MEAN is the short form used for the collection of user-friendly full-stack JavaScript frameworks, namely MongoDB, Express, Angular, and Node.js. All frameworks are quite handy and extremely useful for developing trendy and dynamic websites. Based on a single language - JavaScript for all tiers of the application, it is an open-source stack to swiftly build prototypes. Employers are constantly looking for professionals with mean stack developer certification and sound knowledge of Javascript and MEAN frameworks.