module exports mongodb connection

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1const MongoClient = require( 'mongodb' ).MongoClient;
2const url = "mongodb://localhost:27017";
3
4var _db;
5
6module.exports = {
7
8  connectToServer: function( callback ) {
9    MongoClient.connect( url,  { useNewUrlParser: true }, function( err, client ) {
10      _db  = client.db('test_db');
11      return callback( err );
12    } );
13  },
14
15  getDb: function() {
16    return _db;
17  }
18};

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module exports vs exports

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