WebSocket — Real-Time Communication

Architecture Intermediate

WebSocket — Real-Time Communication¶

WebSocketReal-timeSocket.io 3 min read

WebSocket server implementation for chat, notifications and live dashboards. Scaling with Redis.

When to Use WebSocket?¶

Bidirectional, persistent channel. The server can push data to the client. Use cases: chat, notifications, real-time dashboards.

Socket.io Example¶

// Server
const io = new Server(3000, { cors: { origin: '*' } });
io.on('connection', (socket) => {
    socket.on('join-room', (room) => socket.join(room));
    socket.on('message', (data) => {
        io.to(data.room).emit('message', {
            from: socket.id, text: data.text, ts: Date.now()
        });
    });
});
// Scaling: Redis adapter
const { createAdapter } = require('@socket.io/redis-adapter');
io.adapter(createAdapter(pubClient, subClient));

Summary¶

Socket.io simplifies implementation. For scaling, add a Redis adapter and sticky sessions.

Need Help with Implementation?¶

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