python if key not in json code example

Example 1: python check if key exist in json

json_string = """{"a": 1, "b": 2, "c": 3}"""
a_dictionary = json.loads(json_string)

b_in_dict =  "b" in a_dictionary

Example 2: python json check if key exist

if 'to' not in data:
    raise ValueError("No target in given data")
if 'data' not in data['to']:
    raise ValueError("No data for target")