Appends a new value onto an existing key inside a FormData object, or adds the key if it does not already exist.
The difference between set() and append() is that if the specified key already exists, set() will overwrite all existing values with the new one, whereas append() will append the new value onto the end of the existing set of values.
The name of the field whose data is contained in value.
OptionalfileName: stringThe filename reported to the server, when a Blob or File is passed as the second parameter. The default filename for Blob objects is "blob". The default filename for File objects is the file's filename.
Returns all the values associated with a given key from within a FormData object.
A name of the value you want to retrieve.
An array of FormDataEntryValue whose key matches the value passed in the name parameter. If the key doesn't exist, the method returns an empty list.
Returns an iterator allowing to go through the FormData key/value pairs.
The key of each pair is a string; the value is a FormDataValue.
An alias for FormDataLike#entries()
This interface reflects minimal shape of the FormData