButtonOnLogin: false, // Hides the button to sign in with a passkey on the login page.
  translations: null,              // Additional translations can be added here. English is used when the option is not
                                   // present or set to `null`, whereas setting an empty object `{}` prevents the elements
                                   // from displaying any translations.
  translationsLocation: "/i18n",   // The URL or path where the translation files are located.
  fallbackLanguage: "en",          // The fallback language to be used if a translation is not available.
  storageKey: "hanko",             // The name of the cookie the session token is stored in and the prefix / name of local storage keys
  cookieDomain: undefined,          // The domain where the cookie set from the SDK is available. When undefined,
                                   // defaults to the domain of the page where the cookie was created.
  cookieSameSite: "lax",           // Specify whether/when cookies are sent with cross-site requests.
  sessionCheckInterval: 30000,     // Interval for session validity checks in milliseconds. Must be greater than 3000 (3s).
};

const { hanko } = await register(
  "https://hanko.yourdomain.com",
  defaultOptions
);

Replace "https://hanko.yourdomain.com" with the actual URL of your Hanko API.

Embedding the Web Components

If you have followed the steps mentioned above, you should now be able to place the web components anywhere in the body of your HTML. A minimal example would look like this:

<hanko-auth id="authComponent"></hanko-auth>

<script type="module">
  import { register } from "https://cdn.jsdelivr.net/npm/@teamhanko/hanko-elements/dist/elements.js";

  await register("https://hanko.yourdomain.com");

  const authComponent = document.getElementById("authComponent");
  authComponent.addEventListener("onSessionCreated", () => {
    // redirect to a different page
  });
</script>

The individual web component are described in the following sections.

<hanko-auth>, <hanko-login> and <hanko-registration>

These three web components offer a user-friendly interface for user login or registration. The difference between the components is, that <hanko-auth> has the ability to switch between the login and registration UI, whereas <hanko-login> is dedicated to the login and <hanko-registration> to the registration only.

Markup

Combined UI for login and registration:

<hanko-auth></hanko-auth>

Dedicated UI for the login:

<hanko-login></hanko-login>

Dedicated UI for the registration:

<hanko-registration></hanko-registration>

Attributes

prefilled-email Used to prefill the email input field.
prefilled-username Used to prefill the username input field.
lang Used to specify the language of the content within the element. See Translations.
mode Accepts either "login" or "registration" to initialize the <hanko-auth> component with a login or registration flow, respectively.

<hanko-profile>

A web component that allows to manage emails, passwords and passkeys.

Markup

<hanko-profile></hanko-profile>

Attributes

lang Used to specify the language of the content within the element. See Translations.

<hanko-events>

A web component that allows to bind event handler to certain events, without displaying UI elements. Events can be subscribed to with the <hanko-auth> and <hanko-profile> components in the same manner. Also, you can bind event handler via the frontend-sdk (see next section).

Markup

<hanko-events id="events"></hanko-events>
<script>
  document
    .getElementById("events")
    .addEventListener("onSessionCreated", console.log);
  // more events are available (see "frontend-sdk" docs)...
</script>

Using the Frontend-SDK

The following examples will cover some common use-cases for the hanko-frontend-sdk instance returned by the register() function:

// Validate the current session
const session = await hanko.validateSession();
console.log("Session valid:", session.is_valid, "Claims:", session.claims);

// Retrieve the session token
const token = hanko.getSessionToken();
console.log("Session token:", token);

// Fetch the user profile
const user = await hanko.getUser();
console.log("User profile:", user.user_id, user.emails);

// Log out the user
await hanko.logout();
console.log("User logged out");

// Handle session creation event
hanko.onSessionCreated(({ claims }) => {
    console.log("Session created with JWT claims:", claims);
});

// Handle session expiration event
hanko.onSessionExpired(() => {
    console.log("Session expired, redirecting to login");
});

// Handle user logout event
hanko.onUserLoggedOut(() => {
    console.log("User logged out successfully");
});

// Handle user account deletion event
hanko.onUserDeleted(() => {
    console.log("User account deleted");
});

Please take a look into the frontend-sdk docs, for further details.

UI Customization

CSS Variables

CSS variables can be used to style the hanko-auth and hanko-profile elements to your needs. A list of all CSS variables including default values can be found below:

hanko-auth,
hanko-profile {
  /* Color Scheme */
  --color: #333333;
  --color-shade-1: #8f9095;
  --color-shade-2: #e5e6ef;

  --brand-color: #506cf0;
  --brand-color-shade-1: #6b84fb;
  --brand-contrast-color: white;

  --background-color: white;
  --error-color: #e82020;
  --link-color: #506cf0;

  /* Font Styles */
  --font-weight: 400;
  --font-size: 16px;
  --font-family: sans-serif;

  /* Border Styles */
  --border-radius: 8px;
  --border-style: solid;
  --border-width: 1px;

  /* Item Styles */
  --item-height: 34px;
  --item-margin: 0.5rem 0;

  /* Container Styles */
  --container-padding: 30px;
  --container-max-width: 410px;

  /* Headline Styles */
  --headline1-font-size: 24px;
  --headline1-font-weight: 600;
  --headline1-margin: 0 0 1rem;

  --headline2-font-size: 16px;
  --headline2-font-weight: 600;
  --headline2-margin: 1rem 0 0.5rem;

  /* Divider Styles */
  --divider-padding: 0 42px;
  --divider-visibility: visible;

  /* Link Styles */
  --link-text-decoration: none;
  --link-text-decoration-hover: underline;

  /* Input Styles */
  --input-min-width: 14em;

  /* Button Styles */
  --button-min-width: max-content;
}

CSS Shadow Parts

In addition to CSS variables, you can utilize the ::part selector to customize the styles of various elements.

Please note that shadow parts only function when the web components are attached to the shadow DOM, which is the default behavior. You can enable the shadow DOM for the components using the following code snippet:

register("https://hanko.yourdomain.com", { shadow: true });

// equals

register("https://hanko.yourdomain.com");

List of all shadow parts

The following parts are available:

container - the UI container
headline1 - the "h1" headlines
headline2 - the "h2" headlines
paragraph - the paragraph elements
button - every button element
primary-button - the primary button
secondary-button - the secondary button on the email login page
input - every input field
text-input - every input field not used for passcodes
passcode-input - the passcode input fields
link - the links in the footer section
error - the error message container
error-text - the error message
divider - the horizontal divider on the login page
divider-text - the divider text
divider-line - the line before and after the divider-text
form-item - the container of a form item, e.g. an input field or a button

Using shadow parts

The following examples demonstrate how to apply styles to specific shadow parts:

Example 1

This example demonstrates how to force the input fields and buttons within the hanko-auth component to stack vertically. The ::part(form-item) selector targets the form-item shadow part within the hanko-auth component, which is applied using the tag name.

<style>
  hanko-auth::part(form-item) {
    /* Force the input fields and buttons are on top of each other */
    min-width: 100%;
  }
</style>

<hanko-auth></hanko-auth>

Example 2

This example shows how to adjust the main headlines for all hanko components by targeting the headline1 shadow part. The .hankoComponent::part(headline1) selector applies the styles to the headline1 shadow part within elements that have the hankoComponent class.

<style>
  .hankoComponent::part(headline1) {
    /* Adjust the main headlines for all hanko components */
    font-size: 1.3em;
    font-weight: 400;
  }
</style>

<hanko-auth class="hankoComponent"></hanko-auth>
<hanko-profile class="hankoComponent"></hanko-profile>

Example 3

In this example, a box shadow is applied to the button shadow part of the hanko-auth component when hovering over it. The #hankoAuth::part(button):hover selector targets the button shadow part within the hanko-auth component using the ID selector #hankoAuth and applies the styles when the :hover pseudo-class is active.

<style>
  #hankoAuth::part(button):hover {
    box-shadow: 3px 3px 2px #888;
  }
</style>

<hanko-auth id="hankoAuth"></hanko-auth>

CSS Classes (not recommended)

There is also the possibility to provide your own CSS rules when the web component has not been attached to the shadow DOM:

register("https://hanko.yourdomain.com", { shadow: false });

Please take a look at the CSS example file to see which CSS rules can be used. If you only want to change specific properties you can override the predefined ones. For example if you like to change the background color, include the following CSS rule:

.hanko_container {
  background-color: blue !important;
}

Also, you can prevent injecting any styles:

register("https://hanko.yourdomain.com", {
  shadow: false,
  injectStyles: false,
});

so you don't need to override properties but provide the entirety of CSS rules:

.hanko_container {
  background-color: blue;
}

/* more css rules... */

If this is your preferred approach, start with the CSS example file, change everything according to your needs and include the CSS in your page.

Keep in mind we made CSS classes available and added light DOM support only because a Safari bug is breaking the autocompletion of input elements while the web component is attached to the shadow DOM. You would normally prefer to attach the component to the shadow DOM and make use of CSS parts for UI customization when the CSS variables are not sufficient.

Translations

Default Behavior

The hanko-elements package includes English translations by default and the lang attribute can be omitted.

Script:

register("https://hanko.yourdomain.com");

Markup:

<hanko-auth></hanko-auth>

Installing Additional Translations

Translations are currently available for the following languages:

"bn" - Bengali
"de" - German
"en" - English
"fr" - French
"it" - Italian
"ptBR" - Brazilian Portuguese
"zh" - Simplified Chinese

You can import them individually:

// Replace the paths below with
// "https://cdn.jsdelivr.net/npm/@teamhanko/hanko-elements/dist/i18n/{en|de|all|...}.js"
// if you're using CDN.

import { bn } from "@teamhanko/hanko-elements/i18n/bn";
import { de } from "@teamhanko/hanko-elements/i18n/de";
import { en } from "@teamhanko/hanko-elements/i18n/en";
import { fr } from "@teamhanko/hanko-elements/i18n/fr";
import { ptBR } from "@teamhanko/hanko-elements/i18n/pt-BR";
import { zh } from "@teamhanko/hanko-elements/i18n/zh";

Or import all translations at once:

import { all } from "@teamhanko/hanko-elements/i18n/all";

After importing, provide the translations through the register() function:

register("https://hanko.yourdomain.com", { translations: { bn, de, en, fr, it, ptBR, zh } });

// or

register("https://hanko.yourdomain.com", { translations: all });

You can now set the lang attribute of the element to the desired language:

<hanko-auth lang="de"></hanko-auth>

Modifying Translations

You can modify existing translations as follows:

import { en } from "@teamhanko/hanko-elements/i18n/en";

en.errors.somethingWentWrong = "Aww, snap!";

register("https://hanko.yourdomain.com", { translations: { en } });

Adding New Translations

If you need to create a new translation, pass an object that implements (or partially implements) the Translation interface.

Script:

import { all } from "@teamhanko/hanko-elements/i18n/all";
import { Translation } from "@teamhanko/hanko-elements"; // if you're using typescript

const myLang: Translation = {...}

register("https://hanko.yourdomain.com", {translations: {...all, myLang}});

Markup:

<hanko-auth lang="myLang"></hanko-auth>

Using External Files

For languages provided via the element's lang attribute, or via the fallback language option, that are not included in the object passed to the translations option, the component will fetch a JSON file from the location specified by the translationsLocation option. For example, if "en" is missing due to an empty object being passed, as shown in the example below, the component will fetch a file named "/i18n/en.json".

Script:

register("https://hanko.yourdomain.com", {
  translations: {}, // An empty object, so even the default "en" translation won't be available.
  translationsLocation: "/i18n", // A public folder containing language files, e.g., "en.json".
});

Markup:

<!-- Will fetch "/i18n/en.json" -->
<hanko-auth lang="en"></hanko-auth>

Fallback Language

The fallbackLanguage option is used to specify a fallback language for the web components when translations are missing or incomplete for a particular language. By setting the fallbackLanguage option to a valid language string like "en" or "de", the missing translation strings will be automatically retrieved from the specified fallback language. When the translation for the specified fallbackLanguage is not available in the translations option, the web components will attempt to fetch it from an external file.

Script:

import { en } from "@teamhanko/hanko-elements/i18n/en";
import { Translation } from "@teamhanko/hanko-elements";

const symbols: Partial<Translation> = {
  labels: { continue: "➔" },
};

register("https://hanko.yourdomain.com", {
  fallbackLanguage: "en",
  translations: { en, symbols },
});

Markup:

<!-- Will appear in English, but the "continue" button label will be "➔"  -->
<hanko-auth lang="symbols"></hanko-auth>

Translation of outgoing Hanko emails

If you use Hanko Elements the language supplied to the lang attribute of any of the components is also used to convey to the Hanko API the language to use for outgoing emails. If you have disabled email delivery through Hanko and configured a webhook for the email.send event, the value for the lang attribute is reflected in the JWT payload of the token contained in the webhook request in the language claim.

Live Demo

Take a look at our live demo.

Examples

The following example implementations are currently available, demonstrating integration into both vanilla JavaScript and frontend framework environments:

A single HTML file that implements most of the features mentioned on this page, with all the key details explained in the comments. You can host it on any HTTP server, including locally.
Todo apps that demonstrate how integration works in various frontend frameworks and provide insights on managing backend communication and JWT validation.

Frontend framework integrations

To learn more about how to integrate the Hanko elements into frontend frameworks, see our guides in the official documentation and our example applications.

Exports

The @teamhanko/hanko-elements package exports the functions and interfaces listed below and additionally every declaration provided by the frontend-sdk.

Functions

register - A function to register the web components with the browser's custom element registry.

Interfaces

RegisterOptions - represents the options of the register() function.
RegisterResult - represents the return value of the register() function.
Translation - represents a translation that can be provided through the RegisterOptions.
HankoAuthElementProps - represents the <hanko-auth> element properties.
HankoProfileElementProps - represents the <hanko-profile> element properties.
HankoEventsElementProps - represents the <hanko-events> element properties.

Browser support

Safari
Firefox
Opera
Chromium-based browsers (Chrome, Edge, Brave,...)

Bugs

Customizable UI: In Chrome the ::part selector is not working in combination with some pseudo classes. E.g. :disabled is currently broken. See: chromium-issue-#1131396, chromium-issue-#953648

Found a bug? Please report on our GitHub page.