myex-cli/src/middlewares/errorHandlers.js

Opinionated Express.js framework with CLI tools

import { logger } from '../utils/logger.js';

/**
 * Configure error handling middleware for the Express app
 * @param {import('express').Application} app - Express application
 */
export const configureErrorHandlers = (app) => {
  // 404 Not Found handler
  app.use(notFoundHandler);
  
  // Global error handler
  app.use(errorHandler);
};

/**
 * Handle 404 not found errors
 * @param {import('express').Request} req - Express request object
 * @param {import('express').Response} res - Express response object
 * @param {import('express').NextFunction} next - Express next function
 */
export const notFoundHandler = (req, res, next) => {
  const error = new Error(`Not Found - ${req.originalUrl}`);
  error.status = 404;
  next(error);
};

/**
 * Global error handler for all errors in the application
 * @param {Error} err - Error object
 * @param {import('express').Request} req - Express request object
 * @param {import('express').Response} res - Express response object
 * @param {import('express').NextFunction} next - Express next function
 */
export const errorHandler = (err, req, res, next) => {
  // Set default status if not set
  const statusCode = err.status || 500;
  
  // Log error details
  if (statusCode === 500) {
    logger.error(`[${req.method}] ${req.path} >> ${err.stack}`);
  } else {
    logger.warn(`[${req.method}] ${req.path} >> ${err.message}`);
  }
  
  // Determine what error information to expose based on environment
  const isDevelopment = process.env.NODE_ENV === 'development';
  
  // Send error response
  res.status(statusCode).json({
    status: 'error',
    statusCode,
    message: err.message,
    ...(isDevelopment && { stack: err.stack }),
  });
};