Because when making a request encoded as multipart/form-data (which is a requirement for file uploads) all you can send is a flat list of name=value pairs - where value may either be a string or a file.
If you try to add an array or an object directly to the FormData object, it will be implicitly converted to a string, which is probably not what you want (resulting in, for example, "[object Object]" or "12,15,28,55").
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Because when making a request encoded as
multipart/form-data(which is a requirement for file uploads) all you can send is a flat list ofname=valuepairs - wherevaluemay either be a string or a file.If you try to add an array or an object directly to the
FormDataobject, it will be implicitly converted to a string, which is probably not what you want (resulting in, for example,"[object Object]"or"12,15,28,55").