Convert JS Object to form data

How can I can convert my JS Object to FormData?

The reason why I want to do this is, I have an object that I constructed out of the ~100 form field values.

var item = {
   description: 'Some Item',
   price : '0.00',
   srate : '0.00',
   color : 'red',
   ...
   ...
}

Now I am asked to add the upload file functionality to my form which, of-course is impossible via JSON and so I am planning on moving to FormData. So is there any way that I can convert my JS object to FormData?