MERN is a free and open-source JavaScript software stack for building dynamic web sites and web applications.
MERN stands for the technologies involved: MongoDB, Express, React and NodeJS.
MongoDB is a document-based open source database
Express is a web framework for Node.js
React is a JavaScript front-end library for building user interfaces
Node.js is a JavaScript runtime built on Chrome’s V8 JavaScript engine
Because all components of the MERN stack support programs that are written in JavaScript, MERN applications can be written in one language for both server-side and client-side execution environments.
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