Node.js Question:

Answer #1
IDEs (editor, debugger, linter)

► Atom (free open-source)
► Nodeclipse Enide Studio (free open-source, Eclipse-based)
► JetBrains WebStorm (commercial)
► JetBrains IntelliJ IDEA (commercial)
► Microsoft Visual Studio with TypeScript
► NoFlo – flow-based programming environment integrated with GNOME APIs

Answer #2
Sublime text is the most popular text editor for Node.js. it has support for so many tools starting for validating JS.

Answer #3
Also it's worth mentioning Sublime, it's the most used one currently as far as I know :)