The PromiseRejectionEvent interface represents events which are fired when JavaScript Promises are rejected. These events are particularly useful for telemetry and debugging purposes.


Creates a PromiseRejectionEvent event with the given parameters.


Also inherits properties from its parent Event.

PromiseRejectionEvent.promise Read only
The JavaScript Promise which resulted in rejection.
PromiseRejectionEvent.reason Read only
A value or Object indicating why the promise was rejected, as passed to Promise.reject().


No specific methods; inherits methods from its parent Event.


Fired when a JavaScript Promise is rejected but there is no rejection handler to deal with the rejection.
Fired when a JavaScript Promise is rejected, and after the rejection is handled by the promise's rejection handling code.


Specification Status Comment
WHATWG HTML Living Standard
The definition of 'PromiseRejectionEvent' in that specification.
Living Standard Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 49 No support No support No support No support
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support No support No support No support

See also

Document Tags and Contributors

 Contributors to this page: fscholz, Sheppy
 Last updated by: fscholz,