GA4 Encyclopedia. Events. Parameters. GTM implementation.

Google Analytics 4 Events Encyclopedia

Complete guide to GA4 events with GTM implementation

Version: 2026 0 events 0 categories

Browse all Google Analytics 4 events or select a category above.

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Quick reference

GA4 Limits

  • 500 unique event names
  • 25 parameters per event
  • 200 products in items array
  • 40 characters - max event name
  • 100 characters - max parameter value

Best Practices

  • Always clear ecommerce: null
  • Use unique transaction_id
  • Use snake_case in names
  • Test in DebugView before production
  • Register Custom Dimensions

Reserved prefixes

  • google_
  • ga_
  • firebase_
  • gtag_