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Dev.to
6/15/2026
I Built a Library to Sync Browser Tabs 🔄

I Built a Library to Sync Browser Tabs 🔄

Short summary

A developer created tabcoord, a 5KB library for synchronizing browser tab state with built-in persistence, leader election, and distributed locks. Unlike native BroadcastChannel, it adds automatic SSR support, seamless late-tab bootstrap, and older browser fallbacks. Essential for web apps where multiple tabs need tightly coordinated state without duplicate background processing or race conditions.

  • •5KB library that syncs state across browser tabs with built-in persistence, leader election, and lock management
  • •Handles SSR safety, late-joining tabs, and older browser support that native BroadcastChannel doesn't
  • •Prevents duplicate background tasks and race conditions in multi-tab web applications

Generated with AI, which can make mistakes.

#product-launch#open-source
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