what is mern stack

There are several prominent technology stacks that you can undertake in web development, and one of them is the MERN stack. It is an abbreviation for MongoDB, Express.js, React.js, and Node.js. I’m sure you’ve heard of its counterpart — MEAN Stack, and we talked exclusively about it here. In Fact, if you’re just beginning your web development journey, you can decide follow any of these two path, that means you will have to read through to see which one will be a good fit for you.

This article will look at the MERN stack’s components and how they work together to construct powerful web apps.

Mongo DB

MongoDB is a document-oriented database that uses JSON-like documents to store data. It is a NoSQL database, which implies that it does not follow the usual tabular relational database structure. Instead, it employs a flexible, schema-free data format that makes it simple for developers to store and retrieve data.

MongoDB used in web development because it is scalable, versatile, and simple to use. It functions well with distributed systems and can manage massive volumes of data. MongoDB also supports a wide variety of data types, such as arrays, nested documents, and geographical data.

Express JS

Express.js is a popular Node.js web application framework. It provides a suite of tools for rapidly and simply developing web apps and APIs. Express.js makes it easier to create RESTful APIs and handle HTTP requests and answers.

Express.js is well-known for its modularity and versatility. It operates with a variety of middleware modules and extends the capabilities of web applications. Middleware modules handle cookies, parse incoming data, and authenticate users.

React JS

React.js creates user interfaces and reusable interface components. It is used in web development because it provides a quick and effective approach to refresh the user interface in response to changes in application state.

To create user interfaces, React.js use a component-based method. This implies that each component is in charge of a different aspect of the user interface, and the components may be reused across the programme. React.js also makes use of a virtual DOM, which allows it to change the UI without having to re-render the entire page.

Node JS

Node.js is a JavaScript runtime environment that runs on the server. It enables developers to utilise JavaScript on the server side of a web application, making code sharing between the client and server simple. Node.js is well-known for its scalability and speed, and it is frequently used in web development for real-time applications and APIs.

Node.js has a number of built-in modules for activities including file input/output, networking, and cryptography. It also contains a package manager called npm, which makes installing and managing other modules simple.

Working Together

When used together, the components of the MERN stack provide a powerful platform for building web applications. Here’s how they work together:

  • MongoDB is a database for storing data. It provides a flexible data model that makes it easy to store and retrieve data in a way that is natural for developers.
  • Express.js is a web application framework. It provides a set of tools for building web applications and APIs quickly and easily.
  • React.js builds the user interface. It provides a fast and efficient way to update the UI in response to changes in the application state.
  • Node.js is the server-side runtime environment. It allows developers to use JavaScript on the server side of a web application and provides a range of built-in modules for handling tasks such as file input/output and networking.

Benefits of Using MERN Stack

One of the primary advantages of adopting the MERN stack is that it allows developers to use JavaScript throughout the web application stack. This means they can create code once and have it work on both the client and server sides of the application. It also implies that they will be able to reuse code more readily, which will save time and effort throughout the development process.

Here are other benefits that the MERN stack provide:

  1. Efficiency: One of the biggest advantages of the MERN stack is its efficiency. By using a single language (JavaScript) throughout the entire stack, developers can write code more quickly and easily. They can also reuse code more easily, which can save time and effort in the development process.
  2. Flexibility: The MERN stack is flexible and modular by design. Each component (MongoDB, Express.js, React.js, and Node.js) can be used independently or together. This means that developers can choose the components that best meet their needs and can build customized applications according to requirements.
  3. Scalability: The MERN stack is designed to be scalable. MongoDB is known for its ability to handle large amounts of data, while Node.js is known for its speed and scalability. This means that developers can build applications that can handle large amounts of traffic and data.
  4. Real-time applications: Node.js is to build real-time applications. It can handle multiple connections at the same time and can push data to clients in real-time. This makes it ideal for applications that require real-time updates, such as chat applications or online gaming.
  5. Easy to learn: JavaScript is one of the most popular programming languages in the world, which means that many developers are already familiar with it. This makes it easy for developers to learn the MERN stack and start building applications quickly.
  6. Large developer community: The MERN stack has a large and active developer community. This means that developers can find answers to their questions and support when they need it. It also means that there are many resources (such as tutorials, documentation, and libraries) available to help developers build applications more easily.
  7. Open-source: MERN stack components are all open-source. This makes them free to use, modify and distributed by anyone. This makes it easy for developers to use and customize according to their needs.


In summary, the MERN stack offers a range of benefits to developers who are building web applications. It is efficient, flexible, scalable, and well-suited for building real-time applications. It is also easy to learn, has a large developer community, and is open-source. If you’re looking to build a web application, the MERN stack is definitely worth considering.

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