Here's Why and How to Use It

We've all been there. You're building a web app, everything works fine in one tab — but the moment a user opens a second tab, things start breaking. Cart items disappear. Login state gets out of sync. Background tasks run twice.

I ran into this problem one too many times, so I built tabcoord to solve it properly.

What is tabcoord?

tabcoord is a small library (under 5KB, zero dependencies) that keeps your browser tabs in sync. It gives you shared state, leader election, locks, and an event bus — all working across tabs automatically.