Window: messageerror event

Baseline 2023

Newly available

Since March 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

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.


Use the event name in methods like addEventListener(), or set an event handler property.

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

onmessageerror = (event) => {};

Event type

Event properties

This interface also inherits properties from its parent, Event. 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).


Listen for messageerror using addEventListener():

window.addEventListener("messageerror", (event) => {

The same, but using the onmessageerror event handler property:

window.onmessageerror = (event) => {


HTML Standard
# event-messageerror
HTML Standard
# handler-window-onmessageerror

Browser compatibility

BCD tables only load in the browser

See also