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*Express Router* (router.use, router.get, router.post, etc instead of app.use, app.get, app.post, etc): http://expressjs.com/en/api.html#router

*Differences in behavior between app.use and router.use in Express:* https://stackoverflow.com/questions/27227650/difference-between-app-use-and-router-use-in-express/30868426#30868426

*Understanding ExpressJS Routing:* https://code.tutsplus.com/tutorials/understanding-expressjs-routing--cms-29738

*A tutorial covering express.Router() and controllers:* https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/routes