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 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 |
---|---|---|
Fetch The 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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
blob | Chrome
Full support
42
| Edge Full support ≤18 | Firefox
Full support
39
| IE No support No | Opera
Full support
29
| Safari Full support 10 | WebView Android No support No | Chrome Android Full support 42 | Firefox Android No support No | Opera Android
Full support
29
| Safari iOS Full support 10 | 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.