As an application grows, different services may produce different kinds of errors.

For example:

• User not found.
• Invalid credentials.
• Duplicate email.
• Permission denied.
• Invalid request.

Create a reusable custom error class so the application can carry an HTTP status code and a safe error message.

export class AppError extends Error {
  constructor(message, statusCode = 500) {
    super(message);

    this.statusCode = statusCode;
    this.isOperational = true;

    Error.captureStackTrace(this, this.constructor);
  }
}