How to prettyprint a JSON file

The following code will prettyprint a JSON string 

import json

# Json string
json_string = '["foo", {"bar":["pk", null, 56.0, 9]}]'

parsed = json.loads(json_string)
print(json.dumps(parsed, indent=4, sort_keys=True))

[
    "foo",
    {
        "bar": [
            "pk",
            null,
            56.0,
            9
        ]
    }
]