JSON serializing Mongodb

from bson import json_util



json.dumps(result,default=json_util.default)

The pymongo documentation you pointed is obsolete. If you're using version 1.7 I recommend updating. With a more recent version you can do this:

from bson.json_util import dumps

dumps(l)

https://pymongo.readthedocs.io/en/stable/api/bson/json_util.html

Side answer: u'name', u'date', u'_id' etc are the names of the fields of the document on the database.