Fixed issue with upload doctype

backend/routes/knowledgeBase.js

@@ -40,12 +40,27 @@ function createKnowledgeBaseRouter(db, upload) {
   }
 
   // POST /api/knowledge-base/upload - Upload new document
-  router.post('/upload', requireAuth(db), requireRole(db, 'editor', 'admin'), upload.single('file'), async (req, res) => {
+  router.post('/upload', requireAuth(db), requireRole(db, 'editor', 'admin'), (req, res, next) => {
+    upload.single('file')(req, res, (err) => {
+      if (err) {
+        console.error('[KB Upload] Multer error:', err);
+        return res.status(400).json({ error: err.message || 'File upload failed' });
+      }
+      next();
+    });
+  }, async (req, res) => {
+    console.log('[KB Upload] Request received:', {
+      hasFile: !!req.file,
+      body: req.body,
+      contentType: req.headers['content-type']
+    });
+
     const uploadedFile = req.file;
     const { title, description, category } = req.body;
 
     // Validate required fields
     if (!title || !title.trim()) {
+      console.error('[KB Upload] Error: Title is missing');
       if (uploadedFile) fs.unlinkSync(uploadedFile.path);
       return res.status(400).json({ error: 'Title is required' });
     }

backend/server.js

@@ -108,7 +108,11 @@ app.use(cors({
   origin: CORS_ORIGINS,
   credentials: true
 }));
-app.use(express.json({ limit: '1mb' }));
+// Only parse JSON for requests with application/json content type
+app.use(express.json({
+  limit: '1mb',
+  type: 'application/json'
+}));
 app.use(cookieParser());
 app.use('/uploads', express.static('uploads', {
     dotfiles: 'deny',