GTM Inspector

The GTM Inspector analyzes Google Tag Manager containers to validate the correctness of tags, triggers, and data layer events. It accepts a container export JSON or a live container URL with read access and does not modify the source container. It produces a health-oriented report detailing tag coverage, firing logic, and data layer event alignment.
The tool builds a unified model of the GTM configuration, identifies missing or orphaned elements, and surfaces inconsistencies across environments or versions. It emphasizes data layer event names, parameter presence, and trigger conditions to reduce measurement drift.
Use cases include pre-launch audits, deployment verification, post-implementation troubleshooting, and cross-environment reconciliation to ensure measurement fidelity and predictable tag behavior.
The tool's core logic applies deterministic parsing of GTM data structures, cross-checks tag firing rules with triggers, verifies variable usage, and catalogs data layer fields. It also offers optional cross-environment delta reporting and a prioritized list of fixes.
Inputs can be exported from GTM UI, or retrieved via API, enabling batch analysis across multiple containers. The outputs include a summary health score, per-tag diagnostic details, data layer event mapping, and a cross-environment delta matrix. The reporting format supports downstream automation and integration with CI pipelines, version tracking, and stakeholder-ready exports.
Security and privacy: It does not store data beyond the current analysis, and any persisted results are under user control. Performance considerations: The inspection scales with container size; larger containers may require longer processing time and optional batch mode.