https://docs.nestjs.com/

• Install Global CLI ( Command Line Interface )- npm i -g @nestjs/cli
• since we Installed cli we can create nestjs project using -
• Next we have to select the package Manager

• Done 🎊 - our setup is ready now.
• Intial folder structure

• main.ts → Root File ( Entry Point ) - creates a Instance of NestJS

import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';

async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  await app.listen(process.env.PORT ?? 3000);
}
bootstrap();

• app.module.ts → Connects all the Submodules

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';

@Module({
  imports: [],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}

• app.controller.ts → Handles Requests and Responses

import { Controller, Get } from '@nestjs/common';
import { AppService } from './app.service';

@Controller()
export class AppController {
  constructor(private readonly appService: AppService) {}

  @Get()
  getHello(): string {
    return this.appService.getHello();
  }
}

• app.service.ts → Place where we write our logics

import { Injectable } from '@nestjs/common';

@Injectable()
export class AppService {
  getHello(): string {
    return 'Hello World!';
  }
}

• Now lets dive into them one by one by creating small project
• NestCLI Is Very Powerful - so let’s start
• create a new module, controller and service with name hello