Window: messageerror event

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2023.

The messageerror event is fired on a 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 addEventListener(), or set an event handler property.

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

onmessageerror = (event) => { }

Event type

A MessageEvent. Inherits from Event.

Event MessageEvent

Event properties

This interface also inherits properties from its parent, Event.

MessageEvent.data Read only

The data sent by the message emitter.

MessageEvent.origin Read only

A string representing the origin of the message emitter.

MessageEvent.lastEventId Read only

A string representing a unique ID for the event.

MessageEvent.source Read only

A MessageEventSource (which can be a WindowProxy, MessagePort, or ServiceWorker object) representing the message emitter.

MessageEvent.ports Read only

An array of 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).

Examples

Listen for messageerror using addEventListener():

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

The same, but using the onmessageerror event handler property:

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

Specifications

Specification

HTML
# event-messageerror

HTML
# handler-window-onmessageerror

Browser compatibility

Enable JavaScript to view this browser compatibility table.

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This page was last modified on May 2, 2025 by MDN contributors.

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