Python write JSON to file pretty

Use the optional argument indent in the dumps() function to write JSON to file pretty in Python. The json.dump() method provides the following parameters to pretty-print JSON data.

json.dumps(mydata, indent=4)

The indent parameter specifies the spaces used at the beginning of a line.

Python writes JSON to files pretty example

Simple example code Pretty Printed JSON formatted data into a file.

import json

student = {
    "id": 1,
    "name": "John Duggar",
    "class": 9,
    "attendance": 75,
    "subjects": ["English", "Geometry"],
    "email": "[email protected]"
}

with open("stu.json", "w") as write_file:
    json.dump(student, write_file, indent=4)

Output:

Read and PrettyPrint JSON file from Python

• Read the JSON file first using json.load() method.
• Use json.dumps() method to prettyprint JSON properly by specifying indent and separators. The json.dumps() method returns prettyprinted JSON data in string format.
• Print final JSON

import json

with open("stu.json", "r") as read_file:
    student = json.load(read_file)

    res = json.dumps(student, indent=4, separators=(',', ': '), sort_keys=True)
    print(res)

Output:

{
    "attendance": 75,
    "class": 9,
    "email": "[email protected]",
    "id": 1,
    "name": "John Duggar",
    "subjects": [
        "English",
        "Geometry"
    ]
}

Do comment if you have any doubts or suggestions on this Python write file topic.

Note: IDE: PyCharm 2021.3.3 (Community Edition)

Windows 10

Python 3.10.1

All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.