Writing your frontend with pure JavaScript is possible, and it was the way websites were developed for many years. Over the years, several libraries have emerged incorporating different controls and allowing code reusability. As they have grown, some of these libraries have merged together to create a framework that helps developers to create complete websites from start to end, while also providing answers to many aspects required by modern websites, such as routing, authentication, data binding, state management, and so on.

In this book, we will concentrate on three of the most popular JavaScript frameworks today: Angular, React, and Vue.js.