JSON Files.

JSON on disk:

import json payload = {"theme": "dark", "level": 3} with open("config.json", "w", encoding="utf-8") as f: json.dump(payload, f)

with open("config.json", encoding="utf-8") as f: loaded = json.load(f) print(loaded["theme"])

Invalid JSON → JSONDecodeError. Catch it and print a short message — do not crash the whole script.