Learn The MERN Stack With The Top Free Resources


The terminology MERN stands for MongoDB, Express, React, Node which are the four main technologies that form a stack. MongoDB is the document database, Express (.js) is the framework of Node.js, React(.js) is the JavaScript framework that functions toward the client-side, and Node(.js) is the webserver for JavaScript. MERN is a part of the diverse identities present in the MEAN (MongoDB Express Angular Node) stack. It is in the MERN where React.js replaces the old frontend framework Angular.js. Firm owners can Hire Full Stack Developers to learn more about the MERN stack. 


API or application programming interface contains a set of protocols and definitions. APIs facilitate the development and integration of application software. The API is the assisting mediator between the user and the system. It helps to establish clear communication between the two. APIs help an organization in the sharing of information and resources regulating security, authentication, and control. API does not require caching specifics so the user does not have to worry about the source and process of resource retrieval.

REST is neither a standard nor a protocol but is an architectural constraint set. A client request over the RESTful API transfers the resource state representation to the endpoint or requester. The delivery format can include plain text, JSON, PHP, HTML, Python, or XLT. The language-agnostic JSON is readable by machines and humans. Therefore JSON is popular as a programming language. PHP or Hypertext Preprocessor is an interpreter and a scripting language that was used initially over Linux web servers. The original name for PHP stood as Personal Home Page Tools but now it’s called Hypertext Preprocessor. XLT is a template created from the spreadsheet application in Microsoft office called Microsoft Excel.         


MEAN stack application architecture consists of a REST (representational state transfer) API on a single page application. The design is made with MongoDB, Express, and Node.js where the SPA remains in-built to the Angular JS. REST API or RESTful API is an interface for application programming. It follows in line with the REST architectural style constraints and enables RESTful web service interaction.  

JSON or JavaScript Object Notation is a lightweight format that stores and transports data. The simple-to-understand, self-describing language is frequently used to transfer data from a server to a web page. MongoDB stores the data within documents with the JSON type. Express.js is the web application framework that uses the JavaScript language to help create variations over the server-side tools and applications. The front-end library React.js helps to develop user interfaces. The back-end runtime environment Node.js is a JavaScript that assists in JavaScript code execution outside the web browser.

The Functionality of The MERN Stack

Developers can use JSON and JavaScript to create a 3-tier design with the MERN architecture. The triple-tier construction consists of front-end, back-end, and database. 

The components are reusable independent code bits that share similar objectives with JavaScript. However, they operate in isolation as they return HTML over the function – render(). There are two kinds of components which are – Class components and Function components.   

  • Front End React.js

It is a JavaScript framework with which developers can create robust client-end applications within HTML. Developers can use simple Components to design complicated interfaces, connects them with the backend server data and later renders them in the form of HTML. The strength of React lies in its potential to use minimum code and effort to manage data-oriented stateful interfaces. Front End React.js also possesses error management, lists, forms, events, etc.

  • Server End Express.js and Node.js

The Node.js server has a server-side framework that runs within it known as Express.js. Express.js lives up to its identity as a non-opinionated fast and minimalist Node.js web framework. The Express.js contains efficient models to manage the requests and responses in HTTP and URL routing. The URL routing aims to match the incoming URL with a server activity. 

The POST method sends data toward a server to either create or update a resource. The data remain stored within the HTTP request body. The POST requests can neither be bookmarked nor are they cached. The request carries unrestricted data length and does not get collected in the browser history. 

The GET Method is a common HTTP method as it requests data from a specific resource. The GET requests can be cached and bookmarked. These requests contain lengthy restrictions and remain within the browser history. The GET requests are used only for requesting data but not to modify them. The request must not be put to use in handling sensitive data. 

The XHRs (or XML HTTP Requests) interact with the servers. Users do not have to refresh the entire page to retrieve the URL data. The XHR enables the Web page to update a portion of the page without disrupting the user’s work. XHRs can be used to obtain data, not only of XML but of any kind.      

Developers have to use the React.js front end to make POSTs or GETs or XHRs – XML HTTP Requests. Then they empower their applications by connecting to the Express.js functions. The Node.js drivers in MongoDB are used by these functions over callbacks to access and update data with Promises into the MongoDB database.

MongoDB is a document database that stores data within JSON-like documents. It is believed to be more effective and potent in comparison to the traditional row/column model. MongoDB is enriched with JSON documents to ensure effortless activities with data. It not only facilitates dynamic and flexible schemas but also supports values of nested objects and arrays. MongoDB has a powerful relational database that supports in-query joins and it possesses both embedded and reference relationships.     

  • Database Tier in MongoDB

    The simplified usability of Node, React and Express deserves an easy-to-use database to help the application store data. The data can include anything from user profiles, uploads, events, content, comments, etc. The MongoDB Database Tier stores the front-end React.js developed JSON documents. These documents are transferred to the Express.js server for processing and validation. Once verified, they are stored for future retrieval in MongoDB. 

MERN consists of MongoDB database tier, Express.js, and Node.js application tier, and React.js front-end display tier. With the 3-tier pattern in architecture, MERN is a full-stack solution.

What Are The Reaping Benefits Of The MERN Stack?

There are some advantages in using the MERN stack design that includes – 

  1. A single language facilitates the complete development of every web application from the front end to the back end.
  2. A vast open-source community develops and manages the MERN stack.
  3. Ensures swift and fluent development through a supportable MVC (model, view, and controller).
  4. The only language that the developer should be acquainted with is JavaScript language.
  5. Through a react-native library, the MERN stack helps in the development of any multiplatform mobile application. 

Learn MERN Stack With The Top Free Resources

  1. The Odin Project

Founded by Erik Trautman in the year 2013, the Odin Project is an open-source online programming course. The project offers a single destination for novice pupils to turn into full-stack web developers. The students can sharpen their programming skills with sufficient practice with a thousand hours of programming content. The pupil enrolls for the foundation course on every starting path. Post-completion of the foundation course, the student can choose to opt for full-stack with either JavaScript (MERN) or Ruby on Rails (RoR). The pupil can train for future collaborative development by learning version control with git in the two paths.

  1. Full Stack Open

The University of Helsinki provides this online course through the Department of Computer Science. Interested candidates can learn to use JavaScript to develop modern web applications through the Full Stack Open course. The purpose of this course is to teach students to use React.js in coding modern single-page applications. React.js consumes Node.js in-built REST APIs. The Full-Stack Open includes an alternative chapter to REST APIs called GraphQL. After students complete the course, they obtain a certificate.

  1. freeCodeCamp

The not-for-profit community “freeCodeCamp” was founded by Quincy Larson. At present, it is backed up by donations and maintained by an open-source community. freeCodeCamp enables learners to study code through building practical projects. The pupils learn as they read and complete challenges that involve interactive coding. There are multiple sections in which the code is divided. After completing every section, a pupil obtains a certificate. Candidates can streamline their full-stack web development career with the freeCodeCamp.

  1. Mozilla’s MDN Web Docs

Aspirants who wish to use MERN to get into full-stack development can use the Mozilla Developer Network’s learning resources. Although it is not a full-fledged course, yet, candidates can use it as an alternative learning material to learn about the MERN stack. Mozilla’s MDN Web Docs are designed and maintained by an online open-source community.

For further detailed information on the MERN stack, it is best advised to hire Nodejs Developers for their specialization and professional expertise in various JavaScript technologies with that they are highly professional to provide services in Web and Mobile app development. Most of the time clients got confused in between what to choose from company or freelancers but for the best result, you should go with the company.


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