Node.js

Node.js is an open-source, cross-platform JavaScript runtime environment governed by the OpenJS Foundation. Built on Google’s V8 JavaScript engine, Node.js enables developers to execute JavaScript code outside a web browser to build web applications, network servers, command-line interfaces (CLIs), background services, and automation scripts.

Asynchronous Architecture & Core Libraries

Node.js utilizes an event-driven, non-blocking asynchronous I/O architecture designed for high-concurrency network applications. Its runtime operates on a single-threaded event loop that offloads network and file system operations to system kernel threads, while providing multi-threading capabilities via worker threads (node:worker_threads) for CPU-intensive operations.

The runtime includes a built-in standard library providing core modules for application development:

• HTTP & Networking: Web server instantiation (node:http) and socket streaming (node:stream).
• File System & Streams: Asynchronous file reading, writing, and streaming pipelines (node:fs).
• Cryptography & Security: Hashing, cipher encryption, and certificate management (node:crypto).
• Native Testing: Built-in test runner framework (node:test) and assertion utilities (node:assert).

Package Ecosystem & Release Lifecycle

Node.js supports both ES Modules (.mjs) and CommonJS (.cjs) module standards and integrates with the Node Package Manager (npm) registry to manage third-party software dependencies. The project maintains an active release lifecycle consisting of Current releases, even-numbered Long-Term Support (LTS) versions, and defined end-of-life (EOL) windows with security patch schedules managed by the OpenJS Foundation security team.