BIS601 FSD - MERN Stack and how it works

 Components of MERN Stack

Component	Role	Description
MongoDB	Database	A NoSQL document-based database that stores data in JSON-like BSON format. Used to persist application data.
Express.js	Web Framework	A lightweight Node.js web application framework used to build RESTful APIs and handle backend routing, middleware, and server logic.
React.js	Frontend Library	A JavaScript library developed by Facebook for building dynamic and responsive user interfaces using a component-based architecture.
Node.js	Runtime Environment	A JavaScript runtime built on Chrome's V8 engine that allows running JavaScript on the server-side. Hosts the Express backend.

How They Work Together (Flow)

1. React.js – Handles the frontend: displays UI and sends user requests (e.g., form submission).
   
   

2. Express.js – Receives requests from React via HTTP (usually using fetch or axios), handles routes.
   
   

3. Node.js – Runs the server and integrates Express.
   
   

4. MongoDB – Stores and retrieves data requested by Express, which is then sent back to React.