persistNSync

Zustand middleware for persisting and syncing state across browser tabs, windows, and iframes (same origin). Current stable version is 1.2.3, released regularly with a focus on reliability. It uses the Broadcast Channel API for instant cross-tab synchronization and localStorage (or sessionStorage/cookies) for persistence. Differentiators include sub-1kB size, full TypeScript support, fire-and-forget state updates optimized for single-user systems, and exclude/include filters for selective syncing. Alternatives like zustand's built-in persist middleware lack cross-tab sync out of the box.