Socket.io Has a Free Real-Time API That Handles Millions of Connections

Socket.IO provides real-time bidirectional communication with automatic reconnection, room management, and binary streaming — all with a clean API. Server Setup npm install socket.io import { Server } from ' socket.io ' ; const io = new Server ( 3000 , { cors : { origin : ' * ' } }); io . on ( ' connection ' , ( socket ) => { console . log ( `Connected: ${ socket . id } ` ); socket . on ( ' chat:message ' , ( data ) => { // Broadcast to everyone in the room io . to ( data . room ). emit ( ' chat:message ' , { user : data . user , text : data . text , timestamp : Date . now () }); }); socket . on ( ' join:room ' , ( room ) => { socket . join ( room ); socket . to ( room ). emit ( ' user:joined ' , socket . id ); }); socket . on ( ' disconnect ' , () => { console . log ( `Disconnected: ${ socket . id } ` ); }); }); Client import { io } from ' socket.io-client ' ; const socket = io ( ' http://localhost:3000 ' ); socket . emit ( ' join:room ' , ' general ' ); socket . emit ( ' chat:message