Check if the key exists or not in JSON in Python

Subash Chandran 28th January 2021 Leave a Comment

Let’s use this JSON as an example.

{
    "name_html": "",
    "mkc": 1,
    "kills": 4,
    "deaths": 10,
    "lastCharacter": "Spaz",
    "lastName": "Bolt",
    "rank": 2,
    "games": 5,
    "scores": 170,
    "aid": "pb-IF4lVFFfNQ=="
  }

I would like to find out if rank key is already in this JSON. To check if a key exists in a JSON, we can use in keyword like below.

import json

scoreJson ="""{
    "name_html": "",
    "mkc": 1,
    "kills": 4,
    "deaths": 10,
    "lastCharacter": "Spaz",
    "lastName": "Bolt",
    "rank": 2,
    "games": 5,
    "scores": 170,
    "aid": "pb-IF4lVFFfNQ=="
}"""

print("Checking if rank key exists in JSON")
scores = json.loads(scoreJson)
if "rank" in scores:
    print("Rank already calculated")
else:
    print("Rank doesn't exist in JSON data. Let's calculate")