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The messageerror event is fired on a Worker object when it receives a message that can't be deserialized.

Bubbles No
Cancelable No
Interface MessageEvent
Event handler property onmessageerror

Examples

Create a worker, and listen for message and messageerror events using addEventListener():

// inside main.js

const worker = new Worker("static/scripts/worker.js");

worker.addEventListener("message", (event) => {
    console.error(`Received message from worker: ${event}`);
});

worker.addEventListener("messageerror", (event) => {
    console.error(`Error receiving message from worker: ${event}`);
});

The same, but using the onmessageerror event handler property:

// inside main.js

const worker = new Worker("static/scripts/worker.js");

worker.onmessage = (event) => {
    console.error(`Received message from worker: ${event}`);
};

worker.onmessageerror = (event) => {
    console.error(`Error receiving message from worker: ${event}`);
};

Specifications

Specification Status
HTML Living Standard Living Standard

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
messageerror eventChrome Full support 60Edge Full support 18Firefox Full support 57IE ? Opera Full support 47Safari ? WebView Android Full support 60Chrome Android Full support 60Firefox Android Full support 57Opera Android Full support 47Safari iOS ? Samsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

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