Building Enterprise WebRTC Video Conferencing with NestJS & Next.js

WebRTC Architecture Overview

WebRTC enables real-time peer-to-peer communication directly in browsers without plugins. The architecture involves three key components: Signaling Server, STUN Server, and TURN Server.

Signaling Server with NestJS WebSockets

@WebSocketGateway({ cors: { origin: '*' } })
export class RtcGateway {
  @WebSocketServer() server: Server;
  @SubscribeMessage('offer')
  handleOffer(@MessageBody() data: any, @ConnectedSocket() client: Socket) {
    client.to(data.room).emit('offer', data.sdp);
  }
}

ICE Candidate Exchange

ICE candidates are network paths that peers can use to connect. Exchange them through your signaling server efficiently.

STUN/TURN Configuration

For production, use Coturn as your TURN server to handle symmetric NAT traversal.

Screen Sharing

Use getDisplayMedia() API for screen capture and replace the video track in the existing peer connection.