WorkerGlobalScope: error event

Note: This feature is only available in Web Workers.

The error event of the WorkerGlobalScope interface fires when an error occurs in the worker.

Syntax

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

js
addEventListener("error", (event) => {});

onerror = (message, filename, lineno, colno, error) => {};

Note: For historical reasons, onerror on Window and WorkerGlobalScope objects is the only event handler property that receives more than one argument.

For more details about this, see the page for the error event on Window objects.

Event type

A generic Event.

Example

The following code snippet shows an onerror handler set inside a worker:

js
self.onerror = () => {
  console.log("There is an error inside your worker!");
};

The same snippet, but using addEventListener():

js
self.addEventListener("error", () => {
  console.log("There is an error inside your worker!");
});

Specifications

Specification
HTML
# handler-workerglobalscope-onerror

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
error event

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

See also

The WorkerGlobalScope interface it belongs to.