React JS Introduction + Setup | Learn React Step-by-Step | MERN Stack Series
Welcome back to Code Simplifier!
This is the first video of our MERN Stack Series, and today we begin with ReactJS.
In this video, you will understand what ReactJS is, why it is used, and how to install React on your system using Vite.
🚀 What You Will Learn in This Video
🔹 What is ReactJS?
React is a JavaScript library used to build modern UIs
Created by Facebook (Meta)
Works on a component-based architecture
Helps create reusable UI components
Supports fast rendering using the Virtual DOM
🔹 Why Use React?
Reusable components
Faster UI updates
Works with Virtual DOM (updates only the necessary parts)
Easy state management
Huge ecosystem
Widely used in modern web development
A part of many full-stack technologies including the MERN stack
🛠️ React Installation (Using Vite)
In this video, you will see:
Prerequisites: Node.js and NPM
Visiting the official Vite website: vitejs.dev
Following the documentation
Running the setup command:
npm create vite@latest
Choosing:
Project Name
Framework → React
Variant → JavaScript
Installing dependencies
Starting the development server
Understanding basic project files:
src/App.jsx
index.html
📌 Key Concepts Explained
JSX and how React uses it
How React renders UI
Why React is called a Single Page Application (SPA)
Role of the main HTML file and components
⏱️ Video Chapters
00:00 – Introduction
00:03 – What is ReactJS?
00:44 – Why React uses Virtual DOM
01:21 – React ecosystem & role in full-stack development
01:40 – How to install React with Vite
02:03 – Creating React project in VS Code
02:44 – Installing Node modules & project setup
03:31 – Understanding App.jsx and JSX
04:00 – How React renders Single Page Applications
04:10 – Summary & next video info
📚 Next Video
In the next part, we will begin building a basic React website and explore components in detail.
Stay tuned and subscribe to follow the complete MERN Stack Series!
🔗 Useful Links
React Docs — https://react.dev
Vite Docs — https://vitejs.dev
Node.js Download — https://nodejs.org
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Channel: Code Simplifier
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