What design patterns do you apply in your practice and why?

In practice, I often use the following design patterns in Node.js:

• Module Pattern — for organizing code into separate files and namespaces, improving readability and reusability.
• Factory — for creating objects with different configurations without directly calling constructors, useful when working with different types of services or connections.
• Promises and async/await (Asynchronous programming pattern) — for managing asynchronous code more conveniently, improving readability and error handling.
• Middleware — in Express.js and other frameworks, for sequential request processing, allowing to split logic into independent parts.
• Singleton — for creating a single instance of an object, e.g., for database connection or caching.

These patterns help write clean, maintainable, and scalable code, especially in a dynamic Node.js environment.