NestJS Introduction

NestJS is a progressive Node.js framework for building efficient, scalable, enterprise-grade server-side apps in TypeScript. It brings structure and proven architecture to Node.

Structure over freedom

Where Express hands you a blank canvas, Nest gives you a clear architecture out of the box: modules, controllers, and providers, wired together by built-in dependency injection. Everyone's Nest app looks familiar.

The building blocks

TypeScript & decorators

Nest is TypeScript-first and uses decorators (@Controller, @Injectable, @Get) to declare intent — an approach borrowed from Angular. It runs on Express by default (or Fastify).

@Controller('users')
export class UsersController {
  @Get()
  findAll() { return this.service.findAll(); }
}

When to choose Nest

• Larger apps and teams that benefit from consistent structure.
• Projects wanting DI, testability, and clear separation by default.
• TypeScript codebases — Nest embraces types fully.
• For tiny services or maximum flexibility, plain Express may be simpler.