Fundamentals of NestJs Framework

Nest Js

NestJS is a powerful, scalable Node.js framework that’s built on top of Express. It’s designed to provide a robust architecture for building efficient, maintainable, and scalable server-side applications. NestJS is built with TypeScript, which is a superset of JavaScript that provides features such as static typing and enhanced object-oriented programming capabilities. This blog will explore the features of NestJS and how it can be used to develop enterprise-grade applications.

Architecture and features

NestJS is based on the modular architecture pattern, which allows developers to create reusable code and organize their applications into logical modules. The framework provides a set of core modules that can be used to handle common tasks such as routing, validation, and authentication. Developers can also create their own custom modules to handle specific tasks.

NestJS provides a range of features that make it easy to develop robust applications. Here are some of the key features:

Dependency injection

NestJS uses dependency injection to manage the creation and lifecycle of objects. This allows developers to easily create and manage complex object graphs, making it easier to write scalable and maintainable applications.

Middleware

NestJS supports middleware, which can be used to add functionality to an application’s request/response cycle. Middleware can be used for tasks such as logging, error handling, and authentication.

Controllers

NestJS provides a controller layer that’s responsible for handling incoming HTTP requests and returning responses. Controllers can be used to define the routes for an application and the logic that’s executed when a request is received.

Providers

Providers are a key feature of NestJS that are used to manage the creation and lifecycle of objects. Providers can be used to define services, repositories, factories, and other types of objects that are used in an application.

Pipes

Pipes are a feature of NestJS that are used to transform incoming data before it’s processed by a controller. Pipes can be used for tasks such as data validation, sanitization, and transformation.

Guards

Guards are a feature of NestJS that are used to control access to resources based on certain conditions. Guards can be used for tasks such as authentication, authorization, and rate limiting.

Getting started with NestJS

To get started with NestJS, you’ll need to have Node.js and npm installed on your system. You can install NestJS using npm by running the following command:

npm i -g @nestjs/cli

This will install the NestJS CLI, which you can use to create a new NestJS application. You can create a new application by running the following command:

nest new my-app

This will create a new NestJS application in the my-app directory. You can start the application by running the following command:

cd my-app
npm run start

This will start the application on http://localhost:3000.

Conclusion

NestJS is a powerful Node.js framework that provides a robust architecture for building efficient, maintainable, and scalable server-side applications. The framework’s modular architecture, dependency injection, middleware, controllers, providers, pipes, and guards make it easy to develop complex applications with ease. Whether you’re building a small microservice or a large enterprise-grade application, NestJS is a great choice.

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