Best 25 Next.js Interview Questions | A JavaScript Framework

What is Next.js?
The Next.js is a lightweight JavaScript framework and it is created by Zeit.

The Next.js framework allows us to write server-rendered React apps easily – amongst other cool things.

The Next.js feels like a framework.
The Next.js is based on React, Webpack, and Babel.

The ease-of-use of PHP is a great inspiration. We feel Next.js is a suitable replacement for many scenarios where you otherwise would use PHP to output HTML.
Unlike PHP, we benefit from the ES6 module system and every file exports a component or function that can be easily imported for lazy evaluation or testing.

Why Next.js?
Now the world’s leading companies use and love Next.js.
1.      Server-Side Rendering
2.      Zero Setup
3.      Fully Extensible
4.      Ready for Production
5.      Deploy Anywhere

That's exactly what we do with Next.js?
What is Next.js Features?

The List of Next.js features -
1.      Server-rendered by default
2.      Automatic code splitting for faster page loads
3.      Simple client-side routing (page based)
4.      Webpack-based dev environment which supports Hot Module Replacement (HMR)
5.      Able to implement with Express or any other Node.js HTTP server
6.      Customizable with your own Babel and Webpack configurations
7.      Built-in CSS vendor prefixing
8.      Dynamic styles and themes support
9.      CSS Preprocessing via Plugins
10. Full CSS support, no tradeoffs in power
11. Runtime size of just 3kb (gzipped, from 12kb)
12. Source maps support

How Next.js can improve developer’s life?
1.      Ease of use
2.      Code splitting
3.      Performance for the first-page load
4.      Improved SEO
5.      JavaScript everything

How to use Next.js?
Install it: npm install --save next react react-doms

And add a script to your “package.json” like this:

  "scripts": {
    "dev": "next",
    "build": "next build",
    "start": "next start"

After that, the file-system is the main API. Every .js file becomes a route that gets automatically processed and rendered.

Populate ./pages/index.js inside your project:
function Home() {
    return <div>Welcome You, in Next.js!</div>

export default Home

And then just run npm run dev and go to http://localhost:3000. To use another port, you can run npm run dev -- -p <your port here>.

Is next.js is free open source?

Is this production ready?

Can I use it with GraphQL?

Can I use it with Redux and thunk?

Can I use it with Redux?

Can I use Next.js with my favorite JavaScript library or toolkit?
Yes! why not.

How big is it?
A small Next main bundle is around 65kb gzipped.

How do I use CSS-in-JS solutions?
You can use any CSS-in-JS solution in your and bundles styled-jsx supporting scoped css.

Why a new Router?

Routes don’t need to be known ahead of time.
Routes are always lazy-loadable.
Top-level components can define “getInitialProps” that should block the loading of the route (either when server-rendering or lazy-loading).

How do I fetch data?

It’s up to you. “getInitialProps” is an async function (or a regular function that returns a Promise). It can retrieve data from anywhere.

What Is Automatic code splitting?

Every import you declare gets bundled and served with each page. That means pages never load unnecessary code!

import cowsay from 'cowsay-browser'

function CowsayHi() {
    return <pre>{cowsay.say({ text: 'hi there!' })}</pre>

export default CowsayHi

Next.js vs gatsby?

The Gatsby, while CRA offers client-side rendering and Next.js offers server-side rending, Gatsby is something called “Static Site Generator”. ... Similar to Next.js browser receives pre-rendered HTML code.

At first glance, they both seem very similar.
1.      Generate very performing websites.
2.      Creates SPA out-of-the-box.
3.      Creates good SEO out-of-the-box
4.      Have an awesome developer experience.

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