Node.js

JavaScript runtime for server-side applications

nodejs.org

What is Node.js?

Node.js is an open-source JavaScript runtime built on Chrome's V8 engine. Node.js makes it possible to use JavaScript for server-side code, APIs and command-line tools. With its event-driven, non-blocking I/O model, Node.js is ideally suited for scalable network applications.

Why Node.js is useful

One language for frontend and backend — that is what makes Node.js so powerful:

  • Full-stack JavaScript: The same language for frontend and backend, less context-switching
  • npm ecosystem: The largest package registry in the world with 2+ million packages
  • Non-blocking I/O: Handle thousands of concurrent connections efficiently
  • Lightning-fast V8 engine: Just-in-time compilation for high performance

Time savings with Node.js

Node.js accelerates development by using one language for your entire stack. The vast npm ecosystem provides ready-made solutions for virtually any problem.

Express.js

Minimalist web framework for building APIs and web applications in just a few lines of code.

Worker Threads

Multi-threading for CPU-intensive tasks without blocking the event loop.

Streams

Process large files and data streams efficiently without loading everything into memory.

Built-in Test Runner

Native test framework since Node 18 — no external test libraries needed anymore.

Hidden features that often go unused

Node.js has many built-in features that developers often overlook:

  • Cluster Module: Use all CPU cores by running multiple Node processes.
  • AsyncLocalStorage: Pass context through async operations — ideal for request tracking.
  • WASI: WebAssembly System Interface for running performant native modules.
  • Diagnostics Channel: Built-in observability for monitoring and debugging.
  • Permission Model: Restrict file system, network and child process access per application.
  • Corepack: Manage package managers (npm, yarn, pnpm) without separate installation.

Integrations with other tools

Node.js integrates with many other tools and services:

Express.js Express.js MongoDB MongoDB TypeScript TypeScript
  • Express.js & Fastify: Popular frameworks for API and web development.
  • MongoDB & PostgreSQL: Native drivers for all popular databases.
  • TypeScript: Type-safe Node.js development for more robust applications.

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