WebSocketStream: close() method

The close() method of the {{domxref("WebSocketStream")}} interface closes the WebSocket connection. The method optionally accepts an object containing a custom code and/or reason indicating why the connection was closed.

Syntax

js-nolint

close()
close(options)

Parameters

options {{optional_inline}}
- : An options object containing the following properties:
  - closeCode {{optional_inline}}
    - : A number representing the closing code (see the full list of CloseEvent status codes).
  - reason {{optional_inline}}
    - : A string representing a human-readable description of the reason why the socket connection is closed. The maximum allowed length for a reason string is 123 bytes. The string is automatically encoded as UTF-8 when the function is invoked.

[!NOTE] Depending on the server setup and status code you use, the server may choose to ignore a custom code in favor of a valid code that is correct for the closing reason. Valid codes are 1000, and any code within the range 3000 to 4999, inclusive.

Return value

None (undefined).

Exceptions

SyntaxError {{domxref("DOMException")}}
- : Thrown if the provided reason is longer than the maximum allowed length of 123 bytes.

Examples

const wsURL = "wss://127.0.0.1/";
const wss = new WebSocketStream(wsURL);

setTimeout(() => {
  wss.close({
    closeCode: 1000,
    reason: "That's all folks",
  });
}, 10000);

Specifications

Not currently a part of any specification. See https://github.com/whatwg/websockets/pull/48 for standardization progress.