WebSocket Implementation

Build scalable real-time communication systems with proper connection management.

Server Implementation (Socket.IO)

const { Server } = require('socket.io');
const { createAdapter } = require('@socket.io/redis-adapter');
const { createClient } = require('redis');

const io = new Server(server, {
  cors: { origin: process.env.CLIENT_URL, credentials: true }
});

// Redis adapter for horizontal scaling
const pubClient = createClient({ url: process.env.REDIS_URL });
const subClient = pubClient.duplicate();
Promise.all([pubClient.connect(), subClient.connect()]).then(() => {