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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The ok
read-only property of the Response
interface contains a boolean stating whether the response was successful (status in the range 200-299) or not.
Syntax
var myOK = response.ok;
Value
A Boolean
.
Example
In our Fetch Response example (see Fetch Response live) we create a new Request
object using the Request()
constructor, passing it a JPG path. We then fetch this request using fetch()
, extract a blob from the response using Body.blob
, create an object URL out of it using URL.createObjectURL
, and display this in an <img>
.
Note that at the top of the fetch()
block we log the response ok
value to the console.
var myImage = document.querySelector('img'); var myRequest = new Request('flowers.jpg'); fetch(myRequest).then(function(response) { console.log(response.ok); // returns true if the response returned successfully response.blob().then(function(myBlob) { var objectURL = URL.createObjectURL(myBlob); myImage.src = objectURL; }); });
Specifications
Specification | Status | Comment |
---|---|---|
Fetch The definition of 'ok' in that specification. |
Living Standard | Initial definition |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 42 41[1] |
39 (39) 34[1] |
No support |
29 |
No support |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS (Gecko) | IE Phone | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Basic support | No support | No support | No support | No support | No support | No support | No support |
[1] This feature is implemented behind a preference.