diff --git a/frontend/js/hero_fx.js b/frontend/js/hero_fx.js
index 7f694637..9b8cb202 100644
--- a/frontend/js/hero_fx.js
+++ b/frontend/js/hero_fx.js
@@ -22,7 +22,7 @@ document.addEventListener("DOMContentLoaded", () => {
     let decoded = 0;
 
     const interval = setInterval(() => {
-      titleSpan.innerText = targetText
+      titleSpan.textContent = targetText
         .split("")
         .map((letter, index) => {
           if (index < decoded) return targetText[index];
diff --git a/frontend/js/navbar.js b/frontend/js/navbar.js
index f67e0349..e2f11547 100644
--- a/frontend/js/navbar.js
+++ b/frontend/js/navbar.js
@@ -4,7 +4,7 @@ document.addEventListener("DOMContentLoaded", () => {
 
   const currentPath = window.location.pathname;
 
-  nav.innerHTML = `
+  nav.textContent = `
     <div class="container">
       <a href="/" class="nav-brand">
         <img src="/assets/logo.png" alt="CodePVG Logo" class="nav-logo" />
diff --git a/frontend/js/user/badges.js b/frontend/js/user/badges.js
index 97823f3c..3fc047b0 100644
--- a/frontend/js/user/badges.js
+++ b/frontend/js/user/badges.js
@@ -112,7 +112,7 @@ export async function loadBadges(data) {
       ranks.overall.rank !== "--"
     ) {
       const overallRank = parseInt(ranks.overall.rank, 10);
-      if (!isNaN(overallRank) && overallRank <= 10) {
+      if (!Number.isNaN(overallRank) && overallRank <= 10) {
         earnedSet.add("TOP_BRASS");
       }
     }