Important: Tag Assistant Legacy and Tag Assistant Companion will be combined into a single extension that supports both sets of features. If you have both of these extensions installed, the Tag Assistant Companion will be uninstalled automatically after the Tag Assistant Legacy extension is updated. The Tag Assistant Companion extension will still work, but will be deprecated in 2025.
The Tag Assistant extension will be the unified Chrome extension solution for Tag troubleshooting. Install the Tag Assistant extension.
Once you've started a debugging session in Google Tag Assistant, you'll be presented with a variety of information about your website's tags and events. This guide walks you through the different sections and features of the Tag Assistant interface, explaining how to interpret the data and use it to troubleshoot and optimize your tag implementation.
About the Tag Assistant side panel
Once you’ve added and clicked the Tag Assistant extension, a panel will open on the right side of your browser, displaying the tags firing on the page. The Troubleshoot tag button opens a Tag Assistant tab that shows the current user journey and enables a more in depth investigation.
About the "Tag Assistant" tab
When you click Troubleshoot tag, a new tab will open where you will see the default "Summary" view with an overview of events and tag information for the requested page. If multiple Google tags or Tag Manager containers are detected, select one to see all hits for that specific Google tag or container.
Note: Browser events may be applied to all containers, but the hits are filtered by the container that is selected.
The left side of the screen displays a list of events. The "Output" section will display a card for each hit detected for the selected ID.
Events are grouped by the page where they took place. Click on a page title in the left navigation bar to view a page-level summary. A new page group is added to the top of the list as the user navigates to another page in the site that has the Google tag on the page.
Events appear in the order they were fired and are numbered accordingly. Events marked with a 
The API Call shows the JavaScript that was used to configure data for the event selected, which will be either a gtag() call or a datalayer.push() call.
Output will show where hits were sent, updates to the data layer, and any errors.
Hits detail
Hits Sent will show where a particular hit was sent, and what kind of hit it was:
When you click on this hit, a detail window will appear. This view shows detail about the parameters that were sent with each hit.
Data Layer
The Data Layer tab shows values found in the dataLayer object. When Summary is selected, it will display the current state of the data layer, as well as the data that was pushed to the data layer for each event.
