WebSocket: readyState 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 WebSocket.readyState read-only property returns the current state of the WebSocket connection.

Value

A number which is one of the four possible state constants defined on the WebSocket interface:

WebSocket.CONNECTING (0)

Socket has been created. The connection is not yet open.

WebSocket.OPEN (1)

The connection is open and ready to communicate.

WebSocket.CLOSING (2)

The connection is in the process of closing.

WebSocket.CLOSED (3)

The connection is closed or couldn't be opened.

Specifications

Specification
WebSockets
# ref-for-dom-websocket-readystate①

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
readyState

Legend

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Full support
Full support