Node JS is an open source JavaScript runtime environment that has allowed developers to write and run JS outside of the browser. It features an event driven, non-blocking I/O model that is excellent for scalability.

The Node JS ecosystem in conjunction with NPM is absolutely massive, both a boon, and a source of vulnerability. Frameworks like Express, NestJS, Koda and Adones build on top of Node to provide structure to node applications.

Node JS has established itself as valid backend technology that has been adopted by many small and large scale applications successfully. Being able to write JavaScript everywhere once upon a time sounded like crazy talk, but here we are!