A Python script that fixes the output of this script - https://gist.github.com/SomeAspy/2b27a6d66b97db6bd1b62afac5343285?ref=blog.aspy.dev - to work again.

lurkr-json-upgrader.py

# A quick and dirty script to convert old Lurkr-format data extracted from Arcane to new Lurkr-format

import json
import os
from copy import deepcopy
input_file = 'None'
while not os.path.exists(input_file):
    input_file = str(input('Input file path? '))

output_file = "output.json"

with open(input_file,'r') as old_file:
    old_file_json = json.loads(old_file.read())

new_file_json = {
    "levels": []
}

new_user_json_template = {
    "messageCount":0,
    "user": {
        "avatar": "",
        "discriminator": "0",
        "username": ""
    },
    "userId": "",
    "xp": 0,
    "level": 0
}


for old_user_json in old_file_json["levels"]:
    new_user_json = deepcopy(new_user_json_template)
    new_user_json["messageCount"] = old_user_json["messageCount"]
    new_user_json["user"]["avatar"] = old_user_json["avatar"]
    new_user_json["user"]["username"] = old_user_json["tag"]
    new_user_json["userId"] = old_user_json["userId"]
    new_user_json["xp"] = old_user_json["xp"]
    new_user_json["level"] = old_user_json["level"]
    new_file_json["levels"].append(new_user_json)
with open(output_file,'w') as new_file:
    new_file.write(json.dumps(new_file_json, indent = 2))