Helper functions that converts a MongoEngine Document to a Python Dict so it can be easily converted to JSON.

gistfile1.py

class Person (db.Document):

	name = db.StringField(required=True)
	created_date = db.ComplexDateTimeField(default=datetime.datetime.utcnow(), required=True)

	def to_dict(self):
		return helper.mongo_to_dict(self,[])
		
#helper.py
def mongo_to_dict(obj, exclude_fields):
  return_data = []

	if obj is None:
		return None

	if isinstance(obj, Document):
		return_data.append(("id",str(obj.id)))

	for field_name in obj._fields:

		if field_name in exclude_fields:
			continue

		if field_name in ("id",):
			continue

		data = obj._data[field_name]

		if isinstance(obj._fields[field_name], ListField):
			return_data.append((field_name, list_field_to_dict(data)))
		elif isinstance(obj._fields[field_name], EmbeddedDocumentField):
			return_data.append((field_name, mongo_to_dict(data,[])))
		elif isinstance(obj._fields[field_name], DictField):
			return_data.append((field_name, data))
		else:
			return_data.append((field_name, mongo_to_python_type(obj._fields[field_name],data)))

	return dict(return_data)

def list_field_to_dict(list_field):

	return_data = []

	for item in list_field:
		if isinstance(item, EmbeddedDocument):
			return_data.append(mongo_to_dict(item,[]))
		else:
			return_data.append(mongo_to_python_type(item,item))


	return return_data

def mongo_to_python_type(field,data):

	if isinstance(field, DateTimeField):
		return str(data.isoformat())
	elif isinstance(field, ComplexDateTimeField):
		return field.to_python(data).isoformat()
	elif isinstance(field, StringField):
		return str(data)
	elif isinstance(field, FloatField):
		return float(data)
	elif isinstance(field, IntField):
		return int(data)
	elif isinstance(field, BooleanField):
		return bool(data)
	elif isinstance(field, ObjectIdField):
		return str(data)
	elif isinstance(field, DecimalField):
		return data
	else:
		return str(data)

thanks.

Thanks! Could you also provide a converter from QuerySet ?

Is there any problem in doing it this way :
object_dict = json.loads(object.to_json())

Have you considered object.to_mongo().to_dict()? http://stackoverflow.com/a/27854793/379420