Google Tag Manager Expert Services
GTM Data Layer JavaScript Error Tracking
JavaScript error monitoring and 404 tracking through GTM data layer
Track JavaScript errors and 404s with your GTM data layer. Monitor site health, identify tracking failures, and catch errors before they impact conversions.
Ready to Get Your Tracking Set Up Properly?
What's Included in This Service
Everything you need for accurate, reliable tracking — delivered end-to-end.
window.onerror and unhandledrejection capture
404 page error events
Tracking script failure detection
Error event to GA4 custom event mapping
Error rate alerts in GA4
Error context variables (page, browser, user type)
How We Work
Our proven 4-step process delivers results every time.
Discovery & Audit
We review your existing tracking setup, identify gaps and issues, and define the exact scope of work needed.
Implementation Plan
We design the data layer schema, tag architecture, and consent configuration before touching anything.
Build & QA
All tags, triggers, and variables are built in a GTM workspace and verified in Preview mode before publishing.
Verify & Handover
Test conversions, GA4 DebugView confirmation, and full documentation handed to your team.
Why Choose Adslytics?
Google Tag Manager Experts Only
Our GTM experts focus exclusively on GTM, GA4, and conversion tracking — not generalist digital marketing.
Data-Verified Results
Every implementation is cross-referenced against backend data — not just assumed to be working.
Full Documentation
You receive a complete implementation specification — not a black box you are dependent on us to maintain.
Fast Turnaround
Most setups and audits are delivered within 2–5 business days, not weeks.
What Our Clients Say
Real results from real businesses.
"Adslytics did a great job with our GA4 analysis and report. They were able to put complex analytics data into a very understandable document for our client. Highly recommend!"
Eric H.
Digital Agency Owner
"The team was quick with responses, very knowledgeable about issues, and helpful throughout the process. I appreciated their work habits and would hire Adslytics again."
Nick T.
Marketing Manager
"Adslytics is a very professional agency that managed our project successfully. They delivered exactly what was promised and I will definitely hire them again in the future!"
Hady M.
E-commerce Business Owner
Ready to Get Started with GTM Data Layer JavaScript Error Tracking?
Get accurate conversion tracking that powers smarter ad decisions. Book a free 30-minute consultation.
Frequently Asked Questions
Related Services
GTM Data Layer JavaScript Error Tracking — Done Right, First Time.
Stop losing revenue to broken tracking. Get it fixed today.
Talk to Us, It's Free
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Business Hours
Our support Hotline is available 24 Hours