let userSignedIn = false; 

// Function to handle login form submission
function handleLogin(event) {
    event.preventDefault(); // Prevent form submission

    // Get input values
    var email = document.getElementById("login-email").value;
    var password = document.getElementById("login-password").value;

    // Retrieve user data from local storage
    var storedUserData = JSON.parse(localStorage.getItem('userData'));

    // Login page confirmation
    if (storedUserData && storedUserData.email === email && storedUserData.password === password) {
        // Redirect or display a message indicating successful login
        alert("Login Successful!!");
        userSignedIn = true;
        window.location.href = "home.html";
        updateLoginLogoutButtons()
    } else {
        // Display an error message indicating invalid credentials
        alert("Wrong Password or Bearname. Please try again.");
    }
}

// Function to update login/logout buttons based on login status
function updateLoginLogoutButtons() {
  if (userSignedIn==true) 
    {
      // User is logged in
      document.getElementById("openModalBtn").style.display = "none"; // Hide login button
      document.getElementById("logoutBtn").style.display = "inline-block"; // Show logout button
  } 
  else if (userSignedIn==false)
  {
      // User is not logged in
      document.getElementById("openModalBtn").style.display = "inline-block"; // Show login button
      document.getElementById("logoutBtn").style.display = "none"; // Hide logout button
  }
}

First of all this is my first time using stack overflow + english is not my first language so i am sorry for any inconvenience.

This is my javascript code for my login and logout button project. I’ve made sure that theres no error in naming or assigning from html to js file. The thing is my logout button wont come out after i successfully logged in. Can anyone point out my mistake?

i’ve tried chatgpt and console log but none of these helps. I am new in website development so please forgive me if my issue is silly.