This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is available in Web Workers, except for Service Workers.
The error event of the Worker interface fires when an error occurs in the worker.
Use the event name in methods like addEventListener(), or set an event handler property.
addEventListener("error", (event) => { })
onerror = (event) => { }
A generic Event.
The following code snippet creates a Worker object using the Worker() constructor and sets up an onerror handler on the resulting object:
const myWorker = new Worker("worker.js");
myWorker.onerror = (event) => {
console.log("There is an error with your worker!");
};
| Specification |
|---|
| HTML> # handler-abstractworker-onerror> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
error_event |
4 | 12 | 3.5 | 10.6 | 4 | 18 | 4 | 11 | 5 | 1.0 | 4.4 | 5 |
© 2005–2025 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Worker/error_event