CloseEvent: wasClean property
Note: This feature is available in Web Workers.
The wasClean read-only property of the CloseEvent interface returns true if the connection closed cleanly.
Value
A boolean value. True if the connection closed cleanly, false otherwise.
Examples
The following example prints the value of wasClean to the console.
js
WebSocket.onclose = (event) => {
console.log(event.wasClean);
};