fec-browser-storage

The best way to implement client-side storage is enforcing uniform key prefixes, JSON serialization, expiration cleanup, and capacity fallbacks. This ensures data security and maintainability across localStorage, sessionStorage, IndexedDB, and cookies.

Use IndexedDB instead of localStorage when handling large offline caches or complex data structures. IndexedDB provides asynchronous, high-capacity storage, while localStorage suits smaller user preferences requiring synchronous access and simple JSON serialization.

Prevent data leakage in browser storage by applying security considerations tailored to authentication state. Use cookies with appropriate flags for sensitive tokens and enforce strict cleanup rules to avoid persistent exposure across sessions.

Limitations of localStorage include synchronous blocking, strict capacity limits, and lack of cross-tab isolation. For robust cross-browser compatibility and larger offline data, transition to IndexedDB and implement capacity fallbacks to handle quota exceeded errors.