Project Structure

• src folder files

    app.controller.spec.ts
    app.controller.ts
    app.module.ts
    app.service.ts
    main.ts

• app.controller.ts - A basic controller with a single route.
• app.controller.spec.ts - The unit tests for the controller.
• app.module.ts - The root module of the application.
• app.service.ts - A basic service with a single method.
• main.ts - The entry file of the application which uses the core function NestFactory to create a Nest application instance.

main.ts file

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

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