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Learn how to effectively send user IDs through Google Tag Manager for Google Analytics Web + App using dataLayer.
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How to Successfully Send User ID in Google Tag Manager Collect Requests

When setting up Google Tag Manager (GTM) for Google Analytics Web + App, many users encounter issues with sending User IDs effectively. This problem can lead to incomplete data tracking, making it challenging to analyze user behavior accurately. In this guide, we will explore a common issue related to sending User IDs through GTM and provide a step-by-step guide on how to resolve it.

Identifying the Problem

In this scenario, a user has created a dataLayer variable named "User ID" and attempted to push the user ID into the dataLayer. Despite following the correct steps, the User ID fails to appear in the collect request sent to Google Analytics. Here’s how the configuration looked:

Name (for use in GTM): User ID

Variable name: user_id

Version: 2

The user attempted the following code to push the user ID into the dataLayer:

[[See Video to Reveal this Text or Code Snippet]]

Additionally, they tried:

[[See Video to Reveal this Text or Code Snippet]]

However, neither code snippet successfully sent the User ID via the collect request.

Solution: Properly Sending User ID through GTM

The issue stems from the timing of when the user ID is sent to the dataLayer and how triggers are set up in GTM. Here’s how to properly implement the User ID tracking in GTM.

Step 1: Ensure Proper Timing of dataLayer Push

It’s essential that the User ID is pushed to the dataLayer after the GTM snippet is fully loaded. This means the dataLayer push must occur after the gtm.js script is executed.

Step 2: Create a GTM Trigger for the User ID

To ensure that the User ID is accurately captured, you need to set up a custom trigger in GTM that listens for the dataLayer event when the User ID is pushed. Here are the steps:

Go to your GTM dashboard.

Select Triggers on the left panel.

Create a New Trigger:

Type: Custom Event

Event Name: The name you will trigger on (for example, 'userIdSet')

This trigger fires on: All Custom Events

Step 3: Update Your JavaScript Code

Next, modify your JavaScript code to include an event when pushing the User ID in the dataLayer. Here’s how to do it:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Create a GTM Variable for User ID

Go to Variables in GTM

Create a New Variable:

Variable Type: Data Layer Variable

Variable Name: user_id

Data Layer Variable Name: user_id

Step 5: Configure Your Google Analytics Tag

Finally, you need to ensure that your Google Analytics tag is set to use the User ID:

In GTM, go to Tags and select your Google Analytics tag.

Under Fields to Set, add a new field:

Field Name: user_id

Value: Select the variable created in the previous step that holds the User ID.

Conclusion

By following these steps, you should be able to successfully send the User ID through GTM to Google Analytics Web + App. Ensuring the correct timing of the dataLayer push and setting appropriate triggers are key to successful User ID tracking in your analytics setup.

With accurate tracking, you can gain valuable insights into user behavior and improve your marketing strategies accordingly. If you encounter any issues, double-check your configurations and reach out for support if needed.

Now you're ready to unlock the potential of user tracking with Google Tag Manager!