How to determine the number of objects in python json?

Question

Python

Good afternoon! How to determine the number of objects in a json string using the standard library.
For example, there are only 2 below.
{
"firstName": "Ivan",
"lastName": "Ivanov",
}
Thank you!

Answer 1

d = {'a':1, 'b':2}
len(d)

If this is a string, and not objects, then first you need to parse json

s = "{'a':1}"
import json
d = json.loads(s)
len(d)

Answer 2

If the json structure is always like this then inputString.count('": "')