Typia

Typia is a TypeScript library that generates runtime validators, serializers, and schemas from types.

Typia is a TypeScript library that generates runtime validators, JSON schemas, and LLM function calling utilities directly from TypeScript types. It operates at compile time to build fast validation and serialization functions. The library includes features for runtime validation, enhanced JSON stringification, random data generation, and Protocol Buffer encoding. It supports integrations with tools like Vercel AI SDK, LangChain, NestJS, and OpenAI. Developers use it to ensure type safety during runtime operations and data exchanges.

Typia at a glance

Best for: Software engineer
Runs on: CLI
Pricing: Free
Released: March 2025
Category: AI coding tool
Website: typia.io

Key features

Generate runtime validators from TypeScript types
Stringify and parse JSON with enhanced performance
Generate JSON Schema for OpenAI structured outputs
Create LLM function calling applications
Encode and decode Protocol Buffer messages
Generate random mock data from types
Integrate with Vercel AI SDK and LangChain

Use it for

Validating runtime data against TypeScript types
Generating JSON schemas for OpenAI structured outputs
Encoding and decoding Protocol Buffer messages
Building LLM function calling workflows

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