title	short-title	slug	page-type	browser-compat
Window: messageerror event	messageerror	Web/API/Window/messageerror_event	web-api-event	api.Window.messageerror_event

The messageerror event is fired on a {{domxref('Window')}} object when it receives a message that can't be deserialized.

This event is not cancellable and does not bubble.

Syntax

Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.

addEventListener("messageerror", (event) => {});

onmessageerror = (event) => {};

Event type

A {{domxref("MessageEvent")}}. Inherits from {{domxref("Event")}}.

This interface also inherits properties from its parent, {{domxref("Event")}}.

{{domxref("MessageEvent.data")}} {{ReadOnlyInline}}
- : The data sent by the message emitter.
{{domxref("MessageEvent.origin")}} {{ReadOnlyInline}}
- : A string representing the origin of the message emitter.
{{domxref("MessageEvent.lastEventId")}} {{ReadOnlyInline}}
- : A string representing a unique ID for the event.
{{domxref("MessageEvent.source")}} {{ReadOnlyInline}}
- : A MessageEventSource (which can be a {{glossary("WindowProxy")}}, {{domxref("MessagePort")}}, or {{domxref("ServiceWorker")}} object) representing the message emitter.
{{domxref("MessageEvent.ports")}} {{ReadOnlyInline}}
- : An array of {{domxref("MessagePort")}} objects representing the ports associated with the channel the message is being sent through (where appropriate, e.g. in channel messaging or when sending a message to a shared worker).

Listen for messageerror using {{domxref("EventTarget/addEventListener", "addEventListener()")}}:

window.addEventListener("messageerror", (event) => {
  console.error(event);
});

The same, but using the onmessageerror event handler property:

window.onmessageerror = (event) => {
  console.error(event);
};