Next js developers are in high demand.
You see, with so many companies trying to build static websites on top of Next js, hiring great devs is difficult. What’s more, making the wrong hire could cost your company thousands of dollars.
So if you want to hire the best Next js developers, you must craft a compelling job description. Then, you need to test the skills and knowledge of the developers who apply to see whether they can meet your demands.
Next js interview questions can help you learn more about each candidate’s coding background and test these skills. You’ll get to know your developers thoroughly, and you can dig into their applications.
But what questions should you ask?
Aside from the standard questions like “What have you accomplished?” and “What are your strengths?”, you’ll want to assess your candidate’s knowledge of Next js.
And in this blog, you’ll find example Next js interview questions and answers to help you do this.
Let’s go!
Next js interview questions and answers
Q: What is Next js, and what are its benefits?
Next js is a JavaScript framework for building server-side rendered (SSR) apps. It offers developers many benefits, including improved performance, automatic code splitting, and easier deployment. It also lets developers use features like hot module reloading and zero-configuration development.
The key difference between React and Next js is how they handle routing.
React uses client-side routing, meaning the page transitions are handled entirely on the client-side using JavaScript. Meanwhile, Next js provides server-side routing. Server-side routing means the server sends the pre-rendered pages to the client, resulting in faster page loads and better SEO.
Q: How does static site generation differ from server-side rendering?
Static site generation generates a website’s HTML, CSS, and JavaScript files before a client requests them. Generating files in advance means the website’s content is pre-built and stored as static files.
In contrast, server-side rendering generates the HTML on the server, dynamically creating the content each time a request is made.
Static site generation is faster since the content is already built and doesn’t require server-side processing, while server-side rendering is more flexible, allowing for dynamic content and interactions.
Q: What is dynamic routing and how is it implemented in Next js?
Dynamic routing is a web app’s ability to serve different pages to the user based on the URL requested.
In Next js, developers can implement dynamic routing using the file system. They can create pages using brackets in the file name, which they can then use as parameters in the URL.
For example, creating a page named [id].js will allow for dynamic routing based on the id parameter in the URL.
Q: What are the different options for styling NextJS apps?
There are different options for styling Next js apps, including CSS modules, CSS-in-JS libraries, and global CSS files.
- CSS modules in Next let you write modular CSS that only applies to specific components. This modularity helps avoid naming repetitions and keeps your CSS organized.
- CSS-in-JS libraries can help you write CSS code directly in your JavaScript code, making it easier to manage the styles for a specific component.
- Global CSS files can be used to apply styles to your entire application.
Each approach has its advantages and disadvantages, and the best choice depends on the needs of your application.
When choosing a styling approach for Next js apps, it’s important to consider factors such as performance, maintainability, and developer familiarity.
Q: How do you deploy a Next js app?
To deploy a Next js app, you first need to run the command “next build” . This command will create a production-ready version of your app in a .next folder.
You can then use various hosting services, such as Vercel, Netlify, or AWS, to deploy your app to a production environment by uploading the contents of the .next folder to your server.
Always remember to set the environment variables needed for your app to run properly in the chosen hosting service.
Q: What are some testing and debugging tools available for Next js apps?
Several testing and debugging tools are available for NextJS apps, including:
- Jest (for unit testing)
- Cypress (for end-to-end testing)
- React Testing Library (for testing React components)
- Next.js built-in debugger (for debugging server-side rendering issues)
Q: How do you work with custom server middleware in Next js?
You can add custom server middleware in Next js by creating a Node.js server and using the use method of the server object to add middleware to it. You can do this in the server.js file, located in the root directory of the Next js app.
Middleware functions can be added using the app.use method and can be used to modify incoming requests and outgoing responses.
Meet available, vetted talent today!
So these Next js interview questions and answers should help you hire a Next js developer or two for your company.
But would you like help with this hiring process?
Whether you’re looking for temporary help or your next full-time developer, let Gun.io help you find the right person for the job. We’ve helped hundreds of companies – from Fortune 500s to start ups – hire world-class talent.
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