File Uploads
· 6 min read
The typical file upload tutorial is five lines: parse the form, get the file, save it to disk. It works for a homework assignment. It fails the moment someone uploads a 2GB file, or a .exe renamed to .jpg, or a thousand files simultaneously.
Production file handling needs three things the tutorials skip: size limits that protect your server, type validation that goes beyond the extension, and storage patterns that do not block your event loop.