in-gfw helps determine if your application is running behind the Great Firewall of China (GFW). It leverages DNS resolution to check for specific domain discrepancies, providing a boolean result indicating GFW presence. This is useful for adapting your application's behavior or content based on geographical access restrictions, enhancing user experience and compliance with censorship policies. It offers a simple and effective solution for detecting GFW interference within your Node.js environment, enabling informed decision-making in your code.