How can I get file size inside fileFilter function?

Am I have any way to get file size inside fileFilter function?

var fileFilter = function (req, file, cb) {
  console.log(file.size); // undefined
}

I have only four first keys in file variable

Key	Description	Note
fieldname	Field name specified in the form
originalname	Name of the file on the user’s computer
encoding	Encoding type of the file
mimetype	Mime type of the file
size	Size of the file in bytes
destination	The folder to which the file has been saved	DiskStorage
filename	The name of the file within the destination	DiskStorage
path	The full path to the uploaded file	DiskStorage
buffer	A Buffer of the entire file	MemoryStorage

[LinusU]

Oh, actually that is very easily solvable in a clean way for you!

var limits = { fileSize: 1024 * 1024 * 1024 }
var upload = multer({ limits: limits })

app.post('/upload', upload.single('file'), function (req, res) {
  res.send({ result: 'ok' })
})

app.use(function (err, req, res, next) {
  if (err.code === 'LIMIT_FILE_SIZE') {
    res.send({ result: 'fail', error: { code: 1001, message: 'File is too big' } })
    return 
  }

  // Handle any other errors
})

The fileSize limit will automatically remove the file if it received a too large file, read more in the readme 😃

[LinusU]

I’m sorry to say that file.size is only available after the file has been received.

This could possibly be fixed by looking at the Content-Length header of that part, but I do not yet know if browsers send those.