FormData

new FormData()

The constructor initializes a FormData object.

formData.append(key, value, [fileName])

Appends a key value pair into FormData. If the value is either ArrayBuffer and TypedArray, its buffer as well as the object are copied. However, if the value is a File object value, the File object is cloned but its content is not cloned. Consequently, the File object and the cloned one refer to the same content.

Param
Type
Default
Description
key
string
a key string for the pair
value
string | ArrayBuffer | TypedArray | File
a value for the pair
[fileName]
string
null
the optional file name to use for a File object value. If not present, the file name would be taken from the name property of the File object.

formData.entries()

Returns: iterator for all key-value pairs in FormData.