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The PromiseRejectionEvent interface represents events which are sent to the global script context when JavaScript Promises are rejected. These events are particularly useful for telemetry and debugging purposes.

Constructor

PromiseRejectionEvent()
Creates a PromiseRejectionEvent event, given the type of event (unhandledrejection or rejectionhandled) and other details.

Properties

Also inherits properties from its parent Event.

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().

Methods

This interface has no unique methods; inherits methods from its parent Event.

Events

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

Examples

This simple example catches unhandled promise rejections and logs them for debugging purposes.

window.onunhandledrejection = function(e) {
  console.log(e.reason);
}

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
PromiseRejectionEventChrome Full support 49Edge ? Firefox No support No
Notes Disabled
No support No
Notes Disabled
Notes Firefox doesn't yet send the unhandledrejection or understand rejectionhandled events. Completing the implementation will be addressed in bug 1362272.
Disabled This feature is behind the dom.promise_rejection_events.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 36Safari Full support 11WebView Android Full support 49Chrome Android Full support 49Firefox Android No support No
Notes Disabled
No support No
Notes Disabled
Notes Firefox doesn't yet send the unhandledrejection or understand rejectionhandled events. Completing the implementation will be addressed in bug 1362272.
Disabled This feature is behind the dom.promise_rejection_events.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 36Safari iOS Full support 11.3Samsung Internet Android Full support Yes
PromiseRejectionEvent() constructorChrome Full support 49Edge ? Firefox No support No
Disabled
No support No
Disabled
Disabled This feature is behind the dom.promise_rejection_events.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 36Safari Full support 11WebView Android Full support 49Chrome Android Full support 49Firefox Android No support No
Disabled
No support No
Disabled
Disabled This feature is behind the dom.promise_rejection_events.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 36Safari iOS Full support 11.3Samsung Internet Android ?
promiseChrome Full support 49Edge ? Firefox No support No
Disabled
No support No
Disabled
Disabled This feature is behind the dom.promise_rejection_events.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 36Safari Full support 11WebView Android Full support 49Chrome Android Full support 49Firefox Android No support No
Disabled
No support No
Disabled
Disabled This feature is behind the dom.promise_rejection_events.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 36Safari iOS Full support 11.3Samsung Internet Android Full support Yes
reasonChrome Full support 49Edge ? Firefox No support No
Disabled
No support No
Disabled
Disabled This feature is behind the dom.promise_rejection_events.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 36Safari Full support 11WebView Android Full support 49Chrome Android Full support 49Firefox Android No support No
Disabled
No support No
Disabled
Disabled This feature is behind the dom.promise_rejection_events.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 36Safari iOS Full support 11.3Samsung Internet Android Full support Yes

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also

Метки документа и участники

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