FormData.append()

The append() method of the FormData interface appends a new value onto an existing key inside a FormData object, or adds the key if it does not already exist.

Syntax

append(name, value)
append(name, value, filename)

Parameters

• name
  • : The name of the field whose data is contained in value.
• value
  • : The value of the field. This can be a string or a Blob (including subclasses such as File). If none of these, the value is converted to a string.
• filename optional
  • : The 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.

Return value

undefined