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Google's official GA4 Event Builder for testing and validating event payloads before adding them to your site. You build the event, set custom parameters, and fire test hits against your GA4 property to confirm they land correctly. Free and the only fully-trusted source for clean event QA.
How to use it
Open the GA4 Event Builder and sign in with the Google account that has access to your GA4 property.
Pick your property from the dropdown.
Build the event by entering its name, then add custom parameters one by one.
Set test values for each parameter that match what your site will pass in production.
Fire the test event and confirm it appears in GA4's DebugView within thirty seconds.
Export the validated event spec as a JSON snippet for your developer to implement on the site.
Best-fit use cases
Event QA pre-launch
Validate every event before pushing tracking code live to avoid weeks of bad data.
Developer handoff
Generate clean JSON specs that engineers can implement without ambiguity.
Migration validation
Confirm events still fire correctly after a CMS migration or major site refactor.
GTM debugging
Diagnose why a Google Tag Manager event is not landing as expected in GA4.