description Node.js Overview
Built on Google's V8 engine, Node.js lets developers execute JavaScript outside a web browser, including on servers. Its event-driven approach and non-blocking input and output allow applications to handle network activity without waiting for each operation to finish before proceeding. That makes it relevant to web services and other applications that spend much of their time exchanging data. Full-stack JavaScript teams can use the same language across browser interfaces and backend code, though the two environments provide different APIs.
Enterprise applications also use Node.js, with production stability depending on version choice and sound engineering. Its architecture supports scalable network applications, but it does not guarantee speed: heavy computation can block the main event loop unless the work is handled appropriately.
help Node.js FAQ
What is Node.js used for?
Node.js lets developers run JavaScript outside the browser, most often for web servers, APIs, command-line tools, build systems, and real-time apps. It is built on Google's V8 JavaScript engine.
Is Node.js single-threaded?
Node.js runs JavaScript on a main event loop, which is why people describe it as single-threaded for application code. Under the hood, it also uses libuv and worker threads for tasks such as file I/O and some CPU work.
What is npm in the Node.js ecosystem?
npm is the package manager commonly installed with Node.js. It gives developers access to packages such as Express, React build tools, TypeScript tooling, and testing libraries.
How is Node.js different from browser JavaScript?
Browser JavaScript controls web pages through APIs like the DOM, while Node.js provides server-side APIs for files, networking, processes, and streams. The same language can be used, but the runtime environment is different.
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