Dev tutorial: Build a React hook to sync state across browser tabs natively

A developer tutorial published on DEV Community walks through building a custom React hook called useSyncedState that keeps application state consistent across multiple browser tabs. The solution uses two built-in browser APIs — BroadcastChannel for instant state fan-out and navigator.locks for exclusive write coordination — without requiring any third-party libraries. Each tab registers a shared channel listener and acquires a mutex lock before writing, preventing race conditions and split-brain mutations. The hook also tags outgoing messages with a unique session ID to avoid echo loops, and includes fallback logic for environments where these APIs are unavailable, such as server-side rendering. The author shares the full implementation on GitHub alongside real-world use cases for multi-tab dashboards and collaborative interfaces.