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NestJS

NestJS is a structured Node.js framework for building scalable backend applications.

What Is NestJS​

NestJS uses TypeScript, decorators, modules, controllers, services, and dependency injection.

It is often used for APIs, microservices, and backend systems that benefit from a strong architecture.

How To Use NestJS​

Use the Nest CLI to create modules, controllers, and services, then connect them through dependency injection.

Basic Example​

import {Controller, Get} from '@nestjs/common';

@Controller('health')
export class HealthController {
  @Get()
  check() {
    return {ok: true};
  }
}

Common Concepts​

  • Modules group features.
  • Controllers handle requests.
  • Providers hold business logic.
  • Guards and interceptors customize request flow.

What To Learn Next​

Learn modules, providers, validation pipes, authentication, databases, testing, and microservices.