This book starts off with an introduction to JavaScript security and gives you an overview of the basic functions JavaScript can perform on the Web, both on the client side and the server side. It demonstrates a couple of ways in which RESTful APIs can be laden with security flaws. You will also create a simple RESTful server using Express.js and Node.js. You will then focus on one of the most common JavaScript security attacks, cross-site scripting, and how to prevent cross-site scripting and cross-site forgery.

Last but not least, the book covers JavaScript phishing, how it works, and ways to counter it.

By the end of this book, you will be able to identify various risks of JavaScript and how to prevent them.