Here is my mongoose model
var mongoose = require('mongoose'),
Schema = mongoose.Schema
var DriverSchema = new mongoose.Schema({
    carNumber : {type : String, required : true, unique : true},
    DriverName : {type : String, required : true},
    loc : {
        type: [Number],
        index:'2d'
    }
});
I am trying to post the latitude and longitude from postman which is :
carNumber         KA51B7499
DriverName        Sachin
longitude         74.9999
latitude          67.2563
I am saving this request in mongoose in the following code :
router.post('/',function(req,res){
    var Driver = new trackCab({
        carNumber: req.body.carNumber,
        DriverName: req.body.DriverName,
        loc: {
            type: [parseFloat(req.body.longitude),parseFloat(req.body.latitude)]
        }
    });
    //console.log(req.body.longitude);
    //console.log(req.body.latitude);
    Driver.save(function(err){
        if(err) console.log(err);
        console.log('User saved successfully!');
    });
});
However longitudes and latitudes are not saved in loc object.
My returned object in postman looks like this :
 {
        "_id": "55773165dda03a9c14cb8468",
        "carNumber": "KA51B7499",
        "DriverName": "Jagdeesh",
        "__v": 0
    },
				
                        
wrong object you are using , loc type is Array , not an Object