unable to connect to nodejs server from react client with SocketIO

I’m learning socketIO and I set up and running a basic nodejs server . My problem is that when I try to connect to the server with my nextJS app nothing happens. No errors occur and the messages I want to be printed on connection do not appear .

My code :

server.js in backend folder

const express = require('express');
const app = express();
const server = require('http').Server(app);
const { v4: uuidV4 } = require('uuid');
const cors = require('cors');

const io = require('socket.io')(server, {
  cors: true,
  origins:["http://localhost:3000"]
});



app.use(cors());
app.options('*', cors());



io.on('connection', socket => {
  socket.on('test',()=>{
   console.log(' i am a test') //does not appear 
  })
  
})





   //I ALSO TRIED 
   //io.on('test',()=>{
       //console.log('I am a test');
     //})


server.listen(5000);

Then in my nextJS app in my frontend folder in index.js

import {useEffect} from 'react';
import io from 'socket.io-client';

const ENDPOINT = "http://localhost:5000";
const socket = io.connect(ENDPOINT);

  export default function Home() {

    useEffect(()=>{

     socket.emit('test');
    },[]);
    
   ...rest of code 
   
 }

So in my frontend app I emit the ‘test’ event to the server and the server did not console.log the response on connection

I would appreciate your help as I am new to socketIO