PeerJS vs WebTorrent
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
A JavaScript library that lets browsers connect directly to each other for data and video/audio calls.
Open source · MIT
A torrent client for Node.js and the browser that can stream video while it downloads.
The short answer
Choose PeerJS if you need…
- Web developers adding real-time chat or file-style data exchange between browsers
- Developers building simple video or audio call features in a web app
- Teams who want a TypeScript-based WebRTC wrapper with a small API
- Prototypes that connect two browsers without building their own signaling layer
Choose WebTorrent if you need…
- Developers who want to add torrent downloading or streaming to a JavaScript web or Node.js app
- Web projects that need peer-to-peer file transfer without installing browser plugins
- Teams building in-browser video streaming from torrents
- Developers who want a pure JavaScript BitTorrent implementation with no native dependencies
Side-by-side
| PeerJS | WebTorrent | |
|---|---|---|
| Type | Library | Library |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 13.5k | 31.5k |
| Setup difficulty | Intermediate | Intermediate |
| How you get it | Install with a package manager | Install with a package manager |
| Main language | TypeScript | JavaScript |
| Last code update | 8 months ago | 5 days ago |
What each one is
PeerJS
PeerJS is a JavaScript library that wraps WebRTC, the browser technology for direct connections between users, in a simpler API. It lets web apps send data or start audio and video calls between peers identified by IDs. The README says it needs a PeerServer to help peers find each other, which is a separate project.
WebTorrent
WebTorrent is a BitTorrent client written entirely in JavaScript that runs in both Node.js and web browsers. It lets a program fetch files from torrents and expose them as streams, so video can start playing before the download finishes. In browsers it uses WebRTC so no plugins or extensions are needed, though browser peers can only connect to other WebTorrent-capable clients.
Best for
PeerJS
- Web developers adding real-time chat or file-style data exchange between browsers
- Developers building simple video or audio call features in a web app
- Teams who want a TypeScript-based WebRTC wrapper with a small API
- Prototypes that connect two browsers without building their own signaling layer
WebTorrent
- Developers who want to add torrent downloading or streaming to a JavaScript web or Node.js app
- Web projects that need peer-to-peer file transfer without installing browser plugins
- Teams building in-browser video streaming from torrents
- Developers who want a pure JavaScript BitTorrent implementation with no native dependencies
Strengths
PeerJS
- Small, focused API: create a peer, connect, send data, or call
- Tested against current Chrome, Edge, Firefox, and Safari versions per the README
- MIT licensed with a documentation site and changelog
WebTorrent
- Same npm package works in Node.js and the browser
- Pure JavaScript with no native dependencies, and the README says the test suite runs offline
- Supports streaming with seeking, fetching pieces on demand
Not ideal for
PeerJS
- People who need a finished app with no coding, since this is a library for developers
- Projects needing guaranteed connections across all networks, because the README does not describe NAT traversal or relay fallback
- Users needing support for very old browsers, since the README says only listed versions are officially supported
WebTorrent
- People who just want a ready-made torrent app to download files; the README points to WebTorrent Desktop for that and this repo is a library
- Users who need browser peers to talk to standard UDP/TCP-only torrent clients, since the README says browsers cannot reach those peers directly
- Projects needing a stable, fully documented API for production without reviewing the docs themselves, as the README only links to external API docs
Trade-offs
PeerJS
- Requires a PeerServer for peers to find each other; the README points to a separate project for it
- The README notes a Parcel-related console warning when used with Webpack, described as non-critical
- Browser support is limited to listed versions; others are unsupported
WebTorrent
- Browser peers can only connect to other WebTorrent/WebRTC clients, not standard torrent clients directly
- Webpack needs extra configuration unless you use the prebuilt bundle
- Latest release is listed without binaries, so use via npm or source
Getting started
PeerJS
Install with npm
npm install peerjsInstall with yarn
yarn add peerjsWebTorrent
Install the library from npm
npm install webtorrentInstall the command line program globally
npm install webtorrent-cli -gFrequently asked questions
What is the difference between PeerJS and WebTorrent?
PeerJS: A JavaScript library that lets browsers connect directly to each other for data and video/audio calls. WebTorrent: A torrent client for Node.js and the browser that can stream video while it downloads. PeerJS suits web developers adding real-time chat or file-style data exchange between browsers, while WebTorrent suits developers who want to add torrent downloading or streaming to a javascript web or node.js app.
Are PeerJS and WebTorrent free?
PeerJS: Free and open source. WebTorrent: Free and open source.
Is PeerJS or WebTorrent more popular?
WebTorrent has more GitHub stars (31.5k) than PeerJS (13.5k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to PeerJS and WebTorrent?
Other options people compare them with include Socket.IO, Simplefolio, WebTorrent Desktop, DPlayer.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.