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” It guarantees that the “birthday” field contains an actual date, or that “zipcode” looks like a zipcode.It doesn’t guarantee set constraints, like username uniqueness.Before I get into different patterns, I like to make sure I understand the problem I'm trying to solve.In the above picture, from the external request perspective, I need a few questions answered: Think of request validation as "have I filled out the form correctly".Required property validation and the accompanying error messages are misplaced here inside the entity.These are simple things and don’t illustrate my point very strongly.A good place for validation logic definitely is the domain layer. NET mailing list in the past months was whether domain objects should be able to have an invalid state or not.This decision has naturally very strong implications on validation.

I don’t claim my conclusions to be best-practices or something like that. Going from top to bottom, here is what I would currently respond to those questions: I think it’s easier to answer this question with saying where it primarily should not be: In the Presentation Layer. Therefore it should reside in some lower or inner layer in my opinion.

The forms are coupled to the models, and there’s a grand unified validation layer.

This may be convenient at first, but it breaks down for larger systems, and creates headaches when having to support multiple clients.

I use domain-driven design, and one of the core patterns in DDD is the entity.

I won’t go into a description of aggregates or aggregate roots, but the entity is a central pattern when implementing domain-driven design.

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