What is the MEAN stack of JavaScript frameworks?

 The MEAN stack is a collection of JavaScript-based technologies that are commonly used to build web applications. The acronym "MEAN" stands for:

• MongoDB: a NoSQL database that stores data in a document-based format
• Express.js: a web application framework that runs on top of Node.js
• AngularJS (or Angular): a JavaScript framework for building dynamic and interactive user interfaces
• Node.js: a JavaScript runtime that allows you to run JavaScript on the server-side

Together, these technologies provide a full-stack JavaScript solution for building web applications, from the database to the front-end. This allows for a unified development experience, as all parts of the stack use the same programming language (JavaScript).

MongoDB is used to store and retrieve data, Express.js is used to handle routing and middleware, AngularJS is used to build the user interface and handle client-side logic, and Node.js is used to run the server-side code and handle the application's backend.

This stack is popular among developers because it allows them to use the same language for both the client-side and server-side of the application, making development faster and more efficient.

It's worth noting that AngularJs is being replaced by Angular, so the term "MEAN stack" is also used to refer to the stack with Angular instead of AngularJS.