What is MEAN Stack ?

MEAN Stack refers to a combination of technologies; they are MongoDB, Express.js, Angular and Node.js, respectively. MEAN Stack is open-source, based on JavaScript. Programmers use these technologies, or we can say, MEAN Stack, to develop web applications. They can also use it to develop hybrid mobile applications rapidly. Here we will discuss briefly technologies comprising the MEAN Stack:

MongoDB Database: It is the database part of the MEAN stack. Angular.js is a front-end used to gather the information which is sent to the Express.js server. Express.js server then processes the information, which later is stored in the database MongoDB for later purposes. 

Express.js and Node.js Server: Next letter, E in MEAN, stands for Express.js. It is a fast and simple web framework for Node.js which provides a runtime system for JavaScript on the back-end of web applications. Express.js has a good command over handling HTTP requests and responses and URL routing.

Angular.js front end: 

Though in between in the word MEAN, we can say it is the top layer of the Stack. JavaScript framework that helps to extend HTML tags with metadata. This is for creating interactive and powerful web applications.

In Mean Stack whole code is JavaScript. MEAN Stack developers need to master the use of JavaScript and JSON. So, it becomes easy for beginners to explore and learn. Also, its use reduces the development time and cost.

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What is MERN Stack?

MERN also falls in the category of Full-Stack. MERN is representing the technologies Mongo DB, Express.js, React and Node.js. This includes frameworks, databases and runtime environments based on JavaScript. So, it is a package for the end-to-end development of applications. This package can also be used to develop web applications and hybrid mobile applications. 


React.js makes up the top layer of the MERN Stack. It is a declarative JavaScript framework used for creating client-side applications. It helps to develop complex interfaces through simple components. It then connects them to data at the back-end server and reduces that to HTML. It helps to build complex scenarios with minimum code. It makes the developments easier. Coding done with React can be used both on browsers and servers.

Express.js and Node.js Server:

Again, the letter E in MERN stands for Express.js. It is the framework on the server-side which runs inside a Node.js server. Node.js provides a runtime system for JavaScript. Express.js has very efficient functionalities for both URL routing and handling HTTP requests and responses. The requests from React.js connect to Express.js functions, which uses Node.js drivers to access and update data in the MongoDB database.

The Database level MongoDB: 

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As the name itself indicates, MongoDB is the database that stores the data gathered from the front-end application. JSON documents created in React.js front-end are sent to the Express.js server. At this level, they are processed and stored in MongoDB for later uses.

MEAN Stack Vs MERN Stack

We have looked at some of the prominent characteristics of MEAN Stack and MERN Stack; let’s discuss some of the major differences:

  1. With React.js being a library, MERN provides a flawless user interface. Angular.js is also capable of providing smooth interfaces. Here, developing an application with MEAN, the database and UI code has an intermediate layer between, which eases the management and up-gradation of the code. Thus, the base code remains untouched. Angular is constantly evolving with new versions. React is a library that helps programmers to develop code faster
  2. Considering the productivity, Angular in the MEAN stack is more productive than react. Angular also has the “Command-line Interface,” which makes it easier for developers to manage and upgrade the code. React itself being a library requires a combination with Third-Party libraries to provide required functionalities of up-gradation and management of the code, which reduces its productivity.
  3. To complete the requirement of large-scale application development, third-party libraries are used. Though Angular is a framework, it provides features to include third-party libraries and make the code unified. Despite being a library, React needs extra libraries to support the extended configurations. 
  4. React has rich documentation than angular, which makes it easier to learn. Node.js, Mongo.js, Express.js have good documentation of the functionalities, but Angular is a framework that works on typescript and templates, making it complicated than library React.
  5. In the MERN stack, the data flow is unidirectional; that is, the developer can change the data, but first, the data submitted to the database through the server is changed, and then the user interface is changed. This process is suitable for large-scale projects. But Angular technology is suitable for small-scale projects. Here the approach is bidirectional. The change in UI is accompanied with the change in Model state.  Learn AngularJS with Industry experts at AngularJS Online Course at 3RI Technologies. We provide practical oriented Mean Stack and MERN Stack training.

Some similarities between MEAN stack and MERN stack:

  1. Both of them have Model View Controller architecture to make the development process easy
  2. The components in the Stack: like MongoDB is a well-equipped database, Node.js in both the stacks facilitates to develop toughest back-end applications with the JavaScript executing on the server part. Express.js handles HTTP requests, routes the functions and produces an application interface.
  3. Both MEAN, and MERN stack technologically have front-end development and back-end development using JavaScript.
  4. Both are easy to implement and flexible to use for developers.
  5. Both the stacks have an embedded exclusive set of testing tools and documentation making developers easy to learn.

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