This is my schema

var elementSchema = new Schema({
  name: String,
  storage: {
    url: String,
    type: String
  }
});

However when I:

var newElement = new Element();
  newElement.storage = {};
  newElement.storage.url = "asd";
  newElement.storage.type = "asd";
  console.log(newElement.storage);

I get [object Object], whilst it should return {url:"asd",type:"asd"}

In facts, if I go and query it, I get:

{
  storage: "[object Object]",
  bubble: ObjectId("510880b82e6e350200000002"),
  _id: ObjectId("5113c0c0786ece0000000001"),
  __v: 0
}

To use a field named type in an embedded sub-document like storage, you have to use an explicit definition or Mongoose gets confused:

var elementSchema = new Schema({
  name: String,
  storage: {
    url: String,
    type: { type: String }
  }
});