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http server not responding to websocket

I am unable to have my http server respond to websocket requests. How do I correctly listen to these events? my server is running a SPA and I would like to try and use websockets to constantly send updated information from a file to the client. I have successfully done this with SSE but am curious about websockets.

My server.js has the following

const http = require('http');
const WebSocket = require('ws');

var server = http.createServer(function(request, response) 
 request.on('error', (err) => 
 console.error(err.stack);
 );
);

server.listen(8001);

const wss = new WebSocket.Server( server );

wss.on('connection', function connection(ws) 
 ws.on('message', function message(msg) 
 console.log(msg);
 );
 );
});

my client.js

var wsClient = ()=>
 const ws = new WebSocket('ws:'+serverip+'/WSindexJSON'); // this server is set through XHR request

 ws.onopen = function(e) 
 console.log("Connection established");
 ;

 ws.addEventListener('open', () => 
 // Send a message to the WebSocket server
 ws.send('Hello!');
 );
 console.log("ws open",ws)

 ws.addEventListener('message', event => 
 // The `event` object is a typical DOM event object, and the message data sent
 // by the server is stored in the `data` property
 console.log('Received:', event.data);
 );

I am able to see the client websocket created in the chrome developer network tools, but nothing is coming through on the server.
Do I need to create the websocket on the server side?

I have seen another example which the server listens for an upgrade event . I have tried that with no success.

server.on('upgrade', function upgrade(request, socket, head) 
 const pathname = url.parse(request.url).pathname;
 console.log('server upgrade event websocket', pathname)
 if (pathname === '/WSindexJSON') 
 wss.handleUpgrade(request, socket, head, function done(ws) 
 wss.emit('connection', ws, request);
 );
 else 
 socket.destroy();
 
 );

I have also tried another websocket module const WebSocketServer = require('websocket').server; and run into the same questions.

You need to specify port on which client will attempt to connect (in your case 8001):

var wsClient = ()=>{
 const ws = new WebSocket('ws:'+serverip+':8001/WSindexJSON');