UnhandledPromiseRejectionWarning: MongooseServerSelectionError

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Try this
It seems like you are using MongoDB atlas 

mongoose
     .connect( uri, { useNewUrlParser: true, useCreateIndex: true, useUnifiedTopology: true })
     .then(() => console.log( 'Database Connected' ))
     .catch(err => console.log( err ));

and go to your MongoDB Atlas -> NetworkAccess-> Edit-> and add Current IP address it works!!

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