Pretty-Print JSON from dict to string, very Human-Friendly but still Valid JSON, Python3.

pretty_json.py

from json import dumps


def json_pretty(json_dict: dict) -> str:
    """Pretty-Printing JSON data from dictionary to string."""
    _json = dumps(json_dict, sort_keys=1, indent=4, separators=(",\n", ": "))
    posible_ends = tuple('true false , " ] 0 1 2 3 4 5 6 7 8 9 \n'.split(" "))
    max_indent, justified_json = 1, ""
    for json_line in _json.splitlines():
        if len(json_line.split(":")) >= 2 and json_line.endswith(posible_ends):
            lenght = len(json_line.split(":")[0].rstrip()) + 1
            max_indent = lenght if lenght > max_indent else max_indent
            max_indent = max_indent if max_indent <= 80 else 80  # Limit indent
    for line_of_json in _json.splitlines():
        condition_1 = max_indent > 1 and len(line_of_json.split(":")) >= 2
        condition_2 = line_of_json.endswith(posible_ends) and len(line_of_json)
        if condition_1 and condition_2:
            propert_len = len(line_of_json.split(":")[0].rstrip()) + 1
            xtra_spaces = " " * (max_indent + 1 - propert_len)
            xtra_spaces = ":" + xtra_spaces
            justified_line_of_json = ""
            justified_line_of_json = line_of_json.split(":")[0].rstrip()
            justified_line_of_json += xtra_spaces
            justified_line_of_json += "".join(
                line_of_json.split(":")[1:len(line_of_json.split(":"))])
            justified_json += justified_line_of_json + "\n"
        else:
            justified_json += line_of_json + "\n"
    return str("\n\n" + justified_json if max_indent > 1 else _json)


if __name__ in '__main__':
    print(json_pretty({"a": 1, "b": False, "c": -1, "d": 9.9, "longers": "z"}))

Running:

python3 json_pretty.py

Produces:

{
    "a":       1,

    "b":       false,

    "c":       -1,

    "d":       9.9,

    "longer":  "z"
}

Compare to Normal json.dumps() output:

{"b": false, "a": 1, "longers": "z", "d": 9.9, "c": -1}

What it does ❔

• Adds 4 Spaces for Indentation.
• Alphabetically Sort Keys.
• Justify all properties indenting them to the right.
• Add 1 Empty Blank New Line after each Key:Value pair.
• Still Valid JSON, JavaScript Compliant too.
• Python3 Ready (Remove Function Annotations for Python2 use).

Note:

• Lots of people told me to do this with pprint.pprint() but I can not find a way to do the same with pprint() only (it outputs something similar to json.dumps only), if you know how comment below.

😸