android-api-dto-safety

Prevent NullPointerExceptions when parsing API responses by hardening Kotlin DTOs with safe nullability defaults. Adjusting DTO fields and mappers to handle unexpected nulls avoids runtime crashes without altering the backend contract.

Safely adjust Kotlin DTOs by updating field nullability and mapper logic to match the new API contract. This local modification prevents parsing errors and app crashes while maintaining existing functionality and avoiding non-null assertions.

Yes, this DTO safety approach works with Retrofit, Moshi, and Gson. It enhances Android Kotlin API data transfer objects and their mapping logic to improve nullability and contract safety across these specific parsing libraries.

Your Android app crashes from missing API fields because Kotlin DTOs likely use non-null assertions that fail during parsing. Replacing these assertions with safe defaults and nullable fields in your DTOs prevents such runtime crashes.

The best way to handle mismatched fields in Android API DTOs is to verify contract adherence and update mappers locally. Preferring safe defaults over non-null assertions ensures parsing errors for 4xx or 5xx responses are minimized.

You should not use non-null assertions in Kotlin API DTOs when an API response might change or omit fields. Relying on safe defaults and proper nullability handling prevents unexpected parsing failures and runtime NPEs.