NestJS

NestJS is the backend framework for TypeScript developers who miss having structure. Decorators, dependency injection, modules, guards, interceptors — it's Angular's architecture applied to server-side Node.js. Opinionated in the way that saves you from making bad decisions.

If you're building a non-trivial API and Express feels like building with no guardrails, NestJS provides the architecture. Express is the minimal baseline. Fastify is faster but equally unopinionated. Hono is the new lightweight contender. AdonisJS is the other full-featured option. Spring Boot is the Java equivalent NestJS clearly borrowed from.

Best for teams building production APIs who want conventions, not chaos. The module system and DI container make large codebases manageable. TypeScript support is first-class — it was built for it.

The catch: the decorator-heavy style is love-it-or-hate-it. The abstraction layers add overhead — both mental and runtime. Simple APIs feel over-engineered in NestJS. And if you're a solo founder building fast, Express + a few libraries might get you to MVP quicker than learning NestJS's patterns.