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libp2p/go-libp2p

★ 6,802GoAudience · developerComplexity · 4/5LicenseSetup · moderate

TLDR

A Go library providing ready-made building blocks for peer-to-peer applications, handling how computers find each other, connect securely, and send messages without routing through a central server.

Mindmap

mindmap
  root((go-libp2p))
    What it does
      Peer discovery
      Secure connections
      Modular protocols
    Tech Stack
      Go
    Use Cases
      Decentralized apps
      Blockchain nodes
      P2P messaging
    Notable users
      IPFS Kubo
      Ethereum Prysm
      Filecoin Lotus
    Audience
      Go developers
      Blockchain engineers
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Code map

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Things people build with this

USE CASE 1

Build a decentralized application where users connect directly to each other without a central server

USE CASE 2

Add peer discovery and encrypted connections to a blockchain node or distributed storage system

USE CASE 3

Implement a peer-to-peer messaging protocol using modular networking components without reinventing low-level infrastructure

USE CASE 4

Run a Go node that connects to the IPFS or Ethereum network using the same underlying library those projects use

Tech stack

Go

Getting it running

Difficulty · moderate Time to first run · 30min

Pure Go import with no system dependencies, but peer-to-peer networking concepts have a steep learning curve.

Use freely for any purpose, including commercial use, as long as you include the original MIT copyright notice.

In plain English

libp2p is a networking toolkit for building peer-to-peer applications, where computers talk directly to each other rather than routing everything through a central server. This repository is the Go language implementation of that toolkit. It grew out of IPFS, a decentralized file storage project, but was separated into its own library so other projects could use it independently. The core idea is that peer-to-peer software has historically required developers to rebuild the same low-level networking infrastructure from scratch for every project: how to find other computers on the network, how to establish a secure connection, how to send messages reliably. libp2p provides those building blocks as a modular set of components, so developers can pick the pieces they need without having to rewrite them. Projects using this library span several areas of decentralized infrastructure. Listed notable users include Kubo (the main Go implementation of IPFS), Lotus (a Filecoin protocol implementation), Prysm (an Ethereum consensus client), and various other blockchain and messaging systems. This gives a sense of the kind of applications it targets: distributed storage networks, blockchains, and applications that need to work without a central service coordinating connections. Using it in a Go project means adding an import and calling a constructor to create a libp2p host, which is then the entry point for establishing connections and running protocols on top of them. Examples are available in the repository's examples folder. The project is maintained by Protocol Labs and is MIT-licensed. It follows a contribution process through GitHub issues and pull requests, and maintainers ask that any use of AI assistance be disclosed when submitting a pull request.

Copy-paste prompts

Prompt 1
Using go-libp2p, show me how to create a basic peer host that can discover and connect to other peers on a local network.
Prompt 2
Help me implement a simple chat application using go-libp2p where two nodes connect directly and exchange messages without a relay server.
Prompt 3
I'm building a blockchain node in Go. Show me how to use go-libp2p to handle peer discovery and secure connections the way Prysm uses it.
Prompt 4
Walk me through the go-libp2p examples folder and explain what each example demonstrates for building peer-to-peer applications.
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