Introducing Unbundled Middleware in Express.js 4Removing Deprecated Methods from Express.js 4 Appsapp.configure()app.routerres.on(‘header’)res.charsetres.headerSentreq.accepted()Other Express.js 4 Changesapp.use()res.location()app.route()json spacesreq.paramsres.localsreq.isExpress.js Command-Line GeneratorExploring the New Express.js 4 Route Instance and How to Chain ItFurther Express.js 4 Migration Reading Links