digitalData
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dataslayer monitors the data layers used by Google Tag Manager, Tealium, Adobe DTM / Launch, and TagCommander to immediately update you when a new value is pushed. It also monitors some of the most popular analytics tags (Google Analytics App + Web / Universal / classic, Floodlight, and Adobe Analytics) for a single-panel debugging solution.
dataslayer is trusted by over 50,000 users with a 5 star review on the Chrome Web Store.