JSFiddle - React, Tailwind, and code Playground

JavaScript

try {
        var oWebsocket = new WebSocket("ws://localhost:9000/websocket_server.php");
    }  catch(e) {
        alert("Fehler beim Init " + e); ;
    }
 
    oWebsocket.onerror = function(ev){ alert("Fehler - " + JSON.stringify(ev)); };
    oWebsocket.onclose = function(ev){ alert("Close  - " + JSON.stringify(ev.code)); };