socket io simplified server

index.js

const { Server } = require("socket.io");

const io = new Server({ /* options */ });

io.on("connection", (socket) => {
 console.log(`user connected:`,socket.id);  
 
 socket.on("msg",(arg1) => {
    console.log(arg1);
     
    socket.broadcast.emit("response",arg1);
 });
});

io.on("hello", (arg1) => {
  console.log(arg1); // prints "world"
});

io.listen(3000);

console.log("started");