#Mern stack interview questions update
#Mern stack interview questions full
#Mern stack interview questions code

Our blog today will cover the same subject. What’s more important is to choose the right developers or a team, which is nothing less than a challenge.

#Mern stack interview questions full

To take full advantage of these technologies, it is imperative to employ a MERN stack developer.

But it changed over time with the introduction of the MERN stack, a combination of MongoDB, Express JS, ReactJS, and Node JS that is helping startups, SMBs, and legacy enterprises simplify the process of building applications. Asynchronous programming is more commonly used in Node.js because it allows for better performance and scalability.Ī: Middleware is a function that sits between the request and response objects in an Express.js application.Earlier, businesses only relied on technologies like HTML, CSS, and JavaScript to satisfy their web development requirements.

Q: What is the difference between synchronous and asynchronous programming in Node.js?Ī: Synchronous programming involves blocking the execution of the program until a task is complete, while asynchronous programming allows the program to continue executing while a task is being performed. Callbacks are used extensively in Node.js for asynchronous programming. Q: What is a callback function in Node.js?Ī: A callback function is a function that is passed as an argument to another function and is called when the other function has completed its task. HOCs are used to add features like data fetching, authentication, and logging to a component. Q: What is a higher-order component in React?Ī: A higher-order component (HOC) is a function that takes a component as its argument and returns a new component with additional functionality. This involves storing the form data in the component's state and updating it as the user interacts with the form.

#Mern stack interview questions update

Instead of directly updating the real DOM, React creates a virtual representation of the UI, which it can update more efficiently.Ī: Form data in React can be handled using the controlled component pattern. State is used to store data that can change over time, while props are used to pass data from a parent component to a child component.Ī: The virtual DOM is a concept in React that allows the library to optimize updates to the UI. Q: What is the difference between state and props in React?Ī: State and props are both used to store data in a React component, but they serve different purposes. It provides a predictable way to manage the state of your application, which makes it easier to debug and test.

#Mern stack interview questions code

It also provides features like code splitting and hot module replacement.Ī: Redux is a state management library for React. It also allows you to use features like JSX and ES6 modules.Ī: Webpack is a module bundler that allows you to bundle your JavaScript, CSS, and other assets into a single file. It allows you to combine HTML and JavaScript code in a single file.Ī: Babel is a tool that allows you to write modern JavaScript code and convert it to a version that is compatible with older browsers. It provides an event-driven, non-blocking I/O model, which makes it highly scalable.Ī: JSX is a syntax extension for JavaScript that allows you to write HTML-like code in your React components.

It provides a declarative approach to building components, which makes it easier to create complex UIs.Ī: Node.js is a JavaScript runtime environment that allows developers to run JavaScript on the server-side. It provides a set of features for building web applications, including routing, middleware, and templates.Ī: React.js is a JavaScript library for building user interfaces. It is highly scalable and provides features like indexing, replication, and sharding.Ī: Express.js is a web application framework for Node.js. It stands for MongoDB, Express.js, React.js, and Node.js.Ī: MongoDB is a document-based NoSQL database that is used to store data in a JSON-like format. A: MERN stack is a set of technologies that are used to develop web applications.