It injects an iframe into your website and visualizes the Data Layer in real-time. It tells you exactly which tags fired on a pageview, which tags didn't fire (and the specific rule that prevented them), and shows the exact HTTP requests dispatched to Google Analytics or Facebook. If data is broken, Tag Assistant is the tool you use to find the leak.

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Related Terms

DebugView

A real-time diagnostic hub inside the GA4 admin that lets you monitor events, parameters, and user properties exactly as they arrive from testing devices.

Data Layer

A JavaScript array that temporarily holds structured data on your website so Google Tag Manager can accurately read it and send it to analytics tools.

nld.

NiceLookingData

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Definitions

What is Tag Assistant?

A Google Chrome extension and web service that allows you to simulate a user session, trace tag firing rules, and diagnose tracking implementations.

Google Tag Assistant is the primary workbench for any analytics engineer. When you hit "Preview" in Google Tag Manager, it launches Tag Assistant.