The User-ID feature lets you associate your own identifiers with individual users so you can connect their behavior across different sessions and on various devices and platforms.
This article describes how to send user IDs from your website once you've generated the user IDs. To learn more about the User-ID feature, see Measure activity across platforms. To learn how to set a user ID for an app, see Set a user ID instead.
Before you begin
This guide assumes that you've done the following:
- Create a Google Analytics 4 account and property
- Create a web data stream for your website
- Place the Tag Manager snippets on your website
- Install the Google tag in Tag Manager
It also assumes that you have the following:
- Access to the Tag Manager container for the website
- The Editor (or above) role to the Google Analytics account
Send user IDs
Step 1: Update your data layer
Before you send user IDs to Analytics, make the user_id
available in your
data layer on your website.
dataLayer.push({ 'user_id': 'USER_ID' });
Step 2: Create a data layer variable
In Google Tag
Manager, click Variables.
In the User-Defined Variables section, click New.
Click Variable Configuration > Data Layer Variable.
Enter a name for the variable at the top.
In the Data Layer Variable Name field, enter a name for your user ID variable (such as "user_id").
Click Save.
Step 3: Modify your Google tag
Finally, modify the Configuration tag so all events associated with the tag use the Data Layer variable:
- In Tag Manager, click Tags.
- Select your Google tag.
- Under Configuration settings section, add a new row with the following
parameters:
- Parameter:
user_id
- Value: Select the Data Layer variable you created.
- Parameter:
- Click Save.
- Click Submit to publish the changes.