my final update except its nothing

websocket.js

@@ -1,16 +1,15 @@
 import { appendFile } from 'fs/promises';
 import WebSocket, { WebSocketServer } from "ws";
 const wss = new WebSocketServer({ noServer: true });
-let dataFile = "data/online.txt";
 
 
 wss.on("connection", function connection(ws, req, res) {
 	ws.send(`online=${wss.clients.size}`);
-	setInterval(() => {
+	const onlineInterval = setInterval(() => {
 		ws.send(`online=${wss.clients.size}`);
 	}, 10000);
 
-	ws.killTimer = setTimeout(() => {
+	const killTimer = setTimeout(() => {
 		ws.close();
 	}, 1000 * 60 * 60 * 12);
 	
@@ -24,7 +23,10 @@ wss.on("connection", function connection(ws, req, res) {
 		}
 	});
 
-	ws.on("close", () => {clearTimeout(ws.killTimer)});
+	ws.on("close", () => {
+		clearTimeout(killTimer);
+		clearInterval(onlineInterval)
+	});
 });
 let port = 7910;
 import express from "express";