var MongoClient = require("mongodb").MongoClient, assert = require('assert');

 var url = "mongodb://<USER>:<PWD>@host_1:27017,host_2:27017,host_3:27017,host_4:27017,host_5:27017,host_6:27017/test?ssl=true&replicaSet=Cluster0-shard-0&authSource=admin&readPreference=nearest"

// Use connect method to connect to the server
MongoClient.connect(url, function(err, client) {
  assert.equal(null, err);

  const db = client.db("test1");
  console.log("Connected successfully to server");

 db.dropDatabase(function(err, result){
        console.log("Error : " + err);

        if (err) throw err;
        console.log("Operation Success ?" + result);

        // after all the operations with db, close it.
        client.close();
  });
});