React useLocalStorage Hook: SSR-Safe Persistent State (2026)

Short summary

A practical tutorial on building a production-grade useLocalStorage hook for React that handles SSR safety, corrupted data, cross-tab synchronization, and multi-component consistency. The hook mirrors useState's API but adds automatic serialization for objects, numbers, Sets, Maps, and Dates. The article walks through four common bugs in naive implementations and how the @reactuses/core hook solves each one.

• •Covers four bugs in naive localStorage hooks: SSR crashes, bad data, cross-tab desync, and multi-component drift
• •Demonstrates @reactuses/core useLocalStorage API with automatic type-aware serialization
• •Includes SSR-safe patterns, functional updates, and null handling for removed keys

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