openrtc-netcode

openrtc-netcode is a small multiplayer layer on top of OpenRTC. It treats OpenRTC rooms as lobbies, forms a deterministic P2P mesh between lobby members, and exposes reliable typed messages, lightweight replicated state, networked objects, and browser voice-chat signaling.

Gameplay payloads are sent over OpenRTC peer data paths only: Iroh relay/direct, WebRTC DataChannel upgrades, and MoQ routes when enabled. Firebase and Firestore remain part of OpenRTC's control plane for identity, discovery, rooms, tickets, and browser signaling metadata; openrtc-netcode does not use Firestore as a state or message relay.

import { createNetcode } from 'openrtc-netcode';

const netcode = createNetcode({ apiKey: 'pk_live_...' });
await netcode.createLobby({ id: 'duel-room' });

netcode.onMessage('chat', (message) => {
  console.log(message.from, message.payload);
});

await netcode.broadcast('chat', { text: 'hello' });

Networked game objects are synchronized through netcode.objects:

await netcode.objects.spawn({
  id: 'crate-1',
  kind: 'crate',
  transform: { position: { x: 0, y: 1, z: 0 } },
  physics: { linearVelocity: { x: 0, y: 0, z: 0 } },
});

Voice chat uses OpenRTC netcode connections for SDP/ICE signaling and lets the browser WebRTC stack carry microphone media:

await netcode.voice.start();
netcode.voice.on('peer:stream', ({ stream }) => {
  audioElement.srcObject = stream;
});