Advanced CommunicationLesson 72Free preview

Socket.IO

This lesson is part of Node.js · All levels

Summary

This lesson discusses Socket.IO, a WebSocket-based real-time two-way communication library for Node.js applications. You'll create a server with http.createServer and then install Socket.IO, and use the emitter and on to exchange events between the server and the client. Deals with fallback transport and disconnect handling.

Key points

Install socket.io (server) and socket.io-client (customer) through npm.
The server: new Server(httpServer) and then io.on('connection', socket =>...).
Socket.emit sends events to one client; io.emit sends to all connected clients.
Events can carry a JSON payload in the form of objects or arrays.
The socket.join(room) and io.to(room) support multiplayer chat rooms.

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