How can you handle custom JSON marshaling and unmarshaling logic in Go?

In Go, custom JSON marshaling and unmarshaling logic can be handled by implementing the MarshalJSON and UnmarshalJSON methods for custom types. This allows developers to define how their types are encoded and decoded to and from JSON. By implementing these methods, you gain fine-grained control over the JSON representation of your types, enabling you to handle complex or non-standard JSON structures. This approach is preferred over using reflection or third-party libraries as it provides better performance and flexibility.