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PeerJS: Simple peer-to-peer with WebRTC

https://t.me/joinchat/VWI0UBxnG7f7_DV7

PeerJS provides a complete, configurable, and easy-to-use peer-to-peer API built on top of WebRTC, supporting both data channels and media streams.

Live Example

Here's an example application that uses both media and data connections: https://glitch.com/~peerjs-video. The example also uses its own PeerServer.

Setup

Include the library

with npm: npm install peerjs

with yarn: yarn add peerjs

// The usage -
import { Peer } from "peerjs";

Create a Peer

const peer = new Peer("pick-an-id");
// You can pick your own id or omit the id if you want to get a random one from the server.

Data connections

Connect

const conn = peer.connect("another-peers-id");
conn.on("open", () => {
	conn.send("hi!");
});

Receive

peer.on("connection", (conn) => {
	conn.on("data", (data) => {
		// Will print 'hi!'
		console.log(data);
	});
	conn.on("open", () => {
		conn.send("hello!");
	});
});

Media calls

Call

navigator.mediaDevices.getUserMedia(
	{ video: true, audio: true },
	(stream) => {
		const call = peer.call("another-peers-id", stream);
		call.on("stream", (remoteStream) => {
			// Show stream in some <video> element.
		});
	},
	(err) => {
		console.error("Failed to get local stream", err);
	},
);

Answer

peer.on("call", (call) => {
	navigator.mediaDevices.getUserMedia(
		{ video: true, audio: true },
		(stream) => {
			call.answer(stream); // Answer the call with an A/V stream.
			call.on("stream", (remoteStream) => {
				// Show stream in some <video> element.
			});
		},
		(err) => {
			console.error("Failed to get local stream", err);
		},
	);
});

Running tests

npm test

Browsers support

Firefox	Chrome	Safari
last 4 versions	last 4 versions	12.1+

Safari

Safari supports only string data when sending via DataConnection. Use JSON serialization type if you want to communicate with Safari. By default, DataConnection uses Binary serialization type.

FAQ

Q. I have a message Critical dependency: the request of a dependency is an expression in browser's console

A. The message occurs when you use PeerJS with Webpack. It is not critical! It relates to Parcel https://github.com/parcel-bundler/parcel/issues/2883 We'll resolve it when updated to Parcel V2.