NestJS

NestJS is a progressive Node.js framework for building efficient, scalable server-side apps using TypeScript, inspired by Angular with modules, decorators, and DI.

It supports GraphQL, WebSockets, and microservices.

Use NestJS when:

• Structuring large Express/Fastify apps.
• Leveraging TypeScript for enterprise.
• Building microservices or APIs.
• Needing testing and validation built-in.

Note: Use @Module for organization.

Pipes for DTO validation.

e2e tests with supertest.