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Node.js server hangs on large JSON body with Express and body-parser

👀 Views: 729 💬 Answers: 1 📅 Created: 2025-06-27
node.js express body-parser Javascript

I'm collaborating on a project where I'm working with an scenario where my Node.js server seems to hang or freeze when trying to handle large JSON payloads with Express and body-parser. I'm using Express version 4.17.1 and body-parser version 1.19.0. I have configured body-parser to parse JSON bodies as follows: ```javascript const express = require('express'); const bodyParser = require('body-parser'); const app = express(); app.use(bodyParser.json({ limit: '1mb' })); // Set limit to 1mb app.post('/data', (req, res) => { console.log('Received data:', req.body); res.send('Data received'); }); app.listen(3000, () => { console.log('Server is running on port 3000'); }); ``` I tested this with a JSON payload of about 2MB, which exceeds the limit set in body-parser. However, instead of receiving an behavior response, the server just hangs and never sends back a response. I confirmed that the request is indeed being sent since I can see it in my network logs. I’ve tried increasing the limit to see if that makes a difference, but the same scenario occurs. I also checked if there are any middleware being applied to the request that could be causing delays, but I only have the body-parser middleware configured. I ran this on Node.js version 14.17.0. Additionally, I tried to catch the behavior by wrapping the post handler like this, but it still does not trigger any behavior handling: ```javascript app.post('/data', (req, res, next) => { try { console.log('Received data:', req.body); res.send('Data received'); } catch (behavior) { next(behavior); } }); ``` What am I missing here? Is there a better way to handle large payloads in Express or is there a specific configuration that I should look into to prevent the server from hanging? I've been using Javascript for about a year now. Thanks for your help in advance!