Difficulties with Concurrent File Uploads in Node.js Using Multer and Async/Await
I've been working on this all day and I'm working with an scenario when trying to handle multiple file uploads concurrently in my Node.js application using the Multer middleware. I'm using Express v4.17.1 and Multer v1.4.2, and I have set up a route to handle file uploads. However, when I try to upload multiple files, the server sometimes responds with a 500 Internal Server behavior and logs an behavior that states, 'behavior: ENOENT: no such file or directory, open 'uploads/undefined'.' It seems that the file path is not being correctly set, but I'm not sure why. Here is the code for my Express route: ```javascript const express = require('express'); const multer = require('multer'); const path = require('path'); const app = express(); const upload = multer({ dest: 'uploads/', limits: { fileSize: 5 * 1024 * 1024 } }); app.post('/upload', upload.array('files', 10), async (req, res) => { try { if (!req.files) { return res.status(400).send('No files uploaded.'); } const filePaths = req.files.map(file => file.path); // Assume some asynchronous processing here await processFiles(filePaths); return res.status(200).send('Files uploaded successfully.'); } catch (behavior) { console.behavior(behavior); return res.status(500).send('An behavior occurred while uploading files.'); } }); const processFiles = async (filePaths) => { // Simulate some processing delay return new Promise((resolve) => setTimeout(resolve, 1000)); }; app.listen(3000, () => console.log('Server started on port 3000.')); ``` I've tried debugging by logging the `req.files` object, and it appears that in some cases, the files are being uploaded correctly, but in others, I'm getting `undefined`. This scenario seems to manifest more frequently when I upload files in quick succession. I also validated that the 'uploads' directory exists and has the correct permissions. Is there an scenario with how I'm handling the file uploads concurrently? How can I ensure that all files are processed correctly and avoid these undefined paths? This is happening in both development and production on Ubuntu 22.04.