What are some alternatives?
Vue.js - Reactive Components for Modern Web Interfaces
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Backbone.js - Give your JS App some Backbone with Models, Views, Collections, and Events
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.
ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple