What are _ga4 cookies? _ga versus _gid and its bigquery export mapping; ga4 cookies explained
GA4 uses first-party cookies set by Google Analytics, and the raw event data is exported into Google BigQuery. Below is the practical mapping you need for analysis. 1. _ga Cookie → user_pseudo_id Example: _ga=GA1.1.123456789.1699999999 The important part is the Client ID: In BigQuery It maps to: user_pseudo_id This is GA4’s device-level identifier Equivalent to the … Read more