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
.
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
.
js
blob()
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()
.
A promise that resolves with a Blob
.
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.
js
const myImage = document.querySelector("img"); const myRequest = new Request("flowers.jpg"); fetch(myRequest) .then((response) => response.blob()) .then((myBlob) => { const objectURL = URL.createObjectURL(myBlob); myImage.src = objectURL; });
Specification |
---|
Fetch Standard # ref-for-dom-body-blob① |
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 |
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https://developer.mozilla.org/en-US/docs/Web/API/Response/blob