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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.

This object provides information about a Promise that has been rejected.


Creates a new PromiseRejection object.


Inherits properties from its ancestor, Event.

PromiseRejection.promise Read only
Returns the promise identifier that this notification is about.
PromiseRejection.reason Read only
Returns the reason the promise was rejected.


Specification Status Comment
Unhandled Rejection Tracking Browser Events
The definition of 'PromiseRejectionEvent' in that specification.
Editor's Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 49.0 No support No support 24 No support
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 49.0 No support No support No support ? No support 49.0

See also

Document Tags and Contributors

 Contributors to this page: dgashmdn, jpmedley, rolfedh
 Last updated by: dgashmdn,