The WebSocket.readyState read-only property returns the current state of the WebSocket connection.
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.
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 Standard # ref-for-dom-websocket-readystate① |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | ||
readyState |
5 | 12 | 7 | 12.1 | 5 | 18 | 7 | 12.1 | 4.2 | 1.0 | 4.4 | |
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https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/readyState