How to Convert JSON NULL values to None using Python

# Convert JSON NULL values to None using Python

Use the json.loads() method to convert JSON NULL values to None in Python. The json.loads method parses a JSON string into a native Python object.

Conversely, the json.dumps method converts a Python object to a JSON formatted string.

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import json

my_json = r'{"name": "Bobby", "tasks": null, "age": null}'

my_dict = json.loads(my_json)

print(type(my_dict))  # 👉️ <class 'dict'>
print(my_dict)  # 👉️ {'name': 'Bobby', 'tasks': None, 'age': None}

The example shows how to convert null values to None using the json.loads() method.

# Convert JSON NULL values to Python None values

The json.loads() method parses a JSON string into a native Python object.

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import json

json_str = r'{"name": "Bobby", "age": 30}'

my_dict = json.loads(json_str)

print(type(my_dict))  # 👉️ <class 'dict'>

The process of converting a JSON string to a native Python object is called deserialization.

# Convert Python None values to JSON NULL values

You can use the json.dumps() method to convert a Python object to a JSON formatted string.

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import json

my_json = r'{"name": "Bobby", "tasks": null, "age": null}'

# ✅ Convert NULL values to None (JSON string to Python object)
my_dict = json.loads(my_json)
print(type(my_dict))  # 👉️ <class 'dict'>
print(my_dict)  # 👉️ {'name': 'Bobby', 'tasks': None, 'age': None}

# ✅ Convert None to null (Python object to JSON string)
my_json_again = json.dumps(my_dict)
print(my_json_again)  # 👉️ '{"name": "Bobby", "tasks": null, "age": null}'

The process of converting a native Python object to a JSON string is called serialization.

You can also have None keys in Python objects, but it should generally be avoided.

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import json

my_dict = {'name': 'Bobby', None: None}

print(my_dict)  # 👉️ {'name': 'Bobby', None: None}

my_json = json.dumps(my_dict)
print(my_json)  # 👉️ '{"name": "Bobby", "null": null}'

my_dict_again = json.loads(my_json)
print(my_dict_again) # 👉️ {'name': 'Bobby', 'null': None}

We started with a Python object that has a None key and a None value.

When we converted the object to JSON, both the key and the value were converted to null.

When we parsed the JSON string into a Python object, the value was converted to None, but the key is still the string null.

Once the key is converted to a string, parsing the JSON string will return a string key in the Python object.

# Additional Resources

You can learn more about the related topics by checking out the following tutorials:

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• Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)