Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("rejectionhandled", (event) => { })

onrejectionhandled = (event) => { }

Event type

A PromiseRejectionEvent. Inherits from Event.

Event properties

PromiseRejectionEvent.promise Read only

The JavaScript Promise that was rejected.

PromiseRejectionEvent.reason Read only

A value or Object indicating why the promise was rejected, as passed to Promise.reject().

Event handler aliases

In addition to the Window interface, the event handler property onrejectionhandled is also available on the following targets:

• HTMLBodyElement
• HTMLFrameSetElement
• SVGSVGElement

Example

You can use the rejectionhandled event to log promises that get rejected to the console, along with the reasons why they were rejected:

window.addEventListener("rejectionhandled", (event) => {
  console.log(`Promise rejected; reason: ${event.reason}`);
});

Specifications

Browser compatibility

See also

• Promise rejection events
• PromiseRejectionEvent
• Promise
• unhandledrejection