JavaScript is programming languages and writing scripts on the website. Nodejs is a JavaScript runtime environment.JavaScript used on the client side,frontend development and nodeJs used on the server side development.javascript is the upgraded version of ECMA script engine written in C++.NodeJs written c, c++ and javascript.
Nodejs is a JavaScript runtime environment.Actually nodejs used when we develop server site. And Mongodb doing work store data. So, mongodb used for data store.
SQL Data structure is relational or NoSQL is no relational data structure.SQL databases defines and manipulates data based structured query language.NoSQL is database dynamic schema for unstructured data.SQL vertically scalable , NoSQL is horizontally scalable.NoSQL is follows CAP,SQL follows ACID property.