gtm-debugging

Enable GTM Preview mode, trigger the action you're testing, then review the Preview panel to see which tags fired, what variables resolved, and identify blocked or unmet triggers. Use Tag Assistant simultaneously to diagnose trigger conditions and variable errors in real time.

Use Preview mode to validate tag firing and data layer sequencing in a safe environment. Trigger test events, inspect the data layer state, verify event order, and confirm all expected tags fire with correct variable values before pushing changes live.

Inspect the data layer in Preview mode to confirm variables exist and contain expected values at the time tags fire. Check Tag Assistant for variable resolution errors, validate data layer timing against tag sequencing, and ensure dependent tags fire only after prerequisite data populates.

Yes. Preview mode shows which tags fired and their variable states; Tag Assistant surfaces trigger and variable errors in real time. Use both in parallel to reproduce issues, validate configurations, and confirm behavior across different data layer states before publication.

Enable Preview mode and inspect the event sequencing timeline to identify timing or dependency issues. Verify data layer state at each step, check tag trigger conditions, and use Tag Assistant to confirm variables resolve when expected and tags execute in the correct sequence.