...which makes the distinction even harder in node, because it is a callback based language. Nearly everything is based on my code being called. Sticking with

...which makes the distinction even harder in node, because it is a callback based language. Nearly everything is based on my code being called. Sticking with the example of express.js, for me it feels more like a library since I'm still in control of the program flow, even though I need to adhere to certain interfaces.