How to properly upload files to Node.js server?

Question

Node.js

Hello.
Tell me, for what reason the Node server can not load files?
When starting the server on a localhost, everything works fine, but if I copy the same code to a virtual server and run it there, I can’t upload files from the front form, I get an error 500. I
start the server the same way, without a proxy. Those. it works on its port, as well as when running on a localhost.
At the same time, I receive images uploaded via FTP from the server, and all requests where there are no files work fine.
I use multer to download.
Here is an example code:

const multer = require('multer');
const moment = require('moment');
const path = require('path');

const storage = multer.diskStorage({
  destination(req, file, cb) {
    cb(null, 'files/uploads/');
  },
  filename(req, file, cb) {
    const date = moment().format('DDMMYYYY-HHmmss_SSS');
    const ext = path.extname(file.originalname);
    const name = path.basename(file.originalname, ext);
    cb(null, `${date}-${file.originalname.replace(/\s/g, '')}`);
  },
});

const fileFilter = (req, file, cb) => {
  if (file.mimetype === 'image/png' || file.mimetype === 'image/jpeg') {
    cb(null, true);
  } else {
    cb(null, false);
  }
};

const limits = {
  fileSize: 1024 * 1024 * 5,
};

module.exports = multer({ storage, fileFilter, limits });

Just in case, I run it locally under Windows, and the server is on CentOS + BrainyCP.
I checked the rights of the folder, RWX is everywhere.
Firewall turned off to check.

==========================

Got it. On the server, you need to set the path to the files folder relative to src
cb(null, '../files/uploads/');

Answer 1

To avoid path problems in different environments, always build paths using the __dirname variable or other paths derived from it.
To join several parts of a path into a full path, use path.join
Most libraries build relative paths from process.cwd() , which directly depends on which folder the script was run from.