Server-Side Application Development with Nest.js

Overview

In the dynamic environment of server-side application development, Nest.js has become an important framework that attracts the attention of developers due to its flexibility, extensibility, and control. Nest.js arises from the strong foundation of Express.js and seamlessly integrates quality with the Angular-inspired elegance model. This combination, combined with the power of TypeScript, has brought Nest.js to the forefront of modern web development.

Introduction

Nest.js is a framework. This is a revolution in the way developers build server-side applications. Its design is reminiscent of Angular and provides familiar patterns that support code organization and enhance the experience.

The experience is further enhanced with the popular language TypeScript, which offers the benefits of traditional typing for a cleaner, more secure experience.

Nest.js Features

The foundation of Nest.js lies in the success of its main features. Modularization makes creating individual and reusable components easier, while dependency injection makes these components easier to manage. Decorators are powerful tools for making declarations inherited from TypeScript, and intermediate objects and pipelines provide a simple way to handle requests and responses. Nest.js also integrates with GraphQL, opening the door to high-performance API development.

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Understanding Nest.js

Nest.js is a framework for building modular, scalable, and manageable server-side applications. It is based on Express.js and takes inspiration from Angular using its patterns and models. Nest.js leverages TypeScript, a statically typed superset of JavaScript, to help keep code organized, improve development and tooling.

Key Features of Nest.js:

Modularization: Node.js supports a modular architecture, encouraging modules to organize and encapsulate code.
Injection Prevention: Use injection prevention to manage objects and their dependencies easily.
Decorators: Decorators are widely used to define modules, controllers, programs, and other components to make the code base clean and attractive.
Middleware and Pipelines: Middleware and pipelines provide a simple way to process requests and responses.
Middleware and Pipelines: Middleware and pipelines provide a simple way to process requests and responses.
GraphQL support: Nest.js and GraphQL support the creation of modern high-performance APIs.

Getting started with Nest.js

Installation:

Use the following command to start a new Nest.js project:

npm install - g @ Nestjs/cli
Nest new my-nest –application

1 2	npm install - g @ Nestjs/cli Nest new my-nest –application

Structure:

Nest.js projects have a predefined structure that includes modules, controllers, programs, and other components. These standards help develop policies and maintain sanitation.

Create a module:

Use the Nest CLI to create a new module:

nestgenerate module my-module

1	nestgenerate module my-module

Create the controller:

Create the controller in the module:

nest program code to create the controller i-module

1	nest program code to create the controller i-module

Add a new service:

Create a service in the module:

nestgenerate service my-service

1	nestgenerate service my-service

Make an app:

Start Nest. js application:

start npm run

1	start npm run

Real-life example for creating a task management API

Let’s create a simple task management API using Nest.js. We will have projects where we will work with managers and services to manage the projects.

Create a Task Module:

nest generate module tasks

1	nest generate module tasks

Generate a Controller:

nest generate controller tasks

1	nest generate controller tasks

Create a Service:

nest generate service tasks

1	nest generate service tasks

Define Task Model:

// tasks/task.model.ts
export class Task {
  id: string;
  title: string;
  description: string;
  completed: boolean;
}

// tasks/task.model.ts

export class Task {

id: string;

title: string;

description: string;

completed: boolean;

}

Implement Controller and Service Logic:

// tasks/tasks.controller.ts
import { Controller, Get } from '@nestjs/common';
import { TasksService } from './tasks.service';
 
@Controller('tasks')
export class TasksController {
  constructor(private readonly tasksService: TasksService) {}
 
  @Get()
  getAllTasks() {
    return this.tasksService.getAllTasks();
  }
}
typescript
Copy code
// tasks/tasks.service.ts
import { Injectable } from '@nestjs/common';
import { Task } from './task.model';
 
@Injectable()
export class TasksService {
  private tasks: Task[] = [];
 
  getAllTasks(): Task[] {
    return this.tasks;
  }
}

// tasks/tasks.controller.ts

import { Controller, Get } from '@nestjs/common';

import { TasksService } from './tasks.service';

@Controller('tasks')

export class TasksController {

constructor(private readonly tasksService: TasksService) {}

@Get()

getAllTasks() {

return this.tasksService.getAllTasks();

}

typescript

Copy code

// tasks/tasks.service.ts

import { Injectable } from '@nestjs/common';

import { Task } from './task.model';

@Injectable()

export class TasksService {

private tasks: Task[] = [];

getAllTasks(): Task[] {

return this.tasks;

}

Run the Application:

npm run start

1	npm run start

You have now initiated and completed simple API management tasks using Nest.js. Explore additional features and extend the app based on your specific usage.

Conclusion

Nest.js simplifies server-side application development by providing a framework and design framework. By understanding its main features and following the steps to create a simple application, developers can leverage the power of Nest.js to create large, manageable, cost-effective solutions.

Drop a query if you have any questions regarding Nest.js and we will get back to you quickly.

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FAQs

1. What is Nest.js, and how is it different from other Node.js frameworks?

ANS: – Nest.js is an advanced Node.js framework designed for building and managing server-side applications. It stands out because it uses the framework created by Angular, leverages TypeScript to enhance development, and provides features such as dependency injection and decoration.

2. Why should I choose Nest.js for my project?

ANS: – Nest.js makes it easy to structure and maintain code by providing structure and structure. It uses TypeScript to ensure type safety and reduce the possibility of errors. Additionally, Nest.js has Angular experience, making it a good choice for developers with experience in the Angular framework.

3. Does TypeScript need to be used to use Nest.js?

ANS: – Yes, Nest.js is built on TypeScript. Although TypeScript is not required, it is recommended that you take advantage of Nest.js features, including static typing, customization, and developer tools.