nestia: what it is, what problem it solves & why it's gaining traction

What it solves

Nestia is a set of helper libraries for NestJS that streamlines the development of typed API servers and their corresponding client SDKs. It solves the problem of manual SDK generation, slow runtime validation, and the repetitive boilerplate of maintaining synchronized types between backend and frontend.

How it works

Nestia uses pure TypeScript types to automatically generate high-performance runtime validators, Swagger documentation, and typed fetch functions for clients. It replaces slow libraries like class-validator and class-transformer with significantly faster alternatives, providing a performance boost of up to 30x overall.

Who it’s for

Backend developers using NestJS who want to increase development speed and a highly typed, tRPC-like experience for their frontend clients, as well as teams needing high-performance JSON serialization and validation.

Highlights

• High Performance: Runtime validation is 20,000x faster than class-validator and JSON serialization is 200x faster than class-transformer.
• Automated SDKs: Automatically generates a collection of typed fetch functions and DTO structures for clients.
• AI Integration: Includes @agentica for LLM function calling and @autobe for generating NestJS applications via "vibe coding."
• Developer Tools: Provides a Mockup Simulator for client applications, an E2E test function generator, and a Swagger-UI with an online TypeScript editor.