main.js

var firebaseConfig = {
    apiKey: "AIzaSyB2kMCF_wglD3NPBDjSl6phkYrorRI1LgE",
    authDomain: "minecraft-world-community.firebaseapp.com",
    databaseURL: "https://minecraft-world-community-default-rtdb.firebaseio.com",
    projectId: "minecraft-world-community",
    storageBucket: "minecraft-world-community.appspot.com",
    messagingSenderId: "79164899563",
    appId: "1:79164899563:web:36388146fef46073c63eae"
};
firebase.initializeApp(firebaseConfig);

function loged() {
    user = document.getElementById("username").value;
    password = document.getElementById("userpassword").value;
    if (user != "" && password != "") {
        var userref = firebase.database().ref("/users/" + user + "/status");
        var passref = firebase.database().ref("/users/" + user + "/password");
        var isUserCreated;
        var isJoining = false;
        userref.on("value", data => {
            isUserCreated = data.val();
            if (!isJoining) {
                isJoining = true;
                if (isUserCreated == "online") {
                    passref.on("value", data => {
                        canPass = data.val();
                        if (canPass == password) {
                            localStorage.setItem("user", user);
                            localStorage.setItem("pass", password);
                            window.location = "MinecraftRooms.html";
                        } else {
                            document.getElementById("error").innerHTML = "Incorrect Password";
                            document.getElementById("userpassword").style.borderColor = "red";
                        }
                    })
                } else {
                    document.getElementById("error").innerHTML = "Incorrect Username";
                    document.getElementById("username").style.borderColor = "red";
                }
            }
        });
    } else {
        document.getElementById("error").innerHTML = "All the inputs need a value";
        document.getElementById("username").style.borderColor = "yellow";
        document.getElementById("userpassword").style.borderColor = "yellow";
    }
}

function createAccount() {
    user = document.getElementById("username").value;
    password = document.getElementById("userpassword").value;
    if (user != "" && password != "") {
        var userref = firebase.database().ref("/users/" + user + "/status");
        var isUserCreated;
        var isJoining = false;
        userref.on("value", data => {
            isUserCreated = data.val();
            if (!isJoining) {
                isJoining = true;
                if (isUserCreated == null) {
                    firebase.database().ref("/users/").child(user).update({
                        password: password,
                        status: "online",
                        userImg: "creeper",
                        followers: 0
                    });
                    document.getElementById("error").innerHTML = "Account Sucessfuly Created";
                } else {
                    document.getElementById("error").innerHTML = "This username already exists";
                    document.getElementById("username").style.borderColor = "red";
                }
            }
        });
    } else {
        document.getElementById("error").innerHTML = "All the inputs need a value";
        document.getElementById("username").style.borderColor = "yellow";
        document.getElementById("userpassword").style.borderColor = "yellow";
    }
}