Is Javascript useful outside web? Do developers use it for desktop app or mobile app?

Question

I heard it is possible, but, is it barely possible? or is it a common way to do it?

Answer 1

Yes it's possible and gaining popularity. Here's an example. 😉

Desktop application (Electron)
https://electron.atom.io

Mobile application (React Native)
https://facebook.github.io/react-native/

Answer 2

IOT application
Johnny-fiveJS

Web server
NodeJS/ExpressJS