🧪 GTM Test Lab

Vata Analytics — Tag Manager verification page

This page loads any GTM container so you can verify tags fire correctly using GTM Preview mode before handing the snippet to a client. Change the GTM ID in the source HTML to test a different container.

📡 Configuration

GTM Container ID
Page URL
Test loaded at

✅ GTM Load Status

window.dataLayer exists
dataLayer event count
GTM script tag injected
google_tag_manager object
Conversion Linker cookie (_gcl_aw)

🔗 URL Parameters (gclid + tracking)

gclid
gbraid
wbraid
cmc_vid (ClickMagick)
sub2 (ad name)
All inbound params

🚀 Fire Test Events

Click a button to push an event to dataLayer. Watch GTM Preview to confirm the tag fires.

📜 Event Log

📋 How to Use This Page

To verify your GTM container works:

  1. Make sure window.GTM_ID in the HTML source matches the container you want to test
  2. Deploy this page to Cloudflare Pages (see README.md for the wrangler command)
  3. Open tagmanager.google.com → your container → click Preview (top right)
  4. Enter this page's URL into Preview when prompted, click Connect
  5. This page reloads — you should see "Tag Assistant connected" in the bottom-right
  6. Switch to the Tag Assistant tab → verify Conversion Linker fires on Container Loaded
  7. Click "Simulate Purchase" above → verify the Google Ads Conversion Tracking tag fires
  8. If both fire green, your container is good to publish and hand off