I encountered an Error: Unexpected end of form originating from the busboy library, specifically within its Multipart._final method. While I'm using multer for file uploads, the issue isn't likely within multer itself, as multer integrates with (or uses) busboy internally to handle multipart form data. The problem often arises from conflicting Express middleware. If you are also using the express-fileupload middleware globally (e.g., with app.use(fileUpload()) in your app.js or main server file), this is likely the cause. Both multer (via busboy) and express-fileupload attempt to parse the incoming form data stream. This conflict can lead to one middleware consuming the stream prematurely, causing busboy to signal an unexpected end. To resolve this, remove the global app.use(fileUpload()) middleware registration from your application setup.