NestJS

NestJS is an opinionated Node.js framework for building scalable server-side applications, first released in 2017. It is written in TypeScript and takes strong architectural inspiration from Angular — using decorators (@Controller, @Injectable, @Module) and dependency injection to organise code into clearly defined, testable units. For teams coming from Spring (Java) or Angular backgrounds, the patterns are immediately familiar.

The core building blocks are modules (logical groupings of features), controllers (route handlers), and providers / services (business logic classes injected into controllers via the DI container). Pipes validate and transform incoming data; guards implement authentication and authorization; interceptors transform responses and handle cross-cutting concerns like logging and caching.

NestJS runs on top of Express by default, or Fastify as a higher-performance alternative. The official package ecosystem covers every common need: @nestjs/graphql (Apollo or Mercurius), @nestjs/typeorm and @nestjs/mongoose for database access, @nestjs/microservices for message queue integrations (RabbitMQ, Kafka, Redis), and @nestjs/schedule for cron jobs. Over 65,000 GitHub stars.