👀 Views: 37 💬 Answers: 1 📅 Created: 2025-06-11

node.js websockets express performance JavaScript

I recently switched to I've been struggling with this for a few days now and could really use some help. I'm sure I'm missing something obvious here, but I'm running a Node.js Express application that uses WebSockets for real-time updates to clients. Everything works fine under light load, but when I simulate a higher load (10+ concurrent WebSocket connections), I’m experiencing frequent disconnections with the behavior message `WebSocket connection to 'ws://localhost:3000/' failed: behavior during WebSocket handshake: Unexpected response code: 400`. I'm utilizing the `ws` library for WebSocket support and have the following setup: ```javascript const express = require('express'); const http = require('http'); const WebSocket = require('ws'); const app = express(); const server = http.createServer(app); const wss = new WebSocket.Server({ server }); app.get('/', (req, res) => { res.send('WebSocket server running'); }); wss.on('connection', (ws) => { console.log('Client connected'); ws.on('message', (message) => { console.log(`Received: ${message}`); ws.send(`Echo: ${message}`); }); }); server.listen(3000, () => { console.log('Server listening on port 3000'); }); ``` I have tried increasing the maximum payload size and added behavior handling to log more details, but the scenario continues. I also verified that the WebSocket handshake is not blocked by any middleware. I’m using Node.js version 16.13.0 and `ws` version 8.5.0. What could be the reason behind these disconnections under higher load, and how can I resolve this scenario? Are there any specific configurations or best practices I should follow for handling multiple WebSocket connections efficiently? Is there a better approach? What's the best practice here? I'm working in a Ubuntu 22.04 environment. Is there a simpler solution I'm overlooking?