Export from Google App Engine Datastore Backup LevelDB format to JSON flat file

export.py

import sys, os, json
import datetime

sys.path.append(os.path.expanduser('~/google-cloud-sdk/platform/google_appengine/'))
from google.appengine.api.files import records
from google.appengine.datastore import entity_pb
from google.appengine.api import datastore

def myconverter(o):
    if isinstance(o, datetime.datetime):
        return o.isoformat()

for path, dirs, files in os.walk('./'):

    for fn in files:
        f = os.path.join(path, fn)
        if not fn.startswith('output'):
            continue

        with open(f, 'r') as raw:

            reader = records.RecordsReader(raw)

            for record in reader:
                entity_proto = entity_pb.EntityProto(contents=record)
                entity = datastore.Entity.FromPb(entity_proto)
                entity['table'] = path[2:]
                j = json.dumps(entity, default=myconverter)
                print (j)