Free online JSON to INI converter

Source format: JSON

JSON (JavaScript Object Notation) is a lightweight, text-based data format used to store structured information as key-value pairs, arrays, numbers, strings, booleans, and null values. It is widely used by developers, web services, APIs, configuration tools, and automation scripts because it is easy for both humans and machines to read and parse. Typical JSON files are used for application settings, API responses, data exchange, and structured records.

Target format: INI

INI is a simple configuration file format organized into sections and key-value pairs. It is commonly used by desktop applications, legacy software, and system tools for storing preferences and basic configuration data. INI files are easy to edit manually, compact, and broadly supported, but they are much less expressive than JSON because they do not natively support nested objects, arrays, or complex data types.

How to perform the conversion

Converting JSON to INI is not always a one-to-one transformation, because JSON can contain nested structures and arrays that do not map directly to INI. The best approach depends on how your JSON is structured and how the target application expects the INI file to look.

1. Inspect the JSON structure. If the file contains simple top-level key-value pairs, it can usually be converted cleanly. If it contains nested objects or arrays, decide how those should be flattened into INI sections and keys.
2. Choose a conversion tool. For simple files, a text editor plus a small script is often the most reliable method. For repeated conversions, a scripting language such as Python is usually the best option. If you only need a quick one-time conversion, you can also convert the file on 101convert.com for free, without installing any software.
3. Map JSON keys to INI sections. A common convention is to turn top-level JSON objects into INI sections and nested properties into keys inside those sections. For example, a JSON object like {"database": {"host": "localhost", "port": 5432}} may become [database] with host=localhost and port=5432.
4. Convert arrays carefully. INI has no standard array type, so arrays are often represented as repeated keys, comma-separated values, or numbered keys such as item1, item2. The exact representation must match the software that will read the INI file.
5. Save the result as .ini. Make sure the output uses plain text encoding, usually UTF-8, and verify that section names and key names follow the syntax expected by the target application.

If you prefer scripting, a small Python program can read JSON and write INI using libraries such as configparser for simple structures. For more complex mappings, custom code is usually necessary because there is no universal JSON-to-INI standard.

Quality, compatibility, and limitations

The main limitation of this conversion is that JSON is more expressive than INI. Nested objects, arrays, mixed data types, and deeply structured data may be lost or simplified during conversion. Because of that, the output INI file may not preserve the original JSON exactly.

Compatibility also depends on the application that will read the INI file. Different programs support slightly different INI dialects: some allow comments, quoted values, duplicate keys, or nested section naming conventions, while others do not. Always check the target software’s documentation before converting.

For best results, use JSON files that already contain simple configuration-style data. If the JSON is meant for data exchange rather than configuration, converting it to INI may reduce clarity and usefulness. After conversion, open the INI file in the target application or a text editor to confirm that all values were interpreted correctly.