Web/API/Body/formData

The formData() method of the Body mixin 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).

Syntax

response.formData()
.then(function(formdata) {
  // do something with your formdata
});

Parameters

None.

Return value

A Promise that resolves with a FormData object.

Example

TBD.

Specifications

Specification	Status	Comment
FetchThe definition of 'formData()' in that specification.	Living Standard

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`formData` Experimental'	Chrome Full support 60	Edge Full support ≤79	Firefox Full support 39 Full support 39 Full support 34 Disabled' Disabled' From version 34: this feature is behind the `dom.fetch.enabled` preference. To change preferences in Firefox, visit about:config.	IE No support No	Opera Full support 47	Safari Partial support 10.1 Notes' Partial support 10.1 Notes' Notes' From Safari 10.1, the method exists but always rejects with `NotSupportedError`. See bug 215671.	WebView Android Full support 60	Chrome Android Full support 60	Firefox Android No support No	Opera Android Full support 44	Safari iOS Partial support 10.3 Notes' Partial support 10.3 Notes' Notes' From Safari for iOS 10.3, the method exists but always rejects with `NotSupportedError`. See bug 215671.	Samsung Internet Android Full support 8.0

Legend

Full support: Full support
Partial support: Partial support
No support: No support
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.
See implementation notes.': See implementation notes.
User must explicitly enable this feature.': User must explicitly enable this feature.