PromiseRejectionEvent

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

Constructor

PromiseRejectionEvent()

Creates a PromiseRejectionEvent event with the given parameters.

Properties

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().

Methods

No specific methods; inherits methods from its parent Event.

Events

unhandledrejection

Fired when a JavaScript Promise is rejected but there is no rejection handler to deal with the rejection.

rejectionhandled

Fired when a JavaScript Promise is rejected, and after the rejection is handled by the promise's rejection handling code.

Specifications

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

Browser compatibility

See also

• Promise
• WindowEventHandlers.onrejectionhandled
• WindowEventHandlers.onunhandledrejection