src/middleware/errorHandler.js

function notFoundHandler(req, _res, next) {
  const error = new Error(`Route not found: ${req.method} ${req.originalUrl}`);
  error.statusCode = 404;
  error.errorCode = 'ROUTE_NOT_FOUND';
  next(error);
}

function errorHandler(error, _req, res, _next) {
  const statusCode = error.statusCode || 500;
  const errorCode = error.errorCode || 'INTERNAL_ERROR';

  if (statusCode >= 500) {
    console.error(error);
  }

  res.status(statusCode).json({
    success: false,
    message: error.message || 'Unexpected server error.',
    data: null,
    errorCode,
  });
}

module.exports = {
  notFoundHandler,
  errorHandler,
};