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Node.js

Node.js is the JavaScript runtime that brought JS to the server side, enabling the same language to power both frontend and backend. It's become the dominant platform for building APIs, microservices, real-time applications, and developer tools — and it's one of the most widely deployed server runtimes in the world.

What is Node.js?

Node.js is built on Chrome's V8 engine with a non-blocking, event-driven I/O model that makes it exceptionally performant for I/O-heavy workloads. The npm ecosystem is the world's largest package registry. Key frameworks include Express.js, Fastify, Koa, and NestJS. Node.js powers everything from RESTful APIs and GraphQL servers to WebSocket applications, BFF (Backend for Frontend) layers, and serverless functions.

Why Node.js matters for your career

Node.js allows JavaScript/TypeScript developers to build full-stack applications without switching languages. Its performance for concurrent I/O, massive npm ecosystem, and seamless integration with JavaScript-based tooling make it a natural choice for web-first companies. Node.js engineers who also know TypeScript are exceptionally in demand.

Career paths using Node.js

Node.js skills open roles as Backend Developer, Full-Stack Developer, Node.js Engineer, Platform Engineer, and API Developer. NestJS experience is increasingly listed as a specific requirement for enterprise Node.js roles.

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Frequently asked questions

Is Node.js good for CPU-intensive tasks?▼

Not inherently — Node.js's single-threaded event loop is optimised for I/O, not CPU-bound work. For CPU-intensive tasks, use Worker Threads, offload to Rust/Go microservices, or use C++ native addons. Most web applications are I/O-bound, so this limitation rarely matters.

What's the difference between Node.js and Deno/Bun?▼

Deno (from Node's creator, Ryan Dahl) adds TypeScript support, security sandboxing, and a curated standard library. Bun is a high-performance alternative with a fast runtime and bundler. Node.js remains dominant but Bun is gaining rapid adoption for its speed improvements.

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Related tools

TypeScriptExpress.jsJavaScriptReactMongoDBPostgreSQLPrismaDockerGraphQLGit

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