utils/AppError.js

class AppError extends Error {
  constructor(message, statusCode) {
    super(message);

    this.statusCode = statusCode;
    this.status = `${statusCode}`.startsWith('4') ? 'fail' : 'error'; // 'fail' for 4xx errors, 'error' for 5xx errors
    this.isOperational = true; // Mark this error as operational (not a programming error)

    // Capture the stack trace (excluding the constructor call)
    Error.captureStackTrace(this, this.constructor);
  }
}

module.exports = { AppError };