Body.bodyUsed

The bodyUsed read-only property of the Body mixin contains a Boolean that indicates whether the body has been read yet.

Syntax

var myBodyUsed = response.bodyUsed;

Value

A Boolean.

Example

In our fetch request example (run fetch request live), we create a new request using the Request() constructor, then use it to fetch a JPG. When the fetch is successful, we read a Blob out of the response using blob(), put it into an object URL using URL.createObjectURL, and then set that URL as the source of an <img> element to display the image.

Notice that we log response.bodyUsed to the console once before the response.blob() call and once after. This returns false before and true afterwards, as at that point the body has been read.

HTML Content

<img class="my-image" src="https://udn.realityripple.com/samples/46/29059a2b39.png">

JS Content

var myImage = document.querySelector('.my-image');
fetch('https://upload.wikimedia.org/wikipedia/commons/7/77/Delete_key1.jpg').then(function(response) {
    console.log(response.bodyUsed);
    var res = response.blob();
    console.log(response.bodyUsed);
    return res;
}).then(function(response) {
    var objectURL = URL.createObjectURL(response);
    myImage.src = objectURL;
});

Specifications

Specification Status Comment
Fetch
The definition of 'bodyUsed' in that specification.
Living Standard

Browser compatibility

DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
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 ≤18Firefox 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 NoOpera 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 No support NoWebView Android No support NoChrome Android No support NoFirefox Android No support NoOpera 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 No support NoSamsung Internet Android No support No

Legend

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also