CloseEvent: wasClean property

Baseline Widely available

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.

The wasClean read-only property of the CloseEvent interface returns true if the connection closed cleanly.

Value

A boolean value. True if the connection closed cleanly, false otherwise.

Examples

The following example prints the value of wasClean to the console.

js
WebSocket.onclose = (event) => {
  console.log(event.wasClean);
};

Specifications

Specification
WebSockets
# ref-for-dom-closeevent-wasclean②

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
Node.js
wasClean

Legend

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Full support
Full support