The unhandledrejection event is fired when a JavaScript Promise is rejected but there is no rejection handler to deal with the rejection.

Bubbles No
Cancelable No
Target objects defaultView
Interface PromiseRejectionEvent


window.addEventListener("unhandledrejection", function (event) {
  console.warn("WARNING: Unhandled promise rejection. Shame on you! Reason: "
               + event.reason);


The unhandledrejection event implements the PromiseRejectionEvent interface, which inherits from Event. You can use the properties and methods defined on these interfaces.

See also

Document Tags and Contributors

 Contributors to this page: gkalpak, fscholz, Sheppy
 Last updated by: gkalpak,