Google Tag Manager Audit Checklist

Container Health & Performance

A rigorous Google Tag Manager audit begins with a structural analysis of the container itself. Evaluating container size is critical—bloated workspaces significantly degrade client-side performance, impacting Core Web Vitals. An audit must identify and consolidate redundant tags, remove unused variables, and verify that triggers are optimally configured using precise regular expressions rather than overly broad DOM element matches.

DataLayer & Schema Validation

The integrity of your tracking relies entirely on dataLayer health. The audit checklist must mandate validation of the dataLayer.push() syntax across all critical conversion paths. This involves verifying that e-commerce payloads adhere strictly to the GA4 schema, ensuring numerical values aren't parsed as strings, and confirming that no race conditions exist between the container load sequence and the underlying application rendering lifecycle.

Security & Compliance Verification

Modern GTM audits must thoroughly evaluate data privacy compliance and security configurations. A complete review requires checking for the leakage of Personally Identifiable Information (PII) into URL parameters or custom dimensions. Additionally, the audit must verify that Consent Mode v2 correctly restricts tag execution based on real-time consent states, and that any Custom HTML tags are appropriately sandboxed or replaced by secure Custom Templates.