Nodejs and Expressjs
Node.js is a platform for building the i/o applications which are server-side event-driven and made using JavaScript. Express.js is a framework based on Node.js for which is used for building web-application using approaches and principles of Node.js.event-driven.
For understanding the basic express.
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Difference between app.use and app.all PS: check 2-3 answers
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Difference between app.js vs app.get