The blob()
method of the Body
mixin takes a Response
stream and reads it to completion. It returns a promise that resolves with a Blob
.
Syntax
response.blob().then(function(myBlob) { // do something with myBlob });
Parameters
None.
Note: If the Response
has a Response.type
of "opaque"
, the resulting Blob
will have a Blob.size
of 0
and a Blob.type
of empty string ""
, which renders it useless for methods like URL.createObjectURL
.
Return value
A promise that resolves with a Blob
.
Example
In our fetch request example (run [[../../../../../../../mdn.github.io/fetch-examples/fetch-request/index|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.
var myImage = document.querySelector('img');
var myRequest = new Request('flowers.jpg');
fetch(myRequest)
.then(response => response.blob())
.then(function(myBlob) {
var objectURL = URL.createObjectURL(myBlob);
myImage.src = objectURL;
});
Specifications
Specification | Status | Comment |
FetchThe definition of 'blob()' 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 Full support 42 Full support 42 Full support 41 Disabled' From version 41: this feature is behind the |
Edge
Full support ≤18 |
Firefox Full support 39 Full support 39 Full support 34 Disabled' From version 34: this feature is behind the |
IE
No support No |
Opera Full support 29 Full support 29 Full support 28 Disabled' From version 28: this feature is behind the |
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' From version 28: this feature is behind the |
Safari iOS
Full support 10.3 |
Samsung Internet Android
Full support 4.0 |
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
Body.blob() by Mozilla Contributors is licensed under CC-BY-SA 2.5.