Is it Possible to get a empty JSON structure from a Mongoose Schema

Consider I am having a Mongoose Schema defined:

var MySchema = new mongoose.Schema({
field: mongoose.Schema.Types.String
});

now can I get the empty JSON object, something like

var MyJSON = MySchema.getJSON();  //This is where I want answers

So that MyJSON will be:

{
field:'';
}

So I can create a Empty JSON object and use it, like:

MyJSON.field = 'my_new_value';

Advanced Thanks for help..