NestJS

Progressive Node.js framework for building efficient, scalable server-side applications. Uses TypeScript by default and combines object-oriented, functional, and reactive patterns. Provides an abstraction over Express or Fastify while exposing their APIs directly for third-party integrations.

Trusted by enterprises such as Microsoft, Red Hat, Mercedes-Benz, and Netlify. Nest brings Angular-style architecture to the Node.js backend: modular design, dependency injection, and out-of-the-box structure that Express lacks. MIT-licensed open source with a rich ecosystem of official packages and community modules.

Key features:

• Modular architecture with self-contained modules for maintainable codebases
• Dependency injection for testability and loose coupling
• Built-in support for REST APIs, GraphQL, WebSockets, and microservices
• Optional Fastify adapter for higher throughput
• Nest CLI for scaffolding and DevTools for dependency visualization

Teams use Nest for REST and GraphQL backends, real-time apps, event-driven services, and microservice architectures. Works with TypeORM, Prisma, Mongoose, and other data layers. Integrates with OpenAPI, validation libraries, and testing frameworks.