Nodejs mongodb geoJson returns empty string

JavaScript
1

I want the code below to retrieve the datas stored to mongodb based on the longitude and latitude but for some reason it returns an empty array.

const express = require('express');
const { db } = require('../models/users');
const router = express.Router();
const User = require('../models/users'); 

// get a list of users from the db

    router.get('/ninjas', function(req, res) {
  User.aggregate([
    { 
      $geoNear:
          {
          near: {type: 'Point',
          coordinates: [parseFloat(req.query.lng),
          parseFloat(req.query.lat)]}, 
          spherical: true,
          maxDistance: 100000,
          distanceField: "dist.calculated" 
        } }

]).then(function( users){
       res.send(users);
       console.log(users)
   });
});

The result gotten in postman:
postman0

I will appreciate any help. thank you all in advance