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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 PromiseRejection() constructor creates a new PromiseRejection object.


var myPromi​seRejection = new PromiseRejection(type, init);


The type of the Event.
init Optional
An options object containing any custom settings that you want to apply to the event object. Options are as follows:
  • promise: A reference to a promise object.
  • reason: Optional 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
Basic support 49.0
Feature Chrome for Android
Basic support 49.0

See also

Document Tags and Contributors

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