Question 1

What is a GA4 event?

Accepted Answer

In Google Analytics 4, every interaction is an event — page views, scrolls, clicks, form submissions, purchases. Events have a name (e.g. 'purchase') and up to 25 parameters (e.g. value, currency, items). You collect events via gtag.js, Google Tag Manager, or the Measurement Protocol.

Question 2

gtag.js vs GTM dataLayer vs Measurement Protocol — when to use which?

Accepted Answer

gtag.js is the direct GA4 snippet — call gtag('event', ...) from your site's JavaScript. GTM dataLayer is for sites using Google Tag Manager — push events to dataLayer and GTM forwards them. Measurement Protocol is for server-side tracking (offline conversions, POS systems, IoT) — POST events to Google's endpoint.

Question 3

What naming rules apply to GA4 events and parameters?

Accepted Answer

Event names: must start with a letter, contain only letters/numbers/underscores, max 40 characters. Parameter names: same rules, max 40 characters. Reserved event names (page_view, scroll, click, etc.) trigger automatic collection — use them only if you're manually sending those events.

Question 4

How many parameters can an event have?

Accepted Answer

Up to 25 parameters per event (was 100 in early GA4, reduced). Custom parameters must be registered in the GA4 admin (Configure → Custom definitions) to appear in reports. Event-scoped custom dimensions are recommended for any parameter you want to filter or report on.

Question 5

What extra features does this tool have compared to others?

Accepted Answer

(1) Event name presets (page_view, scroll, click, form_start, form_submit, purchase). (2) Custom parameters (key-value pairs). (3) gtag.js code generation. (4) GTM dataLayer push code generation. (5) Measurement Protocol JSON payload. (6) Event + param name validation (length, characters). (7) Copy each code snippet. (8) Stats — param count. (9) History (localStorage, last 20). (10) Shareable URL — encode form in fragment.

Question 6

Is my data sent anywhere?

Accepted Answer

No. All code generation is pure string manipulation. We don't send events to Google. History is stored in localStorage on this device only.

GA4 Event Builder

Event presets reference

How to use

Event presets reference