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.
reason = PromiseRejectionEvent.reason
| Specification | Status | Comment |
|---|---|---|
| WHATWG HTML Living Standard The definition of 'PromiseRejectionEvent.reason' in that specification. | Living Standard | Initial definition. |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 49 | No support | No support | No support | No support |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | No support | No support | No support | No support | No support |
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https://developer.mozilla.org/en-US/docs/Web/API/PromiseRejectionEvent/reason