Want to build scalable web apps quickly and easily? Check out the MEAN stack, a collection of technologies (MongoDB, Express, AngularJS, and Node.js) that fit well together to provide a solution that allows for a full-stack javascript implementation of web applications.Popular experts Helen Zeng and Steven Edouard walk you through MEAN and create "Chirp," a Twitter clone. They integrate MongoDB into a REST API with Node.js and Express and then connect that with an AngularJS front end. They even deploy the live app to Microsoft Azure via GitHub. Check out this practical primer on MEAN, and learn to build an end-to-end web app, all using javascript.(NOTE: For a look at individual technologies in the MEAN stack, check out Introduction to AngularJS, You've Got Documents! A MongoDB Jump Start, and Building Apps with Node.js.