Socket.io Has a Free Real-Time Engine — Bidirectional Events Between Client and Server

Socket.io Has a Free Real-Time Engine for Client-Server Communication REST APIs are request-response. Sometimes you need the server to push data to clients instantly. Socket.io has been solving this for 14 years and it is still the go-to. What Socket.io Does Socket.io provides bidirectional, event-based communication: WebSocket + fallbacks — automatically falls back to polling if WebSocket fails Rooms and namespaces — organize connections logically Broadcasting — send to all, some, or specific clients Auto-reconnection — handles disconnects gracefully Binary support — send files and buffers natively Multiplexing — multiple namespaces on one connection Quick Start // Server import { Server } from " socket.io " ; const io = new Server ( 3000 , { cors : { origin : " * " } }); io . on ( " connection " , ( socket ) => { console . log ( " User connected: " , socket . id ); socket . on ( " chat:message " , ( msg ) => { io . emit ( " chat:message " , { user : socket . id , text : msg }); }); s