MessagePack

pip install msgpack-python

import msgpack
import json

d = {'person': [{'name': 'Rick', 'age': 30}, {'name': 'Sam', 'age': 10}], 'total': 2}
j = json.dumps(d)
m = msgpack.dumps(d)

print('len of json: %s, len of msgpack: %s' % (len(j), len(m)))
print('-'*8)
print(j.encode(), len(j.encode()))
print(m)

>>>
len of json: 81, len of msgpack: 47
--------
b'{"person": [{"name": "Rick", "age": 30}, {"name": "Sam", "age": 10}], "total": 2}' 81
b'\x82\xa6person\x92\x82\xa4name\xa4Rick\xa3age\x1e\x82\xa4name\xa3Sam\xa3age\n\xa5total\x02'