diff --git a/login.js b/login.js
new file mode 100644
index 0000000..3b43ed3
--- /dev/null
+++ b/login.js
@@ -0,0 +1,45 @@
+document.getElementById("loginForm").addEventListener("submit", function(e) {
+  e.preventDefault();
+
+  const username = document.getElementById("username").value.trim();
+  const password = document.getElementById("password").value.trim();
+  const errorBox = document.getElementById("errorBox");
+
+  errorBox.style.display = "none";
+  errorBox.innerText = "";
+
+  if (!username || !password) {
+    showError("Username dan password harus diisi");
+    return;
+  }
+
+  if (password.length < 6) {
+    showError("Password minimal 6 karakter");
+    return;
+  }
+
+  const usersData = localStorage.getItem("users");
+  const users = usersData ? JSON.parse(usersData) : [];
+
+  const user = users.find(u => u.username === username);
+
+  if (!user) {
+    showError("Username tidak ditemukan");
+    return;
+  }
+
+  if (user.password !== password) {
+    showError("Password salah");
+    return;
+  }
+
+  // Login success
+  localStorage.setItem("loggedInUser", JSON.stringify(user));
+  window.location.href = "mainboard.html";
+});
+
+function showError(msg) {
+  const errorBox = document.getElementById("errorBox");
+  errorBox.innerText = msg;
+  errorBox.style.display = "block";
+}