Body.blob()

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.

Returns

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.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(function(response) {
  return 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

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 42 [1]
 
(Yes) 39 (39) [2] No support

29 [3]

No support
Feature Android Edge Firefox Mobile (Gecko) Firefox OS (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support No support (Yes) No support No support No support No support No support No support

[1] Behind a preference in version 41.

[2] Behind a preference starting with version 34.

[3] Behind a preference in version 28.

See also

Document Tags and Contributors

 Last updated by: chrisdavidmills,