How to Build a Self-Hosted Video Watch-Time Heatmap Without Analytics Vendors

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A developer tutorial published on DEV Community walks through building a video watch-time heatmap entirely from scratch, without third-party analytics tools or SDKs. The system uses a client-side interval tracker of around 80 lines of JavaScript, a beacon endpoint, and a canvas renderer to visualise which parts of a video viewers actually watch. Rather than logging playback events, the approach tracks media-time segments — open and close spans — to accurately capture rewatches, skips, and drop-off points. Data is stored server-side using SQLite, with one row per video-second, keeping all analytics under the developer's own control. The guide notes that similar heatmap features are sold as premium offerings by hosted video platforms, but the underlying mechanics are straightforward to implement independently.

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