let MongoClient=require('mongodb').MongoClient;
let userName="name";
let userPassword="password";
let serverHost="localhost";
let serverPort=27017;
let databaseURL=`mongodb://${userName}:${userPassword}@${serverHost}:${serverPort}`;
let databaseName="test";
let databaseCollection="test";

//about to insert data
MongoClient.connect(databaseURL,function(err,client) {

    if(err) throw err;
    else{
        let currentDatabase=client.db(databaseName);
        let currentCollection=currentDatabase.collection(databaseCollection);
        let insertData={
            name:"test",
            address: "this is a test"
        };

        currentCollection.insertOne(insertData,function(err,res) {
            if(err) throw err;
            else console.log("1 document inserted");
            client.close();
        });
    }
});

//about to find data in database
MongoClient.connect(databaseURL, function(err, client) {

    if(err) throw err;
    else{
        let currentDatabase=client.db(databaseName);
        let currentCollection=currentDatabase.collection(databaseCollection);

        currentCollection.find({}).toArray(function(err,result){
            if (err) throw err;
            else console.log(result);
            client.close();
        });
    }
  });