What is NestJS?

Nest (NestJS) is a framework for building efficient, scalable Node.js server-side applications. It uses progressive JavaScript, is built with and fully supports TypeScript (yet still enables developers to code in 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 robust HTTP Server frameworks like Express (the default) and optionally can be configured to use Fastify as well!

Nest provides a level of abstraction above these common Node.js frameworks (Express/Fastify), but also exposes their APIs directly to the developer. This gives developers the freedom to use the myriad of third-party modules which are available for the underlying platform.

GitHub: https://github.com/nestjs/nest

Philosophy of NestJS?

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, and 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, and loosely coupled and easily maintainable applications. The architecture is heavily inspired by Angular.

Features

MODULARITY

Streamline upkeep by organizing applications into self-contained modules.

SCALABILITY

Scale seamlessly with an efficient, battle-tested components.

DEPENDENCY INJECTION

Elevate testability with a sophisticated dependency injection system.

TYPE SAFETY

Mitigate errors through the robust type safety features of TypeScript.

RICH ECOSYSTEM

Explore a rich ecosystem offering versatile tools to craft solutions tailored to your needs.

ENTERPRISE-READY

Trusted by thousands of leading companies and organizations worldwide.

MICROSERVICES

Create loosely coupled, independently deployable services for increased agility and scalability.

WEB APPS

Build REST APIs, GraphQL APIs, Queues, and real-time & event-driven applications in no time.