Next.js Interview Questions

If you are looking for some best Next.js interview questions, then you are in the right place. We have compiled a list of the best Next.js interview Questions, that will surely help you crack the interview. Read on and All the Best!

Most frequently asked Next.js Interview Questions Mention a few features of Next.js Why should anyone choose Next.js? How can AMP be verified in Next.js? What is the suggested approach for Next.js data fetching? List a few advantages of Next.js Is static CDN supported by Next.js? Is JS more difficult than React? Is it possible to learn Next.js without React?

Next.js Interview Questions

Ans: An open-source, compact React.js framework called Next.js makes it easier for programmers to create static and server-side rendering web applications. Zeit came up with it. We can quickly create server-rendered React apps thanks to the Next.js framework, which is built on React, Webpack, and Babel. Your next feature-rich web application can be built with just npm run dev start and without any webpack settings.

Q2) Mention a few features of Next.js

Ans: 

• JS offers simple server rendering by default.
• Static exporting is supported in JS.
• It offers a Webpack-based development environment that facilitates the use of hot module replacement (HMR)
• Automatic code-splitting is supported for quicker page loading.
• It supports straightforward file system-based routing as well as client-side routing (page-based).
• It offers total control over Webpack and Babel.
• It offers a more efficient and quick development compilation.
• You can use Express or another Node.js HTTP server to implement it.
• With your own Babel and Webpack configurations, you may quickly change it.
• It allows for instant code reloading.

Q3) What categories of websites utilize Next.js the most?

Ans: The most common uses for Next.js, a React JS framework, are to create the following apps and websites:

• Static Websites
• PC-based websites
• SEO-friendly websites
• Server Rendered Apps

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Q4) Why should anyone choose Next.js?

Ans:

•  Zero Setup: Routing based on filesystems, hot code reloading, and universal rendering are all automatic.
• Completely customizable: Total command over Webpack and Babel. Server, routing, and next-plugin customization options.
• Production-Ready: Reduced build size optimization, quicker dev compilation, and other enhancements.

Q5) Does Create React App do the same function as Next.js?

Ans: In essence, Create-React-App is React with a built-in build system. So it serves as a useful boilerplate. Just to run React, we don't need to worry about setting up Webpack, Babel, or other dependent packages. Other than that, we must build packages on top of Create-React-App if we need additional functions like routing, server-side rendering, and so forth.

A whole stack React framework is Next.js. It is pre-loaded with useful features including effective routing, build system, API routing, server-side rendering, and many others that perform well in a production context.

Q6) How can AMP be verified in Next.js?

Ans: 'amp HTML-validator' is used during development to validate your AMP pages. When Next.js is launched, a terminal will show any warnings and fatal errors. The "next export" process validates AMP pages as well, and if improper AMP validation is present, errors will be reported in the terminal and the "next export" will fail.

Q7) How may AMP be enabled in Next.js?

Ans: There are two methods for turning on AMP in Next.js.

• AMP – First Pages: Both the website's regular visitors and search engine visitors are given access to these. To implement AMP-first pages, the following syntax must be used.
• Hybrid AMP Pages: In order for search engines to quickly display the AMP version of the page in various mobile search results, hybrid AMP pages let users have an AMP version of a standard page alongside it.

Q8) What is the suggested approach for Next.js data fetching?

Ans: There are many ways to fetch data in Next.js but the framework itself suggests using the async function getInitialProps to fetch data from any location. The context object that getInitialProps obtains when we use it to retrieve data has the features shown below:

• Pathname: This identifies the URL's path portion.
• Query: It is used to define the URL query string portion of an object-parsed URL.
• asPath: This defines the string that represents the actual path that the browser displays, along with the query.
• Req: The HTTP request object (server only) is specified using the word "req.”
• Res: The HTTP response object (server only) is specified by the prefix res.
• Err: If a rendering error occurs, the word "err" is used to specify the error object.

Q9) What does Next.js's code splitting mean, in your opinion?

Ans: In general, code splitting is one of Webpack's most alluring features. This feature makes it easier for us to divide our code into different bundles that can only be loaded in parallel or on demand. This primarily serves to create smaller bundles and makes it easier to manage resource load prioritization, both of which have a significant impact on load time.

Code splitting primarily uses three methods:

• Entry Points: Manual entry configuration is used to separate code.
• Eliminate Duplication: Deduplication and chunk splitting are done using Entry dependencies or SplitChunksPlugin.
• Adaptive Imports: Using inline function calls within modules, it divides the code using dynamic imports.

It is primarily used to allow unneeded code to load on pages that can never do so.

Q10) List a few advantages of Next.js

Ans:

• Simple project creation, modification, and needed package discovery.
• Optimum application performance because automatic code-splitting is available.
• With the use of prefetching, Next.js enables efficient code bundles to be loaded slowly in the background.
• It enables SSR, or server-side rendering, in application code, providing SEO-friendly flexibility, an initial render to application view, and doing away with the need to download code.
• Hot-Module Replacement that works with robust error reporting.

Q11) What does Next.js's Styled JSX mean?

Ans: It is a library for writing scoped and encapsulated CSS that is used by developers to style Next.js components. Developers can add, remove, and modify styles without being concerned about unintended consequences thanks to Styled JSX, which prevents styles from being introduced to one component from affecting other components.

Q12) What are the advantages of utilizing Serverless mode, and how do you utilize it?

Ans: By dividing an application into smaller, more manageable pieces known as lambdas, Serverless mode implementation greatly enhances a program's scalability and readability. A "pay for what you use" philosophy, also encourages affordability.

Next.js's Serverless mode must be enabled by adding the "serverless" build target to next.config.js.

Q13) Is static CDN supported by Next.js?

Ans: Yes, static CDN is supported by Next.js 5 and higher. Next.JS now seamlessly loads assets from CDN thanks to the assets prefix.

Q14) Is JS more difficult than React?

Ans: It's simple to code; Next. js takes less code than React and other React-compatible frameworks. Less code, greater readability, and better project management are all benefits of this approach, which only requires developers to create the page and link to the component in the header.

Q15) What kind of framework—frontend or backend—is Next.js?

Ans: By going one step further, Next.js eliminates the necessity for a backend framework. You can make React applications that are entirely server-rendered thanks to it. This means that a whole HTML page with all required resources, such as JavaScript files, CSS files, and graphics, will be downloaded to the user's browser.

Q16) Is it possible to learn Next.js without React?

Ans: Studying React is a prerequisite for learning Next.js because Next.js is based on React. React is a JavaScript package that enables the creation of reusable components and aids with coding structure.