MERN stands for MongoDB, Express, React, Node, after the four key technologies that make up the stack.

• MongoDB — document database
• Express(.js) — Node.js web framework
• React(.js) — a client-side JavaScript framework
• Node(.js) — the premier JavaScript web server

Express.js and Node.js server tier

The next level down is the Express.js server-side framework, running inside a Node.js server. Express.js bills itself as a “fast, unopinionated, minimalist web framework for Node.js,” and that is indeed exactly what it is. Express.js has powerful models for URL routing (matching an incoming URL with a server function), and handling HTTP requests and responses.

By making XML HTTP Requests (XHRs) or GETs or POSTs from your React.js front end, you can connect to Express.js functions that power your application. Those functions, in turn, use MongoDB’s Node.js drivers, either via callbacks or using promises, to access and update data in your MongoDB database.

MongoDB database tier

If your application stores any data (user profiles, content, comments, uploads, events, etc.), then you’re going to want a database that’s just as easy to work with as React, Express, and Node.

That’s where MongoDB comes in: JSON documents created in your React.js front end can be sent to the Express.js server, where they can be processed and (assuming they’re valid) stored directly in MongoDB for later retrieval. Again, if you’re building in the cloud, you’ll want to look at Atlas. If you’re looking to set up your own MERN stack, read on!

Express and Node make up the middle (application) tier. Express.js is a server-side web framework, and Node.js is the popular and powerful JavaScript server platform. Regardless of which variant you choose

Very recently, I successfully completed the Mern Full Stack course organized by Icon IT Inc. I would like to thank Icon IT Inc (as an institution) for organizing such a wonderful training package.

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Really usefull training from Icon IT Inc.. Especially the Way they have organized the training was excellent with detailed materials and examples.