When the cursor of MongoDB is a stream, the read-out data number begins with a key that cannot be accessed (and a pit is stepped).

Mongdb when reading data with the cursor, the data read directly with the stream key is the beginning of the number of words, is not unique, with Object.keys () all the key printed out the words are as follows: How is this?

Looking at the document, the cursor returns an object model, which means that he triggers the real instance of the document, so it returns all instances of the documnet (including some of the methods), so you can use some of the stream methods to convert it. The real data is actually inside the _doc, so you can use json.stringly () to convert it. The simplest method is Toobject ().

When the cursor of MongoDB is a stream, the read-out data number begins with a key that cannot be accessed (and a pit is stepped).