MERN Stack — The best tech stack for your business.

What is the MERN stack?

MERN Stack Components- A Closer Look

MongoDB: A cross-platform document database


  • MongoDB environments are very scalable.
  • MongoDB can run over multiple servers. The data is duplicated to keep the system up and also keep its running condition in case of hardware failure.
  • It supports Master-Slave replication. MongoDB uses native applications to maintain multiple copies of data.
  • It supports MapReduce and flexible aggregation tools.
  • MongoDB JavaScript works well as the database uses the language instead of procedures.


  • MongoDB scales elastically in terms of data volume and throughput. The technology gives you enough flexibility across various data centers with good consistency.
  • The flexible data model with dynamic schema, and with powerful GUI and command-line tools, makes it fast for developers to build and evolve applications
  • MongoDB stores data in flexible JSON-like documents, which makes data persistence and combining easy.
  • Costs are significantly lowered as MongoDB runs on commodity hardware. The technology gives out on-demand, pay-as-you-go pricing with annual subscriptions, along with 24/7 global support.


  • MongoDB doesn’t support joins like a relational database. Yet one can use joins functionality by adding by coding it manually. But it may slow execution and affect performance.
  • MongoDB stores key names for each value pair. Also, due to no functionality of joins, there is data redundancy. This results in increasing the unnecessary usage of memory.
  • To achieve the performance and scalability, MongoDB ditches the transaction support. This makes MongoDB very easy to scale horizontally which utilizes much cheap hardware to balance the load.
  • It makes all the way easy to index documents
  • Ensure scalability as large data can be handled easily by dividing it into several machines
  • Schema Less as any type of data stored in a separate document
  • It’s really simple to set up a MongoDB environment
  • It supports a flexible document-model which is fast to create

Express: A back-end web application framework

  • Asynchronous and Single-threaded.
  • It is fast and scalable
  • It helps with code reusability using a built-in router.
  • Robust API

React: Library for building User interfaces


  • The virtual DOM is a lightweight copy of the original DOM. Includes all the properties of the real DOM.
  • Supports one-way data-binding which means that the data flows in one direction throughout the whole application. This gives better control over it.
  • ReactJS is component-based. Component logic is written in JavaScript rather than templates, so it is easy to pass the data through the app and keep the state out of the DOM.

React is the most loved web framework, with 74.5% of surveyed developers preferring to develop using it. The corresponding number for Angular is 57.6%, which places it in the 9th position. This report also found that in terms of popularity, React has overtaken Angular. While 31.3% of programmers preferred to React, the corresponding number for Angular is 30.7%.


  • Virtual DOM makes the user experience better and the developer’s work faster.
  • It relies on a virtual-DOM and re-render only what has really changed, hence better performance-wise
  • Helps tight binding of values or handling of local variables vs global variables
  • One-direction data flow provides a stable code


  • Integrating with some of the MVC frameworks would require one to be aware of what configuration changes to go through.
  • React technologies are updating and accelerating so fast that there is no time to write proper instruction. To solve this, developers write their own documentation for specific tools used by them in current projects.
  • It uses JSX. It’s a syntax extension, which allows mixing HTML with JavaScript. Developers and designers complain about JSX’s complexity and consequent steep learning curve.
  • The learning curve for the developers is quite high, ReactJS should not be the first one to start with for any new WEB developers
  • ReactJS supports Components that are basic building blocks of UI where each component has a logic. The components also support code reusability and make the web application easier to develop and understand.
  • Features like Virtual DOM, JSX, and Components make it much faster than the other frameworks.
  • React Native can easily code for Android and IOS apps using JavaScript and ReactJS.

Node.js: A JavaScript runtime environment


  • Being built on Google Chrome’s V8 JavaScript Engine, the Node.js library is very fast in code execution.
  • Node.js applications never buffer any data. These applications simply output the data in chunks.
  • All APIs of Node.js library are asynchronous, that is, non-blocking. It essentially means a Node.js-based server never waits for an API to return data.
  • Node.js uses a single-threaded model with event looping. The event mechanism helps the server to respond in a non-blocking way and makes the server highly scalable as opposed to traditional servers which create limited threads to handle requests.


  • Node.js is supported by the Google V8 engine which has the power to execute at the same time in the frontend using JavaScript.
  • It is open-source, friendly, and easy to use.
  • Node.js can help you use the web app and the server easily. This is because you have the same code which runs on the server-side end and as well as the same code which runs on the client-side.
  • Powerful server-side applications can be built with Node.js.


  • Node.js’s API or the application programming interface keeps changing continuously. It isn’t consistent at all.
  • Node.js makes you write everything from scratch. It might result in a decrease in productivity, slowing your work down.
  • Node.js doesn’t support multi-threaded programming yet. It is able to serve way more complicated applications than Ruby, but it’s not suitable for performing long-running calculations.
  • It supports open-source JavaScript Runtime Environment
  • It has a single-threaded model
  • Node.js has a fast code execution as it is built on Google Chrome’s JavaScript Engine
  • It is highly scalable

Advantages of MERN stack:

  • It includes the entire web development cycle from front-end development to back end development
  • It facilitates the MVC (Model View Controller) architecture that makes the web development process work smoothly
  • MERN is considered a cost-effective stack as with open-source support, accessible set-up, and reduced learning time, it may have the lowest development cost
  • With the JavaScript stack, developers only need to be proficient in JavaScript and JSON
  • The four robust technologies are feasible enough to develop a full-fledged software
  • The framework comes with a pre-built extensive suite of testing tools
  • MERN framework helps to build flexible and scalable websites
  • The four technologies provide smooth integration with cloud platforms

Why did Startups choose the MERN stack for development over MEAN?

Great community:

Full Stack:

MVC Architecture Support:

Low learning curve:

Pool Of Talent available:

Open Source:

Testing tools:

Last words



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