Improve centralized error handling

src/middlewares/auth/authMiddleware.js

@@ -48,12 +48,6 @@ export const authenticate = async (req, res, next) => {
       });
     }
 
-    return res.status(401).json({
-      success: false,
-      error: {
-        message: 'Neplatný alebo expirovaný token',
-        statusCode: 401,
-      },
-    });
+    return next(error);
   }
 };

src/middlewares/global/errorHandler.js

@@ -2,11 +2,19 @@ import { formatErrorResponse } from '../../utils/errors.js';
 import { logger } from '../../utils/logger.js';
 
 export function errorHandler(err, req, res, next) {
+  if (res.headersSent) {
+    return next(err);
+  }
+
   // Log error
   logger.error('Unhandled error', err);
 
   // Get status code
-  const statusCode = err.statusCode || res.statusCode !== 200 ? res.statusCode : 500;
+  const statusCode = typeof err.statusCode === 'number'
+    ? err.statusCode
+    : res.statusCode >= 400
+      ? res.statusCode
+      : 500;
 
   // Format error response
   const errorResponse = formatErrorResponse(err, process.env.NODE_ENV === 'development');