Jquery and HTML FormData returns "Uncaught TypeError: Illegal invocation"

jQuery processes the data attribute and converts the values into strings.

Adding processData: false to your options object fixes the error, but I'm not sure if it fixes the problem.

I had the same problem

I fixed that by using two options

contentType: falseprocessData: false

Actually I Added these two command to my $.ajax({}) function

jquery ajax html upload

Adding processData: false to the $.ajax options will fix this issue.

CodeHunter