Debugging Gtm

Resources and tools for the query "Debugging Gtm". Use Tag Companion's visual CSS selector helper and GTM container file generator (no coding needed), or browse our expert guides written for marketers, not developers.

February 1, 2026 Admin

It Worked in Google Tag Manager Preview Mode — and Still Broke in Production

You did everything right, tested it. Preview said it fired. You published. It broke anyway. That feeling is not a fluke. It's a design gap in GTM that nobody warns you about until you've lived it. And knowing how to know if GTM is working is harder than it should be, because the tool GTM gives you to answer that question doesn't actually answer it.

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