Web/API/Body

The Body mixin of the Fetch API represents the body of the response/request, allowing you to declare what its content type is and how it should be handled.

Body is implemented by both Request and Response. This provides these objects with an associated body (a stream), a used flag (initially unset), and a MIME type (initially the empty byte sequence).

Properties

Body.body Read only

A simple getter used to expose a ReadableStream of the body contents.

Body.bodyUsed Read only

A Boolean that indicates whether the body has been read.

Methods

Body.arrayBuffer()

Takes a Response stream and reads it to completion. It returns a promise that resolves with an ArrayBuffer.

Body.blob()

Takes a Response stream and reads it to completion. It returns a promise that resolves with a Blob.

Body.formData()

Takes a Response stream and reads it to completion. It returns a promise that resolves with a FormData object.

Body.json()

Takes a Response stream and reads it to completion. It returns a promise that resolves with the result of parsing the body text as JSON.

Body.text()

Takes a Response stream and reads it to completion. It returns a promise that resolves with a USVString (text). The response is always decoded using UTF-8.

Examples

The example below uses a simple fetch call to grab an image and display it in an <img> tag. You'll notice that since we are requesting an image, we need to run Body.blob() (Response implements body) to give the response its correct MIME type.

HTML Content

<img class="my-image" src="https://wikipedia.org/static/images/project-logos/frwiki-1.5x.png">

JS Content

const myImage = document.querySelector('.my-image');
fetch('https://upload.wikimedia.org/wikipedia/commons/7/77/Delete_key1.jpg')
    .then(res => res.blob())
    .then(res => {
        const objectURL = URL.createObjectURL(res);
        myImage.src = objectURL;
});

Specifications

Specification	Status	Comment
FetchThe definition of 'Body' in that specification.	Living Standard

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

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
Body	Chrome Full support 42 Full support 42 Full support 41 Disabled' Disabled' From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.	Edge Full support ≤18	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 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari Full support 10.1	WebView Android Full support 42	Chrome Android Full support 42	Firefox Android ?	Opera Android Full support 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari iOS Full support 10.3	Samsung Internet Android Full support 4.0
arrayBuffer Experimental'	Chrome Full support 42 Full support 42 Full support 41 Disabled' Disabled' From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.	Edge Full support ≤18	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 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari Full support 10.1	WebView Android No support No	Chrome Android Full support 42	Firefox Android No support No	Opera Android Full support 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari iOS Full support 10.3	Samsung Internet Android Full support 4.0
blob Experimental'	Chrome Full support 42 Full support 42 Full support 41 Disabled' Disabled' From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.	Edge Full support ≤18	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 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari Full support 10.1	WebView Android No support No	Chrome Android Full support 42	Firefox Android No support No	Opera Android Full support 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari iOS Full support 10.3	Samsung Internet Android Full support 4.0
body Experimental'	Chrome Full support 52	Edge Full support ≤18	Firefox Full support 65 Full support 65 Full support 57 Disabled' Disabled' From version 57: this feature is behind the dom.streams.enabled preference (needs to be set to true) and the javascript.options.streams preference (needs to be set to true). To change preferences in Firefox, visit about:config.	IE No support No	Opera Full support 39	Safari Full support 11.1	WebView Android Full support 52	Chrome Android Full support 52	Firefox Android Full support 65 Full support 65 Full support 57 Disabled' Disabled' From version 57: this feature is behind the dom.streams.enabled preference (needs to be set to true) and the javascript.options.streams preference (needs to be set to true). To change preferences in Firefox, visit about:config.	Opera Android Full support 41	Safari iOS Full support 11.3	Samsung Internet Android Full support 6.0
bodyUsed Experimental'	Chrome Full support 42 Full support 42 Full support 41 Disabled' Disabled' From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.	Edge Full support ≤18	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 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari Full support 10.1	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android Full support 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari iOS Full support 10.3	Samsung Internet Android No support No
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
json Experimental'	Chrome Full support 42 Full support 42 Full support 41 Disabled' Disabled' From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.	Edge Full support ≤18	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 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari Full support 10.1	WebView Android No support No	Chrome Android Full support 42	Firefox Android No support No	Opera Android Full support 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari iOS Full support 10.3	Samsung Internet Android Full support 4.0
text Experimental'	Chrome Full support 42 Full support 42 Full support 41 Disabled' Disabled' From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.	Edge Full support ≤18	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 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari Full support 10.1	WebView Android No support No	Chrome Android Full support 42	Firefox Android No support No	Opera Android Full support 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the Experimental Web Platform Features preference.	Safari iOS Full support 10.3	Samsung Internet Android Full support 4.0

Legend

Full support  

Full support

Partial support  

Partial support

No support  

No support

Compatibility unknown  

Compatibility unknown

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.

See also

• ServiceWorker API
• HTTP access control (CORS)
• HTTP

Body by Mozilla Contributors is licensed under CC-BY-SA 2.5.