trying to get the array result for mongodb in expressjs

Question

I'm trying to get a result from MongoDB database return as a response for my GET Request when I make the call I'm getting undefined in the response, I'm able to see the result in console log on the database side of the code. I'm feeling like it might have something to do with it being an array

MongoClient = require('mongodb'),
  mongodburl = "mongodb://localhost:27017",
  mongo = require('mongodb'),
  assert = require('assert');


let method={}
method.insertdata=function(data,collectionpara) {
  MongoClient.connect(mongodburl, function (err, db) {
    assert.equal(null, err);
    let dbo = db.db("hor-usData");
    let myobj = data;
    dbo.collection(collectionpara).insert(myobj, function (err, result) {
      assert.equal(null, err);
      console.log("insert data");
      db.close();
    })
  })
}

method.deleteRecords=function(collectionpara) {
  MongoClient.connect(mongodburl, function (err, db) {
    assert.equal(null, err);
    let dbo = db.db("hor-usData");
    var myquery = {
      title: /^B/
    };
    dbo.collection(collectionpara).deleteMany(myquery, function (err, obj) {
      if (err) throw err;
      console.log(obj.result.n + " document(s) deleted");
      db.close();
    })
  })
}
method.getdata=function(collectionpara){
  MongoClient.connect(mongodburl, function(err, db) {
    if (err) throw err;
    let dbo = db.db("hor-usData");
    dbo.collection(collectionpara).find().toArray(function(err, result) {
      if (err){
        return reject(err)
      }
      console.log('result',result);
      return resolve(result);
    });
  });  
}

module.exports = method;

and my router code

let assert = require('assert'),
    express = require('express'),
    router = express(),
    swaggerUi = require('swagger-ui-express'),
    database=require('../databaseCon'),
   // swaggerDocument = require('./swagger.json'),
    utils = require('../utils/utils');
var port = process.env.PORT || 3000;


//get donedeal
router.get('/getDonedeal', function (req, res, next) {
    let donedealResult = []
    donedealResult=database.getdata('donedeal');
    res.send(donedealResult);
});

//get carzone
router.get('/getCarzone', function (req, res, next) {
    let carzoneResult = [];
    carzoneResult=database.getdata('carzone');
    res.send(console.log(carzoneResult));
});


router.get('/cars', function (req, res, next) {
    res.router('Mainrouter')
});

router.get('/getCarzone', function (req, res, next) {
    var resultArray = []
});
router.listen(port);
//app.use('/api-docs', swaggerUi.serve, swaggerUi.setup(swaggerDocument));
//app.use('/api/v1', router);
module.exports = router;