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).

Bubbles No
Cancelable No
Interface Event
Event handler property onerror


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

// Listen for possible errors
socket.addEventListener('error', function (event) {
  console.log('WebSocket error: ', event);


Specification Status
HTML Living Standard
The definition of 'WebSocket error' in that specification.
Living Standard

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
error eventChrome Full support YesEdge Full support 12Firefox Full support YesIE ? Opera Full support YesSafari ? WebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android ? Safari iOS ? Samsung Internet Android Full support Yes


Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also