web api instance property
PromiseRejectionEvent: reason property
Available in workers
The PromiseRejectionEvent reason read-only
property is any JavaScript value or Object which provides the reason
passed into reject(). This in theory provides information about
why the promise was rejected.
Value
A value or object which provides information you can use to understand why the promise was rejected. This could be anything from an error code to an object with text, links, and whatever else you might wish to include.
Examples
window.onunhandledrejection = (e) => {
console.log(e.reason);
};
Specifications
SpecificationsStandards references are available on the canonical MDN page.
Browser compatibility
Browser compatibilityCompatibility data is available on the canonical MDN page.