How to validate API on next.js + prisma2?

Question

API

There is a project on next.js and prisma.js . What is the best way to implement API validation? the problem is - I already described the entity schema in prisme, but in order to use validation, for example, using YUP, you need to describe the same schema again. Maybe I don't see any means that next.js and prisma provide to do this without code repetition? I don't want to change my plans twice.

Tell me where to dig who has experience.