NetScape

MERN stands for MongoDB, Express, React, Node, after the four key technologies that make up the stack.

MERN is one of several variations of the MEAN stack (MongoDB Express Angular Node), where the traditional Angular.js frontend framework is replaced with React.js. Other variants include MEVN (MongoDB, Express, Node), and really any frontend JavaScript framework can work.

Express and Node make up the middle (application) tier. Express.js is a server-side web framework and Node.js is the popular and powerful JavaScript server platform. Regardless of which variant you choose, ME(RVA)N is the ideal approach to working with JavaScript and JSON, all the way through

MongoDB - document database
Express(.js) - Node.js web framework
React(.js) - a client-side JavaScript framework
Node(.js) - the premier JavaScript web server

MERN is the stack of choice for today’s web developers looking to move quickly, particularly for those with React.js experience.

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