first commit

src/middleware/error.middleware.ts

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+import { Request, Response, NextFunction } from 'express';
+import logger from '../utils/logger.js';
+import type { ApiResponse } from '../types/index.js';
+
+/**
+ * Global Error Handler Middleware
+ */
+export function errorHandler(
+  error: Error,
+  req: Request,
+  res: Response,
+  _next: NextFunction
+): void {
+  logger.error('Unhandled error', {
+    error: error.message,
+    stack: error.stack,
+    path: req.path,
+    method: req.method,
+  });
+
+  const response: ApiResponse<never> = {
+    success: false,
+    error: {
+      code: 'INTERNAL_ERROR',
+      message: 'An unexpected error occurred. Please try again later.',
+    },
+  };
+
+  res.status(500).json(response);
+}
+
+/**
+ * 404 Not Found Handler
+ */
+export function notFoundHandler(
+  req: Request,
+  res: Response
+): void {
+  const response: ApiResponse<never> = {
+    success: false,
+    error: {
+      code: 'NOT_FOUND',
+      message: `Endpoint ${req.method} ${req.path} not found`,
+    },
+  };
+
+  res.status(404).json(response);
+}
+
+export default errorHandler;