Node. js is a runtime environment, which let users choose how to use, whether frontend or backend, and one common language can be used as backend and front end. This environment is entirely based on V8 JavaScript engine. Node.js is utilized "in frontend", which is expected to mean program based code execution, aren't right. Node.js is a backend stage. It is, most actually, a runtime motor based on V8 (with up and coming API support for different JS motors). That has not changed since it's beginning.