IndexedDB: The Browser's Structured Database — CRUD, Indexes, and Transactions
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IndexedDB is the browser's built-in database — it can store gigabytes of structured data, works offline, and supports transactions. It's more powerful than localStorage but more complex. This guide covers the essentials: creating a database, CRUD operations, indexes, and a modern wrapper pattern. Why IndexedDB? Feature localStorage sessionStorage IndexedDB Capacity ~5MB ~5MB Hundreds of MB+ Data types Strings only Strings only Any structured-clone-able value Async No (bloc