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install express -- npm install express --save
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install mongoDB -- installer file: https://www.mongodb.com/download-center/community
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install mongoose -- npm install mongoose --save
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debugging -- node --inspect server.js -- open chrome://inspect and go to chrome://inspect ---- add your website address, example localhost:8000 ---- add 'debugger' line to the code where you want to stop the execution ---- it works!