JavaScript PromiseRejectionEvent : Event

Event data for when a Promise's reject handler is called or an exception is thrown in an Promise executor function or in an async function. See window.onunhandledrejection.

Spec

Instance Properties

promise : Promise readonly

The promise that had the unhandled rejection.

Example:

<script>
  window.onunhandledrejection = function(event) {
    console.log(event.promise === myPromise);
  };

  var myPromise = new Promise(function(resolve, reject) {
    reject('Promise reject');
  });
</script>

Run

Results:

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