Answer
DTOs decouple API contracts from internal entity models.
Benefits:
- Prevents over-posting
- Improves security
- Helps with API versioning
- Simplifies maintenance
Mapping can be done manually or using AutoMapper.
Quick Answer
DTOs (Data Transfer Objects) separate the API contract from domain entities. Input DTOs: define exactly what clients should send (prevent over-posting). Output DTOs: define exactly what clients receive (prevent leaking sensitive fields). DTOs are stable even when domain entities change. Use AutoMapper or manual mapping to convert. Never expose domain entities directly as API request/response models.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ