The get() method of the FormData interface returns the first value associated with a given key from within a FormData object. If you expect multiple values and want all of them, use the getAll() method instead.

name

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

A value whose key matches the specified name. Otherwise, null.

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

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

The following get() method will only return the first username value:

formData.get("username"); // Returns "Chris"

• Using FormData objects
• <form>