samchon/typia

Health v2 · maintenance only

Adoption not part of the score

5921 stars · 226 forks observed · 2026-09-27

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

Typia is a TypeScript transformer library that compiles pure TypeScript types into super-fast runtime validators, JSON serializers/parsers, JSON schemas, Protocol Buffer codecs, random data generators, and LLM function-calling schemas at build time. It requires no runtime reflection or separate schema definitions, claiming up to 20,000x faster validation than decorator-based alternatives.

Use cases

• validate api request bodies against typescript types
• generate schema from typescript interfaces
• build llm function calling tools with type-safe schemas
• fast serialization of typed objects
• validate and parse untrusted at runtime
• generate random mock data from typescript types
• encode and decode protobuf messages from typescript types
• validate llm structured output with detailed error feedback

When to choose

• you want runtime validation without duplicating types as schemas or decorators
• validation performance is critical in hot paths
• you need type-safe LLM function calling or structured output schemas
• you want JSON schema or protobuf generation derived directly from TypeScript types

When to avoid

• your project cannot adopt a TypeScript compiler transform like ttsc or ts-patch
• you need runtime validation in plain JavaScript without TypeScript
• you rely on tooling incompatible with custom transformers (some bundlers or ts-node setups)

Facets

library · maturity active

serialization testing llm-inference prompt-engineering data-generation developer-tools web-development large-language-models apis backend cross-platform runtime-validation -schema compile-time-transform protocol-buffers llm-function-calling type-safe structured-output random-data nodejs typescript

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