Book Image

Next.js Quick Start Guide

By : Kirill Konshin
Book Image

Next.js Quick Start Guide

By: Kirill Konshin

Overview of this book

Next.js is a powerful addition to the ever-growing and dynamic JavaScript world. Built on top of React, Webpack, and Babel, it is a minimalistic framework for server-rendered universal JavaScript applications. This book will show you the best practices for building sites using Next. js, enabling you to build SEO-friendly and superfast websites. This book will guide you from building a simple single page app to a scalable and reliable client-server infrastructure. You will explore code sharing between client and server, universal modules, and server-side rendering. The book will take you through the core Next.js concepts that everyone is talking about – hot reloading, code splitting, routing, server rendering, transpilation, CSS isolation, and more. You will learn ways of implementing them in order to create your own universal JavaScript application. You will walk through the building and deployment stages of your applications with the JSON API,customizing the confguration, error handling,data fetching, deploying to production, and authentication.
Table of Contents (9 chapters)

Adding styles to an application – CSS in JS

There are many ways a Next.js app can be styled.

The simplest way is to use inline styles. Obviously, this is the worst possible way, but we'll start small:

const selectedStyles = {
fontWeight: 'bold'

const regularStyles = {
fontWeight: 'normal'

const Btn = ({href, onClick, children, pathname}) => (
<button style={pathname === href ? selectedStyles : regularStyles}}>

Obviously, this does not scale at all. Luckily, Next.js offers a technique called JSS (one of many ways to have CSS in JS), and JSS can be used straight inside JSX to define styles:

// components/button.js
import React from 'react';
import {withRouter} from 'next/router';

export default withRouter(({href, onClick, children, router}) => (