Handling Large JSON Payloads in Node.js with Express and Multer - Unexpected Memory Usage
Does anyone know how to I'm working on a personal project and I'm working on a Node.js application using Express (version 4.17.1) and Multer (version 1.4.2) to handle file uploads. Recently, I've encountered an issue when trying to upload large JSON files (up to 20MB). The server consumes a significant amount of memory during the upload process, and I sometimes experience a memory leak that leads to crashes. I have configured Multer to limit the file size to 20MB, but I still see the memory usage spiking. Here’s my current code snippet that sets up Multer: ```javascript const express = require('express'); const multer = require('multer'); const app = express(); const storage = multer.memoryStorage(); const upload = multer({ storage: storage, limits: { fileSize: 20 * 1024 * 1024 } }); app.post('/upload', upload.single('jsonFile'), (req, res) => { console.log(req.file); // Logging the uploaded file res.send('File uploaded successfully!'); }); app.listen(3000, () => { console.log('Server is running on port 3000'); }); ``` I’ve tried monitoring the memory usage using `process.memoryUsage()` and found that the `heapUsed` and `heapTotal` values keep increasing every time I upload a large file. I also attempted to stream the uploaded data directly to a database to avoid holding the entire file in memory, but I was still facing memory constraints since the JSON parsing seems to consume additional memory. I’m unsure if there’s a better way to handle large JSON uploads in Node.js without exhausting memory. Are there any best practices to implement that would help manage this situation more effectively? Also, is there a safe way to parse large JSON files without causing the application to crash? I'm working on a service that needs to handle this. Thanks in advance! For context: I'm using Javascript on Ubuntu. How would you solve this? Thanks for your help in advance!