Removed callback

index.js

@@ -7,7 +7,7 @@ const httpServer = http.createServer(app);
 
 const PORT = process.env.PORT || 3000;
 
-const wsServer = new WebSocket.Server({ server: httpServer }, () => console.log(`WS server is listening at ws://localhost:${WS_PORT}`));
+const wsServer = new WebSocket.Server({ server: httpServer });
 
 // array of connected websocket clients
 let connectedClients = [];