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What is MERN stack

What is MERN stack

đź‘‹ Introduction

MERN is a powerful, popular and widely used tech stack.

MERN is an acronym for MongoDB, Express.js, React.js, and Node.js.

Using these languages together lets you build web and mobile applications.

Entirely using one language, JavaScript.

The MERN stack is an end-to-end tech stack.

It covers Frontend, Backend, and Database.

The languages used in MERN are open-source.

MERN uses a 3 tier architecture which covers the layers of client (Frontend), server (Backend) and database.

What is MERN?

The MERN stack has four main developing languages:

M: MongoDB

E: Express.js

R: React.js

N: Node.js 

React is used for Frontend.

Express and Node are used for the Backend.

MongoDB is used as the database program.

You can create full-stack applications with MERN using only JavaScript and JSON. 

Want to learn JavaScript? Try our course

How the MERN stack works

The stack is separated into three main components. Frontend, Backend, and database. 

How MERN works

Frontend: React.js

React is a JavaScript library for building user interfaces.

React is used to build single-page applications.

React allows us to create reusable UI components.

Want to get started with React? Try our course


Backend (1/2): Express.js

Express is a web application framework for Node.js.

It makes writing backend code easier.

Primarily used to build Web Applications and APIs.

It is free and open-source.


Backend (2/2):  Node.js

Node.js is an open-source server environment.

Node.js allows you to run JavaScript on the server.

Want to get started with Node.js? Try our tutorial


Database: MongoDB

MongoDB is a widely used document-oriented database program.

It uses NoSQL.

MongoDB is open-source.

It is well suited for cloud computing.

Want to become a web developer? Try our guide

MERN stack benefits

  • Reducing the time to develop and deploy web applications.
  • Reduced server costs.
  • Better performance.
  • Open source
  • Everything is written in JavaScript. Which makes it fast and easy to switch between client and server.

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Ajay Kumar - August 7, 2022

easy understanding and very effective
loved it!!

saeid khoday - July 27, 2022


Joshua Chapman - July 26, 2022

Never thought I would ever read a blog and find value from it.
That changed with the w3 schools blog! Nice work.

Asad Ullah - July 26, 2022

That’s awesome explanation

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