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NestJS is a progressive Node.js framework that uses TypeScript by default and is heavily inspired by Angular. This framework combines the best of front-end and back-end technologies. NestJS provides an out-of-the-box application architecture with a modular structure, which makes it easy to organize code into reusable modules. The framework integrates with other libraries to provide an end-to-end development experience. It's designed to be highly testable with built-in testing utilities for unit and integration tests, allowing developers to write clean code using industry-leading practices without sacrificing performance or flexibility through its support for traditional RESTful APIs as well as GraphQL through built-in compatibility with Apollo Server.