IndexedDB

Summary

A low-level, transactional browser database for storing large amounts of structured data client-side — far more capable than localStorage for complex offline data.

• 1Store a small structured dataset in IndexedDB using the raw API or a wrapper like `idb`.
• 2Compare its capabilities (indexes, transactions, large storage) to localStorage.
• 3Learn it's the storage layer most offline-first apps and PWAs rely on.