The WebSocket()
constructor returns a new WebSocket
object.
Syntax
var aWebSocket = new WebSocket(url [, protocols]);
Parameters
url
- The URL to which to connect; this should be the URL to which the WebSocket server will respond.
protocols
Optional- Either a single protocol string or an array of protocol strings. These strings are used to indicate sub-protocols, so that a single server can implement multiple WebSocket sub-protocols (for example, you might want one server to be able to handle different types of interactions depending on the specified
protocol
). If you don't specify a protocol string, an empty string is assumed.
Exceptions thrown
SECURITY_ERR
- The port to which the connection is being attempted is being blocked.
- SyntaxError
- The URL is invalid.
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'the WebSocket constructor' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
WebSocket() constructor | Chrome Full support Yes | Edge Full support ≤79 | Firefox
Full support
7
| IE ? | Opera Full support Yes | Safari ? | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support 7 | Opera Android ? | Safari iOS ? | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
- See implementation notes.
- See implementation notes.