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JavaScript and TypeScript are programming languages widely used in web development, with Node.js enabling server-side execution. When combined with frameworks like Express and NestJS, they allow developers to build robust, scalable backend systems and full-stack applications.

TypeScript extends JavaScript by adding static typing, improving code quality and maintainability, especially in large projects. Node.js provides the runtime environment, while Express offers a minimalist framework for building APIs and web servers. NestJS is a more structured, Angular-inspired framework that leverages TypeScript and supports modern design patterns such as dependency injection and modular architecture.

Develop and maintain RESTful APIs and microservices
Implement server-side logic using Express or NestJS
Write type-safe code with TypeScript and Node.js
Integrate with databases like MongoDB, PostgreSQL, or Redis
Use middleware, routing, and authentication strategies
Follow best practices for security, testing, and performance

This skill is commonly required in roles such as Backend Developer, Full-Stack Developer, and Node.js Engineer, particularly in tech companies, startups, and digital agencies. Employers expect practitioners to understand asynchronous programming, error handling, and the Node.js event loop, as well as familiarity with package managers like npm or yarn and tools like Jest for testing. Knowledge of modern JavaScript (ES6+) and design patterns like MVC or services is essential. Professionals with this skill set often work on cloud-based platforms and use DevOps practices including CI/CD pipelines and containerization with Docker.

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