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INI to JSON Converter in Python

A Python script that reads an INI configuration file with configparser and prints it as nested JSON, converting numeric and boolean values.

python --version

python ini_to_json.py config.ini

python ini_to_json.py config.ini

Prints the INI file as nested JSON with sections as objects and typed scalar values.

What it does

Converts an INI file into JSON using configparser, which is the quick way to move a legacy config into a modern toolchain.

import configparser
import json
import sys

def coerce(value):
    lowered = value.strip().lower()
    if lowered in {"true", "yes", "on"}:
        return True
    if lowered in {"false", "no", "off"}:
        return False
    try:
        return int(value)
    except ValueError:
        pass
    try:
        return float(value)
    except ValueError:
        return value

def convert(path):
    parser = configparser.ConfigParser()
    parser.read(path)
    return {section: {key: coerce(value) for key, value in parser.items(section)} for section in parser.sections()}

def main():
    print(json.dumps(convert(sys.argv[1]), indent=2))

if __name__ == "__main__":
    main()

Scalar values are coerced to integers, floats, or booleans so downstream JSON consumers get real types rather than strings.

Run and verify

printf '[server]\nport = 8080\ndebug = true\nname = demo\n' > config.ini
python ini_to_json.py config.ini

Create a small INI file with a number and a boolean, then convert; section names become top-level keys.

Expected Output

For the sample section the script should print numbers and booleans as real JSON types. The output is:

{
  "server": {
    "port": 8080,
    "debug": true,
    "name": "demo"
  }
}

Section names become object keys, numeric strings become numbers, and true-like values become the JSON boolean true.

Limitations

Type coercion is heuristic and can convert a numeric-looking string that should stay text; for strict typing, keep values as strings and coerce at the consumer.