scalalandio/chimney

Health v2 · maintenance only

Adoption not part of the score

1254 stars · 113 forks observed · 2026-09-03

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

Chimney is a battle-tested Scala library for boilerplate-free, type-safe data transformations between case classes and other types. It uses macro-based derivation to automatically generate conversion code, supporting Scala 2.13 and 3 across JVM, Scala.js, and Scala Native.

Use cases

• convert between case classes without writing boilerplate
• map DTOs to domain objects in Scala
• automatically derive type-safe object transformations
• patch and update immutable data structures
• migrate between versions of a data model
• reduce manual mapping code in Scala applications

When to choose

• you need type-safe, compile-time-checked transformations in Scala
• you want to eliminate manual field-by-field mapping code
• you need cross-platform support (JVM, Scala.js, Scala Native)
• you want a mature library with production adopters

When to avoid

• you are not using Scala
• you need runtime-configurable (dynamic) mapping rather than compile-time derivation
• your transformations involve complex runtime logic macros cannot express

Facets

library · maturity stable

serialization developer-tools plugin-system developer-tools programming-languages jvm cross-platform scala data-transformation boilerplate-free type-safe macro-derivation object-mapping scala-native scala-js scala-3 metaprogramming automation

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