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Node.js is a powerful, open-source, server-side JavaScript runtime environment built on Chrome’s V8 JavaScript engine. It enables developers to build scalable, high-performance network applications, such as web servers, APIs, microservices, and real-time applications. Leveraging an event-driven, non-blocking I/O model, Node.js excels at handling concurrent connections efficiently.

Audience

This tutorial is designed for software developers, students, and enthusiasts who want to learn the fundamentals of Node.js and its core concepts. Whether you’re new to backend development or transitioning from another language, this guide provides a step-by-step introduction with clear explanations and practical examples.

Prerequisites

Before starting this tutorial, you should have a solid understanding of JavaScript fundamentals, including variables, data types, functions, objects, arrays, and asynchronous programming concepts (callbacks are helpful, Promises and async/await knowledge is beneficial). Familiarity with basic web concepts (HTTP, HTML, CSS) and command-line usage will also be advantageous.

Execute Node.js Online

Many examples in this tutorial can be tested quickly using online Node.js environments like Replit, CodeSandbox, or the official Node.js REPL available on their website. These platforms allow you to run code snippets directly in your browser without local setup.

Try the classic “Hello World!” example in an online environment or your local Node.js setup:

// Hello World! program in Node.js
console.log("Hello World!");

Running this code using node your_file_name.js or in a REPL will print “Hello World!” to the console.

A PDF version of this tutorial might be available for offline reading. Check the main tutorial page for download links.