Response.blob()
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
.
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 |
---|
Fetch Standard # ref-for-dom-body-blob① |
Browser compatibility
BCD tables only load in the browser