Immutable parameters

This document is for developers who use server-side tagging and want to learn more about server-side tagging event parameters.

Do not modify the event data parameters listed on this page. Deleting, augmenting, or modifying these parameters may adversely affect the functionality of Google tags and downstream products (e.g. Google Ads, Google Analytics, Floodlight). The name, type, and products of all event data parameters are subject to change.

Name Type Products
client_id string Google Analytics, Google Ads
event_name string Google Analytics, Google Ads, Floodlight
gclid string Google Analytics, Google Ads, Floodlight
transaction_id string Google Ads, Floodlight
ip_override string Google Analytics
event_location object Google Analytics, Google Ads
country string Google Analytics, Google Ads
region string Google Analytics, Google Ads
user_agent string Google Analytics, Google Ads
user_data_mode string Google Analytics, Google Ads
client_hints object Google Analytics, Google Ads
x-ga-protocol_version string Google Analytics
x-ga-temp_client_id string Google Analytics
x-ga-measurement_id string Google Analytics
x-ga-gtm_version string Google Analytics
x-ga-page_id number Google Analytics
x-ga-request_count number Google Analytics
x-ga-gcs string Google Analytics
x-ga-gcu string Google Analytics
x-ga-dma string Google Analytics
x-ga-dma_cps string Google Analytics
x-ga-npa string Google Analytics
x-ga-did string Google Analytics
x-ga-gdid string Google Analytics
x-ga-edid string Google Analytics
x-ga-ecid string Google Analytics
x-ga-em string Google Analytics
x-ga-tfd number Google Analytics
x-ga-lps boolean Google Analytics
x-ga-system_properties object Google Analytics
x-sst-system_properties object Google Analytics, Google Ads, Floodlight
x-sst-prehit_properties object Google Analytics, Google Ads, Floodlight