Inferno JS is a blazing-fast, lightweight, React-like JavaScript library. React developers will find it comfortably familiar. Inferno JS also supplies better performance, smaller size, and other improvements. Inferno is highly modular and unopinionated, encouraging developers to add only the pieces we require and write code to suit our personal preferences. In this tutorial, we’ll introduce the Inferno JavaScript library, then build a simple Inferno app and authenticate it with Auth0.