Mapster is a code generator that automatically creates object-to-object mapping methods for C# applications.
The tool solves the problem of writing repetitive mapping code between domain objects, data transfer objects, and other types. Rather than manually implementing mapping logic, Mapster generates optimized mapping methods at compile time using code generation. This approach eliminates boilerplate while producing performant mapping code tailored to your specific type conversions.
Mapster suits projects that perform frequent object transformations, particularly those using layered architectures with DTOs, Entity Framework integration, or dependency injection patterns. The tool provides specialized packages for common scenarios: integration with Entity Framework Core and EF6, support for immutable types, JSON.NET compatibility, and dependency injection container setup. Teams should adopt it when mapping code represents a significant portion of their codebase or when performance of mapping operations matters. The README does not compare Mapster to alternative mapping libraries.
The project maintains active development with regular updates to its core packages and ecosystem. The tool receives ongoing refinement across its multiple specialized packages, indicating sustained investment in supporting diverse mapping scenarios. Documentation and tooling support remain current, with diagnostic packages available to help developers understand and debug generated mapping code.
