MERN
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.
Course Features
What is a technology stack?
The technology stack is a set of frameworks and tools used to develop a software product. This set of frameworks and tools are very specifically chosen to work together in creating a well-functioning software.
Here are some examples of widely used web development technology stacks in use today:
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- MERN (MongoDB, ExpressJS, ReactJS, NodeJS)
- LAMP (Linux, Apache, MySQL, PHP)
- MEAN (MongoDB, ExpressJS, AngularJS, NodeJS)
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MongoDB:
A document-oriented, No-SQL database used to store the application data.
NodeJS:
The JavaScript runtime environment. It is used to run JavaScript on a machine rather than in a browser.
ReactJS:
A library created by Facebook. It is used to build UI components that create the user interface of the single page web application.
ExpressJS:
A framework layered on top of NodeJS, used to build the backend of a site using NodeJS functions and structures. Since NodeJS was not developed to make websites but rather run JavaScript on a machine, ExpressJS was developed.
JavaScript
JavaScript (often shortened to JS) is a lightweight, interpreted,
Next.js
Next.js is a React framework that gives you building blocks to create web applications. By framework, we mean Next.js handles the tooling and configuration needed for React, and provides additional structure, features, and optimizations for your application.
GitHub
GitHub is a code hosting platform for version control and collaboration. It lets you and others work together on projects from anywhere. This tutorial teaches you GitHub essentials like repositories, branches, commits, and pull requests.
HTML/CSS
HTML (the Hypertext Markup Language) and CSS (Cascading Style Sheets) are two of the core technologies for building Web pages. HTML provides the structure of the page, CSS the (visual and aural) layout, for a variety of devices.
We give you access to video tutorials of your class.
We provide a pdf book for an assignment
We provide users to build complete websites or apps.
I.Q.A.
MERN Stack Interview Questions and Answers
What is the MERN stack?
The MERN stack is a web development stack that is based on the JavaScript programming language. It is made up of four main components: MongoDB, Express, React, and Node.js. Together, these four components provide a powerful and flexible way to build web applications.
How does the MERN stack differ from other stacks like MEAN, LAMP, LEMP, and Ruby on Rails?
The MERN stack is a JavaScript-based stack that includes MongoDB, Express, React, and Node.js. MEAN is a similar stack that uses Angular instead of React, while LAMP and LEMP are traditional stacks that use Linux, Apache, MySQL, and PHP/Perl/Python. Ruby on Rails is a web application framework written in Ruby. The main difference between the MERN stack and these other stacks is that the MERN stack uses JavaScript throughout the entire stack, while the others use a mix of languages.
Can you explain what a REST API is in context with the MERN stack?
A REST API is an application programming interface that uses HTTP requests to GET, PUT, POST and DELETE data. It is often used in conjunction with the MERN stack, as the MERN stack includes a MongoDB database which can be easily accessed and manipulated using a REST API.
What are the key advantages of using MongoDB over MySQL or PostgreSQL?
MongoDB is a powerful document-oriented database system that offers many advantages over traditional relational database management systems such as MySQL or PostgreSQL. MongoDB is highly scalable and can be easily shared to support large-scale data processing. It also has a rich query language that makes it easy to work with data stored in MongoDB. Additionally, MongoDB offers built-in replication and high availability, making it a great choice for mission-critical applications.
What’s the difference between ReactJS and Angular?
ReactJS is a JavaScript library for building user interfaces, while Angular is a full-fledged framework. ReactJS is just a view layer, so you need to use additional libraries to get a complete framework. Angular comes with everything you need out of the box, including a router, HTTP client, and form handling. ReactJS is also faster and more lightweight than Angular.
Why do people prefer to use Redux instead of Flux?
Redux is a more popular option for managing state in React applications for a few reasons. First, Redux offers a single, immutable state object that is easy to update and use. This is in contrast to Flux, which uses a mutable state object. Second, Redux provides a clear and concise way to write action creators and reducers, making code easier to read and understand. Finally, Redux comes with a number of useful tools, such as the Redux DevTools extension, that make debugging and development easier.
What are some important ES2015 features that are useful when working with the MERN stack?
Some important ES2015 features that are useful when working with the MERN stack include arrow functions, classes, template literals, and destructuring. Arrow functions are helpful for concisely writing anonymous functions, classes provide a more traditional object-oriented programming approach, template literals make it easy to interpolate variables into strings, and destructuring can simplify working with complex data structures.
How would you go about creating a simple backend application using the MERN stack?
The MERN stack is a JavaScript-based stack for building web applications that include MongoDB, Express, React, and Node.js. To create a simple backend application using the MERN stack, you would first need to install MongoDB and create a MongoDB database. Next, you would need to install the Express web framework. After that, you would need to install React and create a React component. Finally, you would need to install Node.js and create a Node.js server.
How would you connect your react app to mongo db?
There are a few different ways to connect a React app to MongoDB, but the most common way is to use the MongoDB Node.js driver. This will allow you to use MongoDB within your React app by creating a connection to the database and then using that connection to perform CRUD operations.
If a client asks you to develop a shopping cart app for their e-commerce site, which tools in the MERN stack will you use to start building it?
I would use React for the front-end, Node.js for the back-end, and MongoDB for the database.
What do you understand by server-side rendering versus client-side rendering? Which one is better and why?
Server-side rendering is when the server generates the HTML for a page and sends it to the client. Client-side rendering is when the client generates the HTML for a page. Server-side rendering is generally considered to be better because it is more efficient and can provide a better user experience.