index.js

const http=require("http");
const express =require("express");
const cors = require("cors");
const socketIO = require("socket.io");

const app=express();
const port = process.env.PORT || 4502 ;


const users=[{}];

app.use(cors());
app.get("/",(req,res)=>{
    res.send("Hell ITS WORKING")
})
const server=http.createServer(app);

const io=socketIO(server);


io.on("connection",(socket)=>{
    console.log('New Connection');

    socket.on('joined',({user})=>{
        users[socket.id]=user;
        console.log(`${user} has joined `);
        socket.broadcast.emit('userJoined',{user:"Admin",message:` ${users[socket.id]} has joined`});
        socket.emit('welcome',{user:"Admin",message:`Welcome to the chat ,${users[socket.id]} has joined`})
    })

    socket.on('message',({message,id})=>{
        io.emit('sendMessage',{user:users[id],message,id});

    })

    socket.on('disconnect',()=>{
            socket.broadcast.emit('leave',{user:"Admin",message:`${users[socket.id]} has left`});
        console.log(`user left`);
    })

    
    
})

server.listen(port,()=>{
    console.log(`server is working on http://localhost:${port}`);

})