regex on json file

[senaint]

I'm trying to match a regex expression to the value of Id in a json file. My goal is to iterate over a bunch of json files in a directory and replace the value of the Id key with the regex match. The regex works well by itself when i try it on regex101, however when I run it again the json files on my computer i get a

Error:
 TypeError: expected string or bytes-like object 

. Any and all help appreciated.

import json
import os
import re


rootdir = r'C:\\Users\\homersimpson\\jsondumps'

for files in os.scandir(rootdir):

        with open(files, "r") as file:
            json_data = json.load(file)
            extracted  = re.findall((r'.+?(?<=\$apples\$)'),json_data)
            print(something)