Tim-Maes/Facet

Health v2 · maintenance only

Adoption not part of the score

1204 stars · 52 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Facet is a C# source generator that eliminates DTO boilerplate by generating DTO types, constructors, LINQ projections, and reverse mappings from domain models at compile time. It supports classes, records, structs, nested mapping, custom mapping configurations, and preserves XML docs and validation attributes with zero runtime overhead.

Use cases

• generate DTOs from domain models without boilerplate
• create LINQ projections for efficient database queries
• map domain models to API response models
• exclude sensitive fields from public API models
• generate reverse mappings from DTOs back to domain models
• create admin and public views of the same entity

When to choose

• you write lots of manual DTO and mapping code in C#/.NET
• you want compile-time generation with zero runtime reflection overhead
• you need multiple projections of the same domain model for different audiences
• you use EF Core and want efficient query projections

When to avoid

• you are not on the .NET/C# ecosystem
• you prefer runtime mapping libraries like AutoMapper with dynamic configuration
• your project does not use source generators or Roslyn

Facets

library · maturity active

serialization developer-tools backend web-development developer-tools dotnet cross-platform source-generator dto object-mapping linq-projection compile-time csharp boilerplate-elimination

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