export mongodb connection code example

Example 1: module.exports mongodb connection

const MongoClient = require( 'mongodb' ).MongoClient;
const url = "mongodb://localhost:27017";

var _db;

module.exports = {

  connectToServer: function( callback ) {
    MongoClient.connect( url,  { useNewUrlParser: true }, function( err, client ) {
      _db  = client.db('test_db');
      return callback( err );
    } );
  },

  getDb: function() {
    return _db;
  }
};

Example 2: how to export mongodb database

Mongo Export/dump
mongodump --out </path> --db <dbName> --host <hostname:portNo> --authenticationDatabase admin --ssl --username <Remote Db User> --password<Remote Db Password>
Example:
mongodump --out ~/Desktop/mongoData/ --db newdata --host cluster0-shard-01-02.xyz.mongodb.net:27017  --authenticationDatabase admin --ssl --username abc --password xyz

Mongo Import/restore
mongorestore </path> --db <dbName> --host <hostname:portNo> --authenticationDatabase admin --ssl --username <Remote Db User> --password<Remote Db Password>
Example:
mongorestore ~/Desktop/mongobkup/ --host cluster0-shard-00-02.xyz.mongodb.net:27017  --authenticationDatabase admin --ssl --username abc --password xyz