first commit

backend/src/middleware/errorHandler.ts

@@ -0,0 +1,45 @@
+import { Request, Response, NextFunction } from 'express';
+import { logger } from '../utils/logger';
+
+export class AppError extends Error {
+  public statusCode: number;
+  public isOperational: boolean;
+
+  constructor(message: string, statusCode: number = 500) {
+    super(message);
+    this.statusCode = statusCode;
+    this.isOperational = true;
+
+    Error.captureStackTrace(this, this.constructor);
+  }
+}
+
+export function errorHandler(
+  error: AppError,
+  req: Request,
+  res: Response,
+  next: NextFunction
+) {
+  const statusCode = error.statusCode || 500;
+  const message = error.message || 'Internal Server Error';
+
+  // Log error
+  logger.error('Error occurred:', {
+    error: error.message,
+    stack: error.stack,
+    url: req.url,
+    method: req.method,
+    ip: req.ip,
+    userAgent: req.get('User-Agent')
+  });
+
+  // Don't leak error details in production
+  const responseMessage = process.env.NODE_ENV === 'production' && statusCode === 500
+    ? 'Internal Server Error'
+    : message;
+
+  res.status(statusCode).json({
+    error: responseMessage,
+    ...(process.env.NODE_ENV === 'development' && { stack: error.stack })
+  });
+}