diff --git a/scripts/setup.js b/scripts/setup.js
index f614e4d..dff3ff1 100644
--- a/scripts/setup.js
+++ b/scripts/setup.js
@@ -8,7 +8,7 @@ console.log('🚀 Setting up StackIt Q&A Platform...\n')
 
 // Check if Node.js version is compatible
 const nodeVersion = process.version
-const majorVersion = parseInt(nodeVersion.slice(1).split('.')[0])
+const majorVersion = parseInt(nodeVersion.slice(1, 10).split('.')[0])
 if (majorVersion < 16) {
   console.error('❌ Node.js version 16 or higher is required')
   console.error(`Current version: ${nodeVersion}`)
diff --git a/server/index.js b/server/index.js
index 71006bd..f289ce5 100644
--- a/server/index.js
+++ b/server/index.js
@@ -65,7 +65,7 @@ const shouldEnableRateLimit = () => {
 const getRateLimitMax = () => {
   // Environment variable override takes precedence
   if (process.env.RATE_LIMIT_MAX) {
-    return parseInt(process.env.RATE_LIMIT_MAX);
+    return parseInt(process.env.RATE_LIMIT_MAX, 10);
   }
 
   // Production: 100 requests per 15 minutes
diff --git a/server/routes/notifications.js b/server/routes/notifications.js
index 4f6b81a..9670483 100644
--- a/server/routes/notifications.js
+++ b/server/routes/notifications.js
@@ -6,8 +6,8 @@ const Notification = require('../models/Notification')
 // Get user's notifications
 router.get('/', authenticateToken, async (req, res) => {
   try {
-    const page = parseInt(req.query.page) || 1
-    const limit = parseInt(req.query.limit) || 20
+    const page = parseInt(req.query.page, 10) || 1
+    const limit = parseInt(req.query.limit, 10) || 20
     const skip = (page - 1) * limit
 
     const notifications = await Notification.find({ recipient: req.user._id })
diff --git a/server/routes/questions.js b/server/routes/questions.js
index 9d64260..f126d54 100644
--- a/server/routes/questions.js
+++ b/server/routes/questions.js
@@ -108,14 +108,14 @@ router.get('/', async (req, res) => {
       .populate('author', 'username reputation avatar')
       .sort(sortOption)
       .skip(skip)
-      .limit(parseInt(limit))
+      .limit(parseInt(limit, 10))
       .lean()
 
     const total = await Question.countDocuments(query)
     const totalPages = Math.ceil(total / limit)
 
     // Add virtual fields
-    const questionsWithVirtuals = questions.map(q => ({
+    const questionsWithVirtuals = (questions ?? []).map(q => ({
       ...q,
       voteCount: q.votes.upvotes.length - q.votes.downvotes.length,
       totalVotes: q.votes.upvotes.length + q.votes.downvotes.length,
@@ -126,7 +126,7 @@ router.get('/', async (req, res) => {
     res.json({
       questions: questionsWithVirtuals,
       pagination: {
-        currentPage: parseInt(page),
+        currentPage: parseInt(page, 10),
         totalPages,
         total,
         hasNext: page < totalPages,
diff --git a/server/routes/tags.js b/server/routes/tags.js
index 17e5140..b7a19c0 100644
--- a/server/routes/tags.js
+++ b/server/routes/tags.js
@@ -21,7 +21,7 @@ router.get('/', async (req, res) => {
 
     const tags = await Tag.find(query)
       .sort({ questionCount: -1, name: 1 })
-      .limit(parseInt(limit))
+      .limit(parseInt(limit, 10))
 
     res.json(tags)
   } catch (error) {
@@ -34,7 +34,7 @@ router.get('/', async (req, res) => {
 router.get('/popular', async (req, res) => {
   try {
     const { limit = 10 } = req.query
-    const tags = await Tag.getPopularTags(parseInt(limit))
+    const tags = await Tag.getPopularTags(parseInt(limit, 10))
     res.json(tags)
   } catch (error) {
     console.error('Error fetching popular tags:', error)
@@ -46,7 +46,7 @@ router.get('/popular', async (req, res) => {
 router.get('/trending', async (req, res) => {
   try {
     const { limit = 10 } = req.query
-    const tags = await Tag.getTrendingTags(parseInt(limit))
+    const tags = await Tag.getTrendingTags(parseInt(limit, 10))
     res.json(tags)
   } catch (error) {
     console.error('Error fetching trending tags:', error)
@@ -63,7 +63,7 @@ router.get('/search', async (req, res) => {
       return res.status(400).json({ message: 'Search query is required' })
     }
 
-    const tags = await Tag.searchTags(q, parseInt(limit))
+    const tags = await Tag.searchTags(q, parseInt(limit, 10))
     res.json(tags)
   } catch (error) {
     console.error('Error searching tags:', error)
@@ -127,7 +127,7 @@ router.get('/:name/questions', async (req, res) => {
       .populate('author', 'username')
       .sort(sortOption)
       .skip(skip)
-      .limit(parseInt(limit))
+      .limit(parseInt(limit, 10))
 
     const total = await Question.countDocuments({ tags: tag.name })
 
@@ -135,8 +135,8 @@ router.get('/:name/questions', async (req, res) => {
       tag,
       questions,
       pagination: {
-        page: parseInt(page),
-        limit: parseInt(limit),
+        page: parseInt(page, 10),
+        limit: parseInt(limit, 10),
         total,
         pages: Math.ceil(total / limit)
       }