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

Browser support

| Firefox | Chrome | Edge | Safari | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 80+ | 83+ | 83+ | 15+ |

We test PeerJS against these versions of Chrome, Edge, Firefox, and Safari with BrowserStack to ensure compatibility. It may work in other and older browsers, but we don't officially support them. Changes to browser support will be a breaking change going forward.

[!NOTE]
Firefox 102+ is required for CBOR / MessagePack support.