NestJS has gained popularity as a robust framework for build scalable and efficient Node.js applications. In this guide, Let's explore the basics of NestJS, its architecture, and how Start developing with this powerful framework.
What is NestJS?
NestJS is a framework for Node.js that uses modern concepts development tools, such as Dependency Injection, Guidance Aspects and Programming Oriented to Decorators. It combines the power of TypeScript with the modularity of Angular, offering a Well-organized structure for backend development.
Why Choose NestJS?
Based on TypeScript: NestJS is fully written in TypeScript, which means you can enjoy all the advantages of this JavaScript superset, such as typing static and improved IntelliSense in code editors.
Modular Architecture: NestJS promotes a modular architecture, where each application functionality is encapsulated in modules. This makes it easier to organize the code and allows you to develop complex applications more structured and scalable.
Dependency Injection: The use of Injection Dependencies in NestJS make it easier to create components independent and reusable, reducing coupling between different parts of the application and making the code more testable and maintainable.
Support for Microservices:NestJS has native support for building microservices, using libraries like Nest Microservices, which facilitate communication between different services efficiently and securely.
How to Get Started with NestJS
To start developing with NestJS, follow these basic steps:
- NestJS Installation: Use the NestJS CLI To create a new project:
npm install -g @nestjs/cli
nest new meu-projeto-nest
cd my-project-nest
- Project Structure: NestJS organizes the project into modules, controllers and providers. The modules encapsulate related functionality, controllers handle HTTP requests and providers are responsible for the logic business and interaction with external services.
- Creating an Example:Let's create a simple HTTP endpoint for a list of users. First, create a module users
// users.module.ts
import { Module } from '@nestjs/common';
import { UsersController } from './users.controller';
@Module({
controllers: [UsersController],
})
export class UsersModule {}
- Creating a Controller: Now, create the controller users.controller.ts inside the directoryusers:
// users.controller.ts
import { Controller, Get } from '@nestjs/common';
@Controller('users')
export class UsersController {
@Get()
findAll(): string[] {
return ['João', 'Ricardo', 'Miranda'];
}
}
- Running the Application: To execute your NestJS application, use the command:
npm run start:dev
NestJS is an excellent choice for developers looking for a robust and modular framework for building Node.js applications scalable. With its module-based architecture, support for TypeScript and dependency injection, NestJS offers a way elegant way to develop high-quality APIs and microservices. I hope this guide has provided a clear and helpful introduction to NestJS. Start exploring this powerful framework and take your Development skills to the next level!