NestJS Installation ও Project Structure

# global install
npm install -g @nestjs/cli

# নতুন project
nest new my-nest-app

# project-এ ঢুকুন
cd my-nest-app

# dev server চালু
npm run start:dev

# output: Nest application successfully started

my-nest-app/
├── src/
│   ├── main.ts             # bootstrap — app start
│   ├── app.module.ts       # root module
│   ├── app.controller.ts   # basic controller
│   ├── app.service.ts      # basic provider/service
│   └── app.controller.spec.ts  # unit test
├── test/                   # e2e tests
├── nest-cli.json           # CLI config
├── package.json
├── tsconfig.json
└── .eslintrc.js

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();

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

@Module({
  imports: [],       // other modules
  controllers: [AppController],  // routes
  providers: [AppService],       // services
})
export class AppModule {}

# useful CLI commands
nest g module users     # new module
nest g controller users # controller
nest g service users    # service
nest g resource products # full CRUD resource
nest g class user/dto/create-user.dto --no-spec