GUN (also known as Graph Universe Node, gun.js, and gunDB) is an open source, offline-first, real-time, decentralized, graph database written in JavaScript for the web browser.

The database is implemented as a peer-to-peer network distributed across "Browser Peers" and "Runtime Peers". It employs multi-master replication with a custom commutative replicated data type (CRDT).[citation needed]

GUN is currently used in the decentralized version of the Internet Archive.

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