Does node.js have equivalent to window object in browser

The closest equivalent in node is global. I'm not sure if it translates in all of the same ways, but if you open a REPL and type in this === global, it will return true.

Here's a discussion on the global object, though some it the information may be deprecated as it's pretty old: 'Global' object in node.js

Yes, the global variable is the global object in Node.js

From the docs:

global# {Object} The global namespace object. In browsers, the top-level scope is the global scope. That means that in browsers if you're in the global scope var something will define a global variable. In Node this is different. The top-level scope is not the global scope; var something inside a Node module will be local to that module.