IndexedDB

IndexedDB is a web standard API that lets web applications store large amounts of structured data inside the browser.

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IndexedDB is a browser database API standardized by the W3C and supported by all major web browsers. It stores objects by key and supports lookups through indexes, holding far more structured data and files than localStorage, which handles only strings.

Its operations are asynchronous and grouped into transactions. Web apps use it to cache data received from servers in the browser and to keep working without an internet connection.

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Idle background tabs cloned the same cache snapshot into IndexedDB, the browser's built-in database, twice a minute on the main thread.


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