import json
your_json = '["foo", {"bar":["baz", null, 1.0, 2]}]'
parsed = json.loads(your_json)
print(json.dumps(parsed, indent=4, sort_keys=True))
#output:
'''
[
"foo",
{
"bar": [
"baz",
null,
1.0,
2
]
}
]
'''