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The Indexed Database API, or IndexedDB is a web browser standard interface for a transactional local database of JSON objects collections with indices. Websites can collect and save permanent data in a database
IndexedDB is one of the storage capabilities introduced into browsers over the years. It’s a key / value store (a noSQL database) considered to be the definitive solution for storing data in browsers.
It’s an asynchronous API, which means that performing costly operations won’t block the UI thread providing a sloppy experience to users. It can store an indefinite amount of data, although once over a certain threshold the user is prompted to give the site higher limits.
It’s supported on all modern browsers.
It supports transactions, versioning and gives good performance.
IndexedDB can be used for browser implemented functions, such as bookmarks
IndexedDB is a transactional database embedded in the browser. The database is organized around the concept of collections of JSON objects similarly to NoSQL databases MongoDB or CouchDB. Each object is identified with a key generated during insert. An indexing system optimizes access to stored objects