typestack/class-transformer

Health v2 · maintenance only

Adoption not part of the score

7339 stars · 527 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

class-transformer is a TypeScript/JavaScript library that transforms plain objects into class instances and back using decorators. It supports serialization, deserialization, exposing/skipping properties, versioning, and groups for controlling output.

Use cases

• convert plain JSON objects into typed class instances
• serialize class instances to plain objects for API responses
• deserialize API payloads into class instances with nested types
• exclude or rename properties during serialization
• convert date strings into Date objects on deserialization
• expose getters and method return values in serialized output

When to choose

• you use TypeScript classes and want type-safe instances from plain objects
• you need fine-grained control over which properties are serialized
• you work with nested object graphs and need automatic type conversion
• you want decorator-based transformation on both frontend and backend

When to avoid

• you only need simple JSON.stringify/parse without class instances
• your project uses plain interfaces and types instead of classes
• you need schema validation rather than transformation (use class-validator or zod)
• you avoid experimental/legacy decorators in your build setup

Facets

library · maturity stable

serialization middleware developer-tools web-development backend frontend browser cross-platform typescript decorators deserialization plain-objects class-instances data-transformation nodejs

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