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backend/src/core/middleware/error.middleware.ts

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+/**
+ * @ai-summary Global error handling middleware
+ */
+import { Request, Response, NextFunction } from 'express';
+import { logger } from '../logging/logger';
+
+export const errorHandler = (
+  err: Error,
+  req: Request,
+  res: Response,
+  _next: NextFunction
+) => {
+  logger.error('Unhandled error', {
+    error: err.message,
+    stack: err.stack,
+    path: req.path,
+    method: req.method,
+  });
+
+  res.status(500).json({
+    error: 'Internal server error',
+    message: process.env.NODE_ENV === 'development' ? err.message : undefined,
+  });
+};

backend/src/core/middleware/logging.middleware.ts

@@ -0,0 +1,26 @@
+/**
+ * @ai-summary Request logging middleware
+ */
+import { Request, Response, NextFunction } from 'express';
+import { logger } from '../logging/logger';
+
+export const requestLogger = (
+  req: Request,
+  res: Response,
+  next: NextFunction
+) => {
+  const start = Date.now();
+
+  res.on('finish', () => {
+    const duration = Date.now() - start;
+    logger.info('Request processed', {
+      method: req.method,
+      path: req.path,
+      status: res.statusCode,
+      duration,
+      ip: req.ip,
+    });
+  });
+
+  next();
+};