NestJS — progressive Node.js framework

NestJS is a framework for building efficient, scalable server-side Node.js applications. It is TypeScript-first (works with plain JS too), heavily modular, and built around dependency injection. Under the hood it runs on a pluggable HTTP platform — Express (default, @nestjs/platform-express) or Fastify (@nestjs/platform-fastify) — and the same building blocks also power GraphQL, WebSocket, and microservice apps. Its architecture is heavily inspired by Angular: decorators + DI + modules.

This skill is a faithful offline copy of the official NestJS documentation. The narrative below is the map; open the matching file under references/ for exact APIs, options, and full detail. Start navigation at references/CONTENTS.md. Targets NestJS v11; the live docs are at https://docs.nestjs.com.

Mental model — three building blocks