minecraft-launcher-registration/public/js/chat.js

function getCookie(name) {
    const value = `; ${document.cookie}`;
    const parts = value.split(`; ${name}=`);
    if (parts.length === 2) return parts.pop().split(';').shift();
}

$(document).ready(() => {
    //prod
    // const socket = new WebSocket('wss://auth.foxarmy.org');
    //dev
    const socket = new WebSocket('ws://localhost:3000');

    socket.onmessage = message => {
        console.log(message)
    }

    const sendData = async () => {
        const jwt = getCookie("jwt");
        const author = await (await fetch(`/api/getUsername`)).json()
        const content = $("#chat-input").val();

        const message = {
            jwt, author, content
        };

        socket.send(JSON.stringify(message));
    }

    $("#send-message-button").click(sendData);

    $('#chat-input').keyup(function(e){
        if(e.keyCode == 13)
        {
            $(this).trigger("enterKey");
        }
    });

    $("#chat-input").bind("enterKey", sendData);
});