React JS Tutorial for Beginners (2026): Complete Introduction, History & Installation Guide

What is React?


What is React?


React is a popular JavaScript library used to build user interfaces (UI) for websites and web applications. It helps developers create interactive, fast, and modern applications by breaking the user interface into small, reusable pieces called components.

Think about a shopping website. It contains a navigation bar, product cards, a shopping cart, a search box, and a footer. Instead of writing all of these sections as one large block of code, React allows you to build each part as a separate component. These components can then be reused wherever they are needed.

React focuses only on the user interface, which is the part of the application that users see and interact with. It works well with other libraries and tools for handling tasks such as routing, state management, and connecting to databases.

Today, React is one of the most widely used technologies for front-end web development because it makes building complex applications easier to manage and maintain.

History of React

React was created by Jordan Walke, a software engineer at Meta (formerly Facebook).

Before React was introduced, building interactive web applications was becoming increasingly difficult. As websites grew larger, updating the page after every user action often required refreshing the entire page or writing complex JavaScript code.

To solve this problem, Jordan Walke developed React in 2011 while working on Facebook. It was first used internally to improve the performance of Facebook's News Feed.

In 2013, Meta released React as an open-source project. This allowed developers around the world to use it, improve it, and contribute to its growth

React 

Year

Milestone

2011

React developed internally at Facebook

2013

Released as an open-source project

2015

React Native introduced for mobile app development

2017

Improved developer tools and performance

2019

React Hooks introduced, simplifying component logic

2022–2026

Continued improvements in performance, server rendering, and developer experience

What Do You Need Before Installing React?

React doesn't work by itself. It needs a development environment that helps compile your code, install packages, and run a local development server.

Before creating your first React application, install these tools:

  • Node.js – Runs JavaScript outside the browser.
  • npm (Node Package Manager) – Installs React and other libraries.
  • Visual Studio Code (VS Code) – A modern code editor for writing React applications.
  • Git (Optional but recommended) – Helps you manage code versions and upload projects to GitHub.
  • Vite – A modern build tool used to create React projects quickly.

  • React (Official Documentation): React Official Website
  • Node.js (LTS Download): Node.js Official Website
  • Visual Studio Code: Visual Studio Code
  • Git: Git Official Website

  • Vite (Official Documentation): Vite Official Website

    •  

    Why Do We Need Node.js?

    Node.js performs several important tasks:

    • Runs JavaScript outside the browser.
    • Installs React and third-party libraries.
    • Includes npm (Node Package Manager).
    • Starts the React development server.
    • Helps build and optimise applications for production.

    Think of Node.js as the engine that powers your React development environment.

    How to Install Node.js

    Installing Node.js is simple.

    1. Visit the official Node.js website.
    2. Download the LTS (Long-Term Support) version. This version is stable and recommended for beginners.
    3. Run the installer.
    4. Keep the default installation settings.
    5. Click Next until the installation finishes.
    6. Restart your computer if required.

    Once installed, Node.js and npm are ready to use.

    Check Whether Node.js Is Installed

    Open Command Prompt, PowerShell, or Terminal and type:

    node -v

    Example:

    v22.10.0

    If you see a version number, Node.js has been installed successfully.

    Check npm Version

    Now type:

    npm -v

    Example:

    10.9.0

    This confirms npm was installed automatically with Node.js.

    Step 2: Install Visual Studio Code (VS Code)

    What is VS Code?

    Visual Studio Code is one of the world's most popular code editors. It is lightweight, fast, free, and designed for modern web development.

    Most React developers use VS Code because it offers excellent support for JavaScript, React, HTML, CSS, Git, and many other technologies.

    Whether you're creating a small practice project or a large professional application, VS Code provides the tools needed to write clean and organised code.

    Best Practices for Beginners

    • Install the latest LTS version of Node.js.
    • Create new React projects using Vite.
    • Keep VS Code updated.
    • Install useful extensions.
    • Organise your files into folders.
    • Use meaningful component names.
    • Save your work regularly.
    • Practice by building small projects.
    • Learn one concept at a time.
    • Write clean and readable code.
    Interview Questions
    1. What is React?
    2. Why do we need Node.js for React?
    3. What is npm?
    4. What is Vite?
    5. What is the purpose of the src folder?

    Conclusion

    Setting up your React development environment is the first and most important step in your React journey. By installing Node.js, VS Code, Git, and creating a project with Vite, you build a strong foundation for learning modern frontend development.

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