DataLayer Lens

A powerful, beautiful tool for monitoring GTM dataLayer events in real-time

Monitor Google Tag Manager dataLayer events in real-time. Essential for analytics developers, QA engineers, and GTM implementers. DataLayer Lens is a powerful debugging tool for anyone working with Google Tag Manager and dataLayer implementations. Monitor, inspect, and validate your dataLayer pushes in real-time as you interact with any website. Key Features • Real-time event monitoring — Watch dataLayer events appear instantly as they're pushed, with clear visual indicators for new activity. • Multiple viewing modes — Choose between an on-page overlay, a persistent side panel, or integration with Chrome DevTools to suit your workflow. • Smart event categorisation — Events are automatically colour-coded by type (page views, clicks, e-commerce transactions, form submissions, and more) for quick visual scanning. • Flexible filtering — Include or exclude specific event types to focus on what matters. Filter out noisy GTM lifecycle events or isolate specific interactions. • Event grouping — Group related events by time window or trigger events to understand the sequence of dataLayer activity. • Event persistence — Optionally retain events across page refreshes, ideal for testing multi-step funnels and form submissions. • Multiple dataLayer support — Monitor custom dataLayer array names alongside the standard dataLayer. • Data export — Export captured events as JSON for documentation, debugging, or sharing with colleagues. • Per-domain configuration — Save different settings for different websites. Who is this for? • Google Tag Manager developers validating implementations • Analytics engineers debugging tracking issues • QA teams verifying analytics requirements • Digital marketers auditing tag firing behaviour • Developers integrating analytics into web applications Privacy DataLayer Lens operates entirely within your browser. No data is collected, transmitted, or stored externally. All captured events remain local to your machine.