What is the difference between ‘gtag.js’ implementation and ‘Google Tag Manager’ implementation for GA4 in terms of data layer?

Google Analytics GA4 Hard

Google Analytics GA4 — Hard

What is the difference between ‘gtag.js’ implementation and ‘Google Tag Manager’ implementation for GA4 in terms of data layer?

Key points

  • gtag.js directly sends events, GTM uses dataLayer
  • GTM offers more flexibility and separation
  • gtag.js uses JavaScript function calls
  • GTM maps dataLayer values to GA4 event parameters

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