errorHandler.js

/**
 * Error handling middleware
 */

const winston = require('winston');
const logger = require('../utils/logger');

/**
 * Central error handling middleware
 */
const errorHandler = (err, req, res, next) => {
  // Log the error
  logger.error({
    message: err.message,
    stack: err.stack,
    path: req.path,
    method: req.method,
    ip: req.ip
  });

  // Determine status code
  const statusCode = err.statusCode || 500;

  // Prepare error response
  const errorResponse = {
    success: false,
    error: {
      message: err.message || 'Internal Server Error',
      code: err.code || 'INTERNAL_ERROR'
    }
  };

  // Add stack trace in development mode
  if (process.env.NODE_ENV === 'development') {
    errorResponse.error.stack = err.stack;
  }

  // Send error response
  res.status(statusCode).json(errorResponse);
};

module.exports = errorHandler;