GTM Checker Extension

The GTM Checker Extension analyzes a website’s Google Tag Manager setup to verify correctness and readiness for SEO and analytics use. It targets marketing teams, SEO analysts, and developers who need confidence that GTM is present, correctly configured, and compliant with privacy requirements. It is useful after site launches, migrations, or governance reviews for tag governance.
Core logic detects a GTM embed, inspects dataLayer usage, maps tags to triggers, and evaluates misconfigurations. It provides an overall score, a GTM status, and a structured list of issues with severity, distinguishing essential checks from optional ones. Optional features include crawl depth, performance impact estimates, and exportable reports for stakeholders.
Outputs deliver a structured result with data_layer_usage, tag coverage data, and privacy indicators. This tool is designed for enterprise and agency contexts where reproducible audit trails and clear governance documentation are required.
The tool assumes public access to the site and does not execute client side code. It relies on publicly available source and network data to produce conservative assessments that support remediation planning.