app.use is a way to register middleware or chain of middlewares (or multiple middlewares) before excuting any end rout logic or intermediary route logic depending upon order or middleware registration
resource : https://stackoverflow.com/questions/11321635/nodejs-express-what-is-app-use3
Json means JavaScript Object Notation
resource : https://stackoverflow.com/questions/11321635/nodejs-express-what-is-app-use3
Json means JavaScript Object Notation
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