Node.js WebSockets in Production: Socket.IO vs ws, Scaling, and Reconnection Strategies

Node.js WebSockets in Production: Socket.IO vs ws, Scaling, and Reconnection Strategies WebSockets break the HTTP request-response model. Once you open a WebSocket connection, the server can push data to the client at any time — no polling, no long-polling hacks. That's the power. The production complexity is everything that comes after: handling dropped connections gracefully, scaling across multiple server instances, managing backpressure, and keeping connections alive without leaking memory. This guide covers the two dominant Node.js WebSocket libraries — socket.io and ws — how to choose between them, and the production patterns that prevent 3am pages. Socket.IO vs ws: When to Use Which Both libraries are mature, widely used, and actively maintained. But they solve different problems. ws — The Lean Choice ws is a spec-compliant, no-frills WebSocket implementation. It does exactly what WebSocket RFC 6455 defines and nothing else. npm install ws // server.js import { WebSocketServer }