mongoose find nested object in array in mongoose example

Example 1: mongoose select nested

var fields = { 'properties.OBJECTID': 1, 'properties.TIMESTAMP': 1 };
var query = Feature.find({id: 1}).select(fields);

Example 2: mongoose nested object without id

var subSchema = mongoose.Schema({
    //your subschema content
},{ _id : false });

Example 3: mongoose find by nested property

System.findOne({ 'nodes.main.Alpha': 23000}, function(err, system){
   if(err){console.log(err);}
   else{console.log(system);}
 });