The path this file is being written to. You can modify this in the 'fileBegin' event in case
you are unhappy with the way formidable generates a temporary path for your files.
OptionalhashIf options.hashAlgorithm calculation was set, you can read the hex digest out of this var
(at the end it will be a string).
The mime type of this file, according to the uploading client.
Calculated based on options provided
The name this file had according to the uploading client.
The size of the uploaded file in bytes. If the file is still being uploaded (see 'fileBegin'
event), this property says how many bytes of the file have been written to disk yet.
Link
https://github.com/node-formidable/formidable#file