Technical FAQ

Technical questions about ListenLayer implementation.

Does ListenLayer slow down my site?

No. Our script is:

• Under 10KB gzipped

• Loaded asynchronously

• Doesn't block page rendering

Typical impact: < 50ms additional load time.

How does form detection work?

ListenLayer detects forms by:

1. Scanning the DOM for <form> elements

2. Identifying form platforms (Gravity Forms, HubSpot, etc.)

3. Attaching event listeners for submissions

4. Capturing field values (excluding sensitive fields)

What fields are captured?

By default, we capture:

• Form ID and name

• Non-sensitive field values

• Submission timestamp

We automatically exclude:

• Password fields

• Credit card numbers

• SSN patterns

Can I track Single Page Apps (SPAs)?

Yes. For SPAs like React, Vue, or Angular:

// Call on route change
_ll('page', {
  title: document.title,
  url: window.location.href
});

Or enable auto-tracking:

_ll('init', 'ACCOUNT_ID', {
  trackRouteChanges: true
});

Is there a npm package?

Yes:

npm install @listenlayer/sdk

What browsers are supported?

• Chrome 60+

• Firefox 55+

• Safari 11+

• Edge 79+

IE11 is supported with polyfills.

How do I debug tracking?

1. Enable debug mode:

   _ll('debug', true);

2. Open browser console to see all events

3. Use the real-time debugger in your dashboard

What's the API rate limit?

Plan	Limit
Free	100 req/min
Pro	1,000 req/min
Enterprise	Custom