CloseEvent: CloseEvent() constructor

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since August 2016.

See full compatibility

Note: This feature is available in Web Workers.

The CloseEvent() constructor creates a new CloseEvent object.

Syntax

new CloseEvent(type)
new CloseEvent(type, options)

Parameters

type

A string with the name of the event. It is case-sensitive and browsers always set it to close.

options Optional

An object that, in addition of the properties defined in Event(), has the following properties:

wasClean Optional: A boolean value indicating if the connection has been closed cleanly or not. It defaults to false.
code Optional: An integer representing the connection close code sent by the server. It defaults to 0.
reason Optional: A string containing a human-readable reason describing why the server closed the connection. It defaults to ''

Return value

A new CloseEvent object.

Specifications

Specification
WebSockets # dom-closeevent-closeevent

Browser compatibility

	desktop					mobile							server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`CloseEvent()` constructor	Chrome – Full support Chrome 16 (Release date: 2011-12-13) footnote Full support	Edge – Full support Edge 14 (Release date: 2016-08-02) footnote Full support	Firefox – Full support Firefox 11 (Release date: 2012-03-13) footnote Full support	Opera – Full support Opera 12.1 (Release date: 2012-11-20) footnote Full support	Safari – Full support Safari 6 (Release date: 2012-07-25) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 14 (Release date: 2012-06-26) footnote Full support	Opera Android – Full support Opera Android 12.1 (Release date: 2012-10-09) footnote Full support	Safari on iOS – Full support Safari on iOS 6 (Release date: 2012-09-10) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 6 (Release date: 2012-09-10) footnote Full support	Bun – Full support Bun 1 (Release date: 2023-09-08) footnote Full support	Deno – Full support Deno 1.4 (Release date: 2020-09-13) footnote Full support	Node.js – Full support Node.js 23 (Release date: 2024-10-16) footnote Full support

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Full support: Full support