Google Tag gateway gtm script

I want to use google tag gateway and everything works so far, but I am wondering one thing: currently, both the gtm-script and the first-party script get loaded. The gtm script is included in the site, so this on first sight isn't weird. But what is the expected behaviour? Should cloudflare replace the default script?
This is not explained in the docs unfortunately, so I'd much appreciate guidance on this

SuperHelpflare•12/4/25, 4:10 PM

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According to the documentation (https://community.cloudflare.com/t/798993), when the GTM feature is enabled, a script is automatically injected into all pages at the zone level (including the apex domain and all subdomains). The setUpTagsetUpTag option controls the content of the injected script.

If setUpTagsetUpTag is set to

false

false

, a base script is injected, allowing you to implement your own GTM initialization logic. This is useful for selectively applying GTM to specific parts of your website.

If setUpTagsetUpTag is set to

true

true

, the standard GTM initialization script is injected, which includes the line w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});.

It is not explicitly stated in the documentation that Cloudflare should replace the default script. However, it is mentioned that the injected script is added to the page, in addition to any existing scripts.

Therefore, it is expected behavior that both the GTM script and the first-party script are loaded, as you have observed. If you want to avoid loading the default script, you can try setting setUpTagsetUpTag to

false

false

and implementing your own GTM initialization logic.

Sources

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Google Tag gateway gtm script

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