Zero-Cookie Global Visitor Map Built with Cloudflare Edge and Supabase

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A developer describes building a public, real-time world map of site visitors on a static Next.js website without using cookies. The approach reads a visitor's country code from Cloudflare's edge trace endpoint and discards the raw IP address immediately, so no IP data is stored. Visit counts per country are aggregated through an atomic PostgreSQL function in Supabase, which prevents race conditions during traffic spikes. A localStorage check keyed to the current date limits each device to one logged visit per day, and a headless layout component records visits from search landing pages. The map itself is a compact SVG grid that animates updates live via Supabase Realtime.

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Benchmarking Node.js setTimeout at Scale: Memory, Lateness and Restart Risks

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

Germany's public energy register lists 9.7 million installations with operator contacts

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ProgrammingDEV Community ·

How to Calculate Topsoil Volume in Cubic Yards With a Simple Formula

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