MarTech Debugger by House of MarTech

See every tag, pixel & CDP call your site sends: GA4, Meta, Segment, Tealium & more. Decode every event, live in DevTools.

Do you actually know what your website is sending to your marketing stack? Most of the time, nobody does. The data goes out, everything looks fine, and the problems only surface weeks later when a campaign misfires or a report looks off. MarTech Debugger shows you exactly what every event contains, the moment it is sent, and flags the problems that quietly corrupt customer data. Open DevTools, click the MarTech Debugger panel, and read your tracking in plain terms as it happens. CDPs decoded in depth: - Treasure Data (td-js-sdk) - Segment (analytics.js) - Tealium (Collect / utag) - Lytics (jstag) - Zeotap (Collect / zeotap.js) Beyond the CDPs, the extension recognizes more than 50 vendors across analytics, advertising, tag management, and consent, and includes a dataLayer inspector for the common data layer formats (GTM, Tealium, Adobe, and W3C). The Debugger decodes every tracking event live as you browse, event name, payload, envelope. Flags real problems automatically: - Duplicate events (double-tracking) - Missing user identity (events that can’t be stitched to a profile) - Empty or “undefined” values - Failed requests, with the likely cause in plain words: a hit that answered 403, an event a vendor refused, a pixel an ad blocker stopped before it left the browser - Filter by category (CDP, analytics, advertising, tag managers, consent), show failed requests only, search across events, keys and values - Inspect the full JSON payload as a collapsible tree with syntax highlighting, plus request and response headers and the response body when you need them - Copy any event as JSON or as a cURL command - Export the filtered session as JSON or CSV, named after the site and timestamp - Credentials (API keys, write keys, cookies) masked by default Everything happens locally, inside your own DevTools. Your events stay on your machine, and the extension runs with zero permissions. Who it’s for: Marketers, MarTech and analytics teams, consultants, and QA: anyone who needs to trust what their site is sending to its marketing stack, and to catch problems before they reach production. Built by House of MarTech, houseofmartech.com