The blob()
method of the Response
interface takes a Response
stream and reads it to completion. It returns a promise that resolves with a Blob
.
Response.blob()
Syntax
blob()
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
.
Examples
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 |
---|
Fetch Standard # ref-for-dom-body-blob① |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
blob |
42
|
14
|
39
|
No
|
29
|
10.1
|
42
|
42
|
39
|
29
|
10.3
|
4.0
|
See also
© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Response/blob