/Web APIs

WebSocket: error event

The error event is fired when a connection with a WebSocket has been closed due to an error (some data couldn't be sent for example).


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

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

onerror = (event) => {};

Event type

A generic Event.


// Create WebSocket connection
const socket = new WebSocket("ws://localhost:8080");

// Listen for possible errors
socket.addEventListener("error", (event) => {
  console.log("WebSocket error: ", event);


Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
error_event 5 12 7 10 12.1 5 ≤37 18 7 12.1 4.2 1.0

See also

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