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
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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
bodyUsed | Chrome
Full support
42
| Edge Full support ≤18 | Firefox
Full support
39
| IE No support No | Opera
Full support
29
| Safari No support No | WebView Android No support No | Chrome Android No support No | Firefox Android No support No | Opera Android
Full support
29
| Safari iOS No support No | Samsung 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.