@nestjs/core

What is @nestjs/core?

The @nestjs/core package is the core foundation of the NestJS framework, a framework for building efficient, reliable and scalable server-side applications. It provides out-of-the-box application architecture which allows developers and teams to create highly testable, scalable, loosely coupled, and easily maintainable applications.

What are @nestjs/core's main functionalities?

Module System

NestJS uses a module system to organize code into separate modules. This code sample demonstrates how to define a basic module in NestJS.

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

@Module({
  imports: [],
  controllers: [],
  providers: [],
})
export class AppModule {}

Dependency Injection

NestJS provides a powerful dependency injection system, allowing classes to define their dependencies through the constructor. This code sample shows how to inject a service into another.

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

@Injectable()
export class MyService {
  constructor(private otherService: OtherService) {}
}

Controllers and Routing

NestJS allows for easy setup of controllers and routing. This code sample demonstrates defining a controller with a single route that returns a simple string.

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

@Controller('my-route')
export class MyController {
  @Get()
  getHello(): string {
    return 'Hello World!';
  }
}

Other packages similar to @nestjs/core

express

Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications. While it is less opinionated than NestJS, requiring more manual setup for structure and architecture, it serves as the underlying HTTP server framework for NestJS.

fastify

Fastify is a fast and low overhead web framework for Node.js. It is designed to be as efficient and fast as possible, similar to Express but with a focus on speed and performance. NestJS can use Fastify as an alternative HTTP server to Express, offering developers a choice based on their performance needs.

hapi

Hapi is a rich framework for building applications and services, offering a powerful plugin system. It is designed to be more configurable and extensible than Express, providing a robust set of features out of the box. While it shares some similarities with NestJS in terms of offering a structured approach to application development, it does not enforce a specific architecture or dependency injection system.

README

A progressive Node.js framework for building efficient and scalable server-side applications.

Description

Nest is a framework for building efficient, scalable Node.js server-side applications. It uses modern JavaScript, is built with TypeScript (preserves compatibility with pure JavaScript) and combines elements of OOP (Object Oriented Programming), FP (Functional Programming), and FRP (Functional Reactive Programming).

Under the hood, Nest makes use of Express, but also, provides compatibility with a wide range of other libraries, like e.g. Fastify, allowing for easy use of the myriad third-party plugins which are available.

Philosophy

In recent years, thanks to Node.js, JavaScript has become the “lingua franca” of the web for both front and backend applications, giving rise to awesome projects like Angular, React and Vue which improve developer productivity and enable the construction of fast, testable, extensible frontend applications. However, on the server-side, while there are a lot of superb libraries, helpers and tools for Node, none of them effectively solve the main problem - the architecture.

Nest aims to provide an application architecture out of the box which allows for effortless creation of highly testable, scalable, loosely coupled and easily maintainable applications. The architecture is heavily inspired by Angular.

Getting started

• To check out the guide, visit docs.nestjs.com. :books:
• 要查看中文 指南, 请访问 docs.nestjs.cn. :books:
• 가이드 문서는 docs.nestjs.com에서 확인하실 수 있습니다. :books:
• ガイドは docs.nestjs.comでご確認ください。 :books:

Questions

For questions and support please use the official Discord channel. The issue list of this repo is exclusively for bug reports and feature requests.

Issues

Please make sure to read the Issue Reporting Checklist before opening an issue. Issues not conforming to the guidelines may be closed immediately.

Consulting

With official support, you can get expert help straight from Nest core team. We provide dedicated technical support, migration strategies, advice on best practices (and design decisions), PR reviews, and team augmentation. Read more about support here.

Support

Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support from the amazing backers. If you'd like to join them, please read more here.

Principal Sponsors

Gold Sponsors

Silver Sponsors

Sponsors

Backers

Stay in touch

• Author - Kamil Myśliwiec
• Website - https://nestjs.com
• X - @nestframework

License

Nest is MIT licensed.