Начальная настройка и установка зависимостей.

src/app.controller.ts

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+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();
+	}
+}

src/app.module.ts

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+import { Module } from "@nestjs/common";
+import { AppController } from "./app.controller";
+import { AppService } from "./app.service";
+
+@Module({
+	imports: [],
+	controllers: [AppController],
+	providers: [AppService],
+})
+export class AppModule {}

src/app.service.ts

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+import { Injectable } from "@nestjs/common";
+
+@Injectable()
+export class AppService {
+	getHello(): string {
+		return "Hello World!";
+	}
+}

src/main.ts

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+import { NestFactory } from "@nestjs/core";
+import { AppModule } from "./app.module";
+
+async function bootstrap() {
+	const app = await NestFactory.create(AppModule);
+	await app.listen(3000);
+}
+
+bootstrap().then();