libp2p: A Modular Peer-to-Peer Networking Stack for Any Language

Why libp2p exists: extracting the networking layer from IPFS

libp2p grew out of IPFS. When the IPFS project needed a peer-to-peer networking layer, the team built one and then extracted it as an independent project so any application could use it. The README describes it as the product of a long and arduous quest into the internet's network stack and twenty years of peer-to-peer protocols, with the goal of making it possible to build large-scale P2P systems without solving the same low-level networking problems from scratch on each project.

The meta-repository at libp2p/libp2p on GitHub is not an implementation. It is the community hub: it holds the specs link, the list of implementations, security reporting procedures, and community meeting details. There is no installable package here. The repository's top-level structure reflects that: .github/, img/, logo/, a LICENSE file, a README, and a funding.json. Everything runnable is in one of the implementation repositories listed in the README.

The protocol suite: what libp2p provides and what it leaves to you

libp2p is described in the README as a protocol suite that cleanly separates concerns. It addresses transport (how bytes move between peers), peer discovery (how peers find each other), stream multiplexing (how multiple logical streams share a single connection), and connection security. Separating these layers means an application can swap transports (TCP, QUIC, WebRTC) or discovery mechanisms (mDNS, DHT, bootstrap lists) without rewriting the rest of the stack.

The README uses the phrase 'network stack' to describe it, which is accurate at the abstraction level. libp2p handles the plumbing between peers. It does not define what your application does with those connections. A chat application, a blockchain node, a distributed file system, and a gaming network can all use libp2p for the same connectivity layer while implementing entirely different application protocols on top.

The formal specifications live at github.com/libp2p/specs. Those specs define each protocol in implementation-agnostic terms so that a Go node and a Rust node can interoperate because they both implement the same spec, not because they share code.

Active implementations across twelve languages

The README lists twelve active libp2p implementations:

go-libp2p is for Go services. js-libp2p runs in Node.js and in browsers. rust-libp2p supports WebAssembly in addition to native targets. py-libp2p is the Python implementation. cpp-libp2p is the C++ version. swift-libp2p targets Apple platforms. nim-libp2p is maintained by the Vac team. jvm-libp2p covers Java and Kotlin on the JVM. The zig-libp2p at zen-eth is the current Zig implementation. dotnet-libp2p is maintained by Nethermind and covers .NET. c-libp2p by Pier-Two is the C implementation. litep2p by Parity Technologies is an alternative Rust implementation.

The README also lists two dormant implementations that the community would welcome volunteers to revive: erlang-libp2p (originally built for the Helium network) and the original zig-libp2p (now unmaintained, superseded by the zen-eth implementation).

This breadth has a practical implication: if your project uses multiple languages, different components can use language-appropriate libp2p implementations and still communicate, because they all implement the same specifications. That interoperability only holds for the protocols that a given implementation actually covers, however, and coverage varies across implementations.

Security reporting and the community structure

Security vulnerabilities should be reported to [email protected] rather than as GitHub issues. The README documents what to include: reproduction steps, which implementations are affected (named by their repository, such as go-libp2p or js-libp2p), expected versus observed behavior, and the observed impact at the network or application level. The details are in the security reporting discussion at github.com/libp2p/libp2p/discussions/274.

The community is distributed across several platforms. libp2p has channels on Filecoin Project Slack (#libp2p-community, #libp2p-implementers, #libp2p-docs), a Discord server, a Telegram group, and Matrix rooms. Community-wide discussions happen at discuss.libp2p.io. Each implementation also has its own GitHub Discussions forum for technical questions specific to that language.

The project runs regular community meetings, tracked through a calendar on Lu.ma with an iCal feed. The calendar and a blog at blog.libp2p.io provide announcements and updates. A community blog post submission path exists through the libp2p/libp2p discussion forum or discuss.libp2p.io.

The last push to this meta-repository was on 2026-05-14.

Where libp2p is not the right fit

libp2p is a protocol suite, not an application framework. Teams who need ready-made chat, file sharing, or streaming applications will not find that in libp2p. What they will find is the transport and discovery infrastructure that such applications build on.

The breadth of implementations is an advantage for interoperability, but it also means that not every implementation supports every libp2p protocol. A team choosing py-libp2p for a Python service should verify which protocols that implementation covers before relying on them in production. The README notes that py-libp2p's technical questions go to its own GitHub Discussions forum, and the implementation-level documentation varies by language.

For teams that need a simple request/response API over the network without the full peer-to-peer discovery and routing machinery, libp2p adds more complexity than the problem requires. gRPC or plain HTTP services are far simpler for client-server architectures where one side already knows the address of the other.

libp2p versus devp2p: scope and portability

devp2p is the peer-to-peer networking layer developed for Ethereum client implementations. The two projects are often compared because they address a similar problem at a similar layer, but they differ in scope and portability.

devp2p is tightly coupled to the Ethereum ecosystem. Its protocols (including the RLPx transport and the Ethereum discovery protocol) were designed for Ethereum clients and carry Ethereum-specific assumptions. Building a non-Ethereum application on devp2p means accepting that coupling.

libp2p was designed from the start to be application-agnostic and language-agnostic. Its transports, discovery, and security protocols are specified independently of any application domain. IPFS, Filecoin, Polkadot, and other projects use libp2p for this reason: the same networking stack serves different application domains without inheriting domain-specific assumptions.

The trade-off is that libp2p's generality comes with more configuration. A devp2p-based Ethereum client uses a known-good, narrowly scoped configuration. A libp2p-based application must choose transports, discovery mechanisms, and security protocols from a menu, which gives more flexibility but requires more upfront design decisions.

Editorial conclusion

libp2p is the right foundation for engineers who need peer-to-peer connectivity that is not tied to a single language, transport, or application protocol. It is not the right choice for teams that want a pre-built application layer: libp2p provides the networking primitives, not the application logic. Before starting, choose the implementation that matches your runtime (go-libp2p for Go services, js-libp2p for Node.js or browser, rust-libp2p when WebAssembly is required), read the specs at github.com/libp2p/specs, and check that implementation against the spec for the specific protocols your application needs, because not all implementations cover all protocols.

Frequently asked questions

Official sources

1. Issues
2. libp2p/libp2p on GitHub
3. License: MIT
4. Project website
5. README