libp2p/rust-libp2p
Rust Libp2p
rust-libp2p is a modular peer-to-peer networking library written in Rust, implementing the libp2p specification. It provides a composable stack of transport, security, and discovery protocols that can be mixed and matched to build decentralized applications, with a central swarm manager coordinating all active connections, protocol negotiation, and peer lifecycle.
The library distinguishes itself through a pluggable transport abstraction that supports TCP, QUIC, WebSocket, WebRTC, and WebTransport, enabling cross-platform operation across browsers, mobile devices, and servers. It secures every connection by default using Noise-based authenticated encryption or TLS 1.3, and provides decentralized peer discovery through Kademlia DHT, mDNS, and rendezvous points without central coordination. NAT traversal and circuit relay connectivity allow peers behind firewalls and routers to establish direct connections, while UPnP automatic port mapping makes peers reachable from the internet.
The stack includes GossipSub mesh propagation for scalable publish-subscribe messaging, multiplexed stream muxing for running multiple logical substreams over a single transport connection, and multiaddress network addressing for identifying peers and their locations. It supports custom protocol implementation on top of the swarm, request-response messaging, peer ping for connectivity checks, and metrics export in OpenMetrics format. The library also enables browser-to-browser P2P connections, light client node operation, and resource-constrained device deployment.
