Service Injection Example - Nestjs Typing CST Test

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Service Injection Example — Nestjs Code

Demonstrates dependency injection of a service into a controller.

import { Injectable, Controller, Get, Module } from '@nestjs/common';
import { NestFactory } from '@nestjs/core';

@Injectable()
class HelloService { getMessage() { return 'Hello from Service'; } }

@Controller()
class AppController {
	constructor(private readonly helloService: HelloService) {}
	@Get() hello() { return { message: this.helloService.getMessage() }; }
}

@Module({ controllers: [AppController], providers: [HelloService] })
class AppModule {}

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

Nestjs Language Guide

NestJS is a progressive Node.js framework for building efficient, scalable, and maintainable server-side applications using TypeScript and modern JavaScript.

Primary Use Cases

▸Building RESTful APIs and GraphQL services
▸Creating microservices with built-in support
▸Developing server-side applications with TypeScript
▸Implementing real-time WebSocket applications
▸Building enterprise-grade backend systems

Notable Features

▸TypeScript-first design
▸Modular architecture
▸Dependency Injection container
▸Support for REST, GraphQL, WebSockets, and microservices
▸Built-in testing and CLI tools

Origin & Creator

NestJS was created by Kamil Myśliwiec in 2017 to provide a structured framework for building maintainable Node.js server-side applications with TypeScript.

Industrial Note

NestJS is popular in enterprise backend ecosystems and microservice architectures, providing scalable, modular, and maintainable server-side solutions.

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Service Injection Example — Nestjs Code

Demonstrates dependency injection of a service into a controller.

import { Injectable, Controller, Get, Module } from '@nestjs/common'; import { NestFactory } from '@nestjs/core'; @Injectable() class HelloService { getMessage() { return 'Hello from Service'; } } @Controller() class AppController { constructor(private readonly helloService: HelloService) {} @Get() hello() { return { message: this.helloService.getMessage() }; } } @Module({ controllers: [AppController], providers: [HelloService] }) class AppModule {} async function bootstrap() { const app = await NestFactory.create(AppModule); await app.listen(3000); } bootstrap();

Nestjs Language Guide

NestJS is a progressive Node.js framework for building efficient, scalable, and maintainable server-side applications using TypeScript and modern JavaScript.

Primary Use Cases

▸Building RESTful APIs and GraphQL services
▸Creating microservices with built-in support
▸Developing server-side applications with TypeScript
▸Implementing real-time WebSocket applications
▸Building enterprise-grade backend systems

Notable Features

▸TypeScript-first design
▸Modular architecture
▸Dependency Injection container
▸Support for REST, GraphQL, WebSockets, and microservices
▸Built-in testing and CLI tools

Origin & Creator

NestJS was created by Kamil Myśliwiec in 2017 to provide a structured framework for building maintainable Node.js server-side applications with TypeScript.

Industrial Note

NestJS is popular in enterprise backend ecosystems and microservice architectures, providing scalable, modular, and maintainable server-side solutions.