The PromiseRejectionEvent
reason
read-only property is any JavaScript value or Object
which provides the reason passed into Promise.reject()
. This in theory provides information about why the promise was rejected.
Syntax
reason = PromiseRejectionEvent.reason
Value
A value or object which provides information you can use to understand why the promise was rejected. This could be anything from an error code to an object with text, links, and whatever else you might wish to include.
Examples
window.onunhandledrejection = function(e) { console.log(e.reason); }
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'PromiseRejectionEvent.reason' in that specification. |
Living Standard | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
reason | Chrome Full support 49 | Edge Full support ≤79 | Firefox
Full support
69
| IE No support No | Opera Full support 36 | Safari Full support 11 | WebView Android Full support 49 | Chrome Android Full support 49 | Firefox Android
Full support
68
| Opera Android Full support 36 | Safari iOS Full support 11.3 | Samsung Internet Android Full support 5.0 |
Legend
- Full support
- Full support
- No support
- No support
- User must explicitly enable this feature.
- User must explicitly enable this feature.