Why do we use DTOs in our APIs?

Why do we use DTOs in our APIs? That's a question I have received often as comment to different videos om ASP.Net Core WebAPis. In this video we try to demystify the concept of DTOs and why do we use them? A short answer is that we don't want to expose full domain models in our API contracts, as those models usually contain a lot of information that is not needed to by the consumers of our different endpoints. But there's also a technical reason why DTOs are helpful, as we might get a lot of Json serialization exceptions if we don't use them, especially when we have many-to-many relationships. Chapters: 1. Intro 00:00 2. Explaining the setup 00:55 3. First reason: exposing data that is not needed in the current endpoint context 03:20 4. Second reason: requiring data that is not needed in request bodies 05:33 5. Third reason: JSON serialization exceptions 08:31 6. Implementing DTOs (without AutoMapper) 12:14 7. Summary 23:27 AutoMapper tutorial: https://youtu.be/zGdmsuA0qdA #AspNetCore #dotnet #csharp

Видео Why do we use DTOs in our APIs? автора TypeScript и разработка API