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Я пытаюсь использовать сокет.ввод-вывод для добавления websockets на мой серверный сервер. Я получаю порт уже используется ошибка есть идеи?

Я создаю приложение react на интерфейсе, а мой сервер-nodejs. Я хотел бы иметь возможность использовать веб-сайты, чтобы иметь небольшую функцию чата в этом приложении

Вот бэкэнд Index.js

 const express = require('express'); const mongoose = require('mongoose'); const cookieSession = require('cookie-session'); const passport = require('passport'); const bodyParser = require('body-parser') const keys = require('./config/keys'); const cors = require('cors'); const socket = require('socket.io'); require("dotenv").config(); require('./models/GoogleUserModel'); // the user model must be placed before this services passport// this must be ran after requiring model bcuz this needs the model. ORDER require('./models/UserModel'); require('./models/FacebookUserModel'); require('./models/Contact'); require('./models/Template'); require('./models/UserProfile') require('./services/passport');  const app = express();  const corsOptions = {  origin:"http://localhost:3000",   credentials: true, //access-control-allow-credentials:true  optionSuccessStatus:200 } app.use(cors(corsOptions))  mongoose.Promise = global.Promise; mongoose.connect(keys.mongoURI, {  useNewUrlParser: true,  useCreateIndex: true,  useUnifiedTopology: true }) mongoose.connection.on('error', () =gt; {  throw new Error (`unable to connect to database: ${keys.mongoURI}`) });   app.use(bodyParser.json({limit: '10mb'})) app.use(express.urlencoded( { extended: true })) app.use(  cookieSession({  maxAge: 30 * 24 * 60 * 60 * 1000,  keys: [keys.cookieKey]  }) ) app.use(passport.initialize()); app.use(passport.session());  require('./routes/facebookAuthRoutes')(app); require('./routes/googleAuthRoutes')(app); require('./routes/localAuthRoutes')(app); //require('./routes/billingRoutes')(app); require('./routes/webhookRoutes')(app) require('./routes/userRoutes')(app); // we are passing in the route functions, THEN calling the functions with the app object  const io = socket(5000) // this is giving an error of port already in use? does socket need seperate server to run? const PORT = process.env.PORT || 5000;  app.listen(PORT);