The getAll() method of the FormData interface returns all the values associated with a given key from within a FormData object.

name

A string representing the name of the key you want to retrieve.

An array of values whose key matches the specified name. Otherwise, an empty list.

If we add two username values to a FormData using append():

formData.append("username", "Chris");
formData.append("username", "Bob");

The following getAll() method will return both username values in an array:

formData.getAll("username"); // Returns ["Chris", "Bob"]

• Using FormData objects
• <form>