index.js

const express = require('express');
const app= express();
const cors = require('cors')
const mongoose = require('mongoose')
const bodyParser = require('body-parser')
app.use(bodyParser.urlencoded({extended:true,limit:'50mb'}))
app.use(bodyParser.json({limit:'50mb'}));
app.use(cors({origin:'*'}))
require('dotenv').config()
const patientRouter = require('./routes/patient.route')
const staffRouter = require('./routes/staff.route');
const chatRouter = require('./routes/chat.route');
app.use('/patient',patientRouter);
app.use("/staff", staffRouter);
app.use("/chat", chatRouter);
let PORT= process.env.PORT
const URI = process.env.URI;
const cloudinary = require('cloudinary');



cloudinary.config({ 
    cloud_name: process.env.CLOUD_NAME, 
    api_key: process.env.API_KEY, 
    api_secret: process.env.API_SECRET
});




app.get('/',(req,res)=>{
    res.send('Hospital Management Server Initialized')
})


mongoose.connect(URI,(err)=>{
if(err){
  console.log(err)
	console.log('Error in Connection to MongoDB')
}else{
	console.log("I'm now connected to Mongoose Database")
}
})

const connection = app.listen(PORT,()=>{
	console.log('Hospital Management Server listening on Port 4000');
})

const io = require("socket.io")(connection, {cors: {options: "*"}});

io.on("connection", (socket) => {
  console.log(`${socket.id} is online`);
  socket.on('get-message', message => {
    console.log(message);
    io.emit('new-message', message);
  })
  socket.on("disconnect", () => {
    console.log(`${socket.id} is offline`)
  })
});