NestJS is a framework for building efficient and scalable Node.js server-side applications built with and fully supported by TypeScript. It uses robust HTTP Server frameworks like Express or Fastify. Nest provides a level of abstraction above common Node.js frameworks and exposes its APIs to the developer. This gives a great amount of freedom to use third-party modules.
A good reason to choose NestJS over ExpressJS (one of the most popular Node.js frameworks) is the fact that when a new project in Node.js is started it is a clear architecture based on a few simple components (controllers, modules and providers). This gives great ease to split applications into microservices.
Are you wondering why choose NestJS as your backend framework? Keep reading.
What is NestJS?
As mentioned, NestJS is an open-source, extensible, versatile, progressive Node.js framework for creating compelling and demanding backend systems. It is currently the fastest-growing Node.js framework in TypeScript.
NestJS is used for writing scalable, testable and loosely coupled applications. It brings scalable Node.js servers to a whole new level. It supports databases like PostgreSQL, MongoDB, MySQL. NestJS is heavily influenced by Angular, React and Vue and offers dependency injection right out of the box.
As of January 2022, it has over 44k GitHub stars and its weekly npm download rate is almost 180k. It encourages developers to try, learn and use some well-known software development paradigms and its documentation has lots of examples, recipes and code sources.
Building blocks of NestJS
Modules: used to organize the code and split features into logical reusable units. Grouped TypeScript files are decorated with “@Module” decorator which provides metadata that Nest makes use of to organize the application structure.
Providers: also called services, which are designed to abstract any form of complexity and logic. Providers can be created and injected into controllers or other providers.
Controllers: responsible for handling incoming requests and returning appropriate responses to the client-side of the application (for example call to the API).
Incredible features of NestJS
Recently, the NestJS framework has been gaining extreme popularity due to its incredible features. Some of them are:
- Easy to use, learn and master
- Powerful Command Line Interface (CLI) to boost productivity and ease of development
- Detailed and well-maintained documentation
- Active codebase development and maintenance
- It is open-source (MIT license)
- Support for dozens of nest-specific modules that help you easily integrate with common technologies and concepts like TypeORM, Mongoose, GraphQL, Logging, Validation, Caching, WebSockets and much more
- Easy unit-testing applications
- Created for Monoliths and Micro-services (an entire section in the documentation regarding Microservice types of NestJS applications as well as techniques and recipes
Why choose NestJS
- A quick and efficient development process.
- Highly scalable and easy to maintain applications.
- Fastest growing Node.js framework for the past 3 years.
- Large community and support system.
- Nest has positioned itself at a unique crossroad of front end and mid-tier development that many languages have struggled to find.
- Great documentation.
- Easy unit testing.
- Built for large-scale enterprise applications.
- Nest provides an out of the box application architecture that allows developers and teams to create highly testable, scalable, loosely coupled and easily maintainable applications.
- With NestJS you can build Rest API’s, MVC applications, microservices, GraphQL applications, Web Sockets or CLI’s and CRON jobs.
- It uses the best of Node.js, TypeScript, and bullet-proof architectural patterns.
- The structure of the application in Nest is heavily based on Angular. The structure is very simple and allows more attention to be paid to the design of endpoints and their consumers, instead of the application structure.
- NestJS forces developers to use a specific architecture by introducing Angular-like modules, services, and controllers, ensuring the application is scalable, highly testable, and loosely coupled contrary to other Node.js frameworks like Express or Koa where a mistake early on in the project regarding the architecture may cost a lot in terms of time spent refactoring the codebase later.