PromiseRejectionEvent: reason property
Note: This feature is available in Web Workers.
The PromiseRejectionEvent reason read-only
property is any JavaScript value or Object which provides the reason
passed into Promise.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
js
window.onunhandledrejection = (e) => {
console.log(e.reason);
};
Specifications
| Specification |
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| HTML # dom-promiserejectionevent-reason |
Browser compatibility
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Legend
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- Full support
- Full support