.crete response in mongoose code example

Example 1: mongoose response to object

MyModel.findOne().lean().exec(function(err, doc) {
    doc.addedProperty = 'foobar';
    res.json(doc);
});

Example 2: callback mongoose get value from document

var query = Model.find({});

query.where('field', 5);
query.limit(5);
query.skip(100);

query.exec(function (err, docs) {
  // called when the `query.complete` or `query.error` are called
  // internally
});