Can you explain what the NestJS framework is and what it is used for?

NestJS is a progressive framework for building server-side applications with Node.js, built using TypeScript. It employs architectural patterns such as modularity, dependency injection, and controllers, inspired by Angular.

NestJS is designed for creating scalable, maintainable, and testable applications, including REST APIs, microservices, and GraphQL services.

Example of a simple controller in NestJS:

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

@Controller('hello')
export class HelloController {
  @Get()
  getHello(): string {
    return 'Hello, NestJS!';
  }
}