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Clerk.js v2 is in Developer Preview

In this stage, Clerk.js v2 is being tested by select developers and we may change features and interfaces based on their feedback.

Clerk.js is build to make integration of onto any store frontend fast and enjoyable for developers. Clerk.js does all the heavy lifting, such as making network requests, gracefully handling errors, rendering into the DOM and applying click and behavioral tracking out of the box.

Embedding Clerk.js

If you use an official extension or plugin this is injected by default. You can find your stores specific embed code under your store settings at

Else insert the following snippet on every page just before the </head> tag.

  <!-- Start of E-commerce Personalisation tool - -->
  <script type="text/javascript">
      var e=d.createElement('script');e.type='text/javascript';e.async=true;
      var s=d.getElementsByTagName('script')[0];s.parentNode.insertBefore(e,s);

    Clerk('config', {
  <!-- End of E-commerce Personalisation tool - -->

This exposes the global Clerk object that we do all of our work from.

Configuring Clerk.js

Clerk.js is configured by default

If you use one of your plugins, or copy-paste the tracking code from, Clerk.js is already configured.

This is only for if you need more advanced customisation.

The object can be configured by the Clerk('config',' ') method with the following options as a object parameter:



Your store's public API key.


The visitor's visitor id. This will be auto-generated by default.


Global configuration of the language to be used if applying multiple languages. This will be auto detected by default from the page's language meta information.


A mapping of custom template filters


true if Clerk.js should automatically detect emails from input fields, else false. This is used for ie. abandoned basket and other personalised emails. falseby default.

Multiple configuration calls will only update the given configuration options and leave the others intact
When adding or editing configurations, it takes a dictionary as follows:.

Clerk('config', {
  key: 'YOUR_API_KEY',
  visitor: 'ABC123',
  language: 'spanish',
  collect_email: true,
  filters: {
    format_price: function(price) {
      return price.toFixed(2).toString();
    uppercase: function(string) {
    	return string.toUpperCase();

Clerk can also be configured for live testing by using url parameters. Using a # at the end of url and clerkjs: you can change all elements of the configuration. For example, the debugger can be enabled by entering #clerkjs:debug.ui=on at the end of the url address.