The formData()
method of the Response
interface takes a Response
stream and reads it to completion. It returns a promise that resolves with a FormData
object.
Note: This is mainly relevant to service workers. If a user submits a form and a service worker intercepts the request, you could for example call formData()
on it to obtain a key-value map, modify some fields, then send the form onwards to the server (or use it locally).