webrtc simple example

client.js

(async () => {
  if (!("mediaDevices" in navigator) || !("RTCPeerConnection" in window)) {
    alert("Sorry, your browser does not support WebRTC.");
    return;
  }
  const stream = await navigator.mediaDevices.getUserMedia({video:true, audio:true});
  yourVideo.srcObject = stream;

  const configuration = {
    iceServers: [{urls: "stun:stun.1.google.com:19302"}]
  };
  const yours = new RTCPeerConnection(configuration);
  const theirs = new RTCPeerConnection(configuration);

  for (const track of stream.getTracks()) {
    yours.addTrack(track, stream);
  }
  theirs.ontrack = e => theirVideo.srcObject = e.streams[0];

  yours.onicecandidate = e => theirs.addIceCandidate(e.candidate);
  theirs.onicecandidate = e => yours.addIceCandidate(e.candidate);

  const offer = await yours.createOffer();
  await yours.setLocalDescription(offer);
  await theirs.setRemoteDescription(offer);

  const answer = await theirs.createAnswer();
  await theirs.setLocalDescription(answer);
  await yours.setRemoteDescription(answer);
})();