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...The stack is made up of MongoDB, with document database, used by your back-end application to store its data as JSON (JavaScript Object Notation) documents. Also with Express (sometimes referred to as Express.js), with back-end web application framework running on top of Node.js. As well as Angular (formerly Angular.js), which is a front-end web app framework that runs your JavaScript code in the user's browser, allowing your application UI to be dynamic.