INI (Initialization) files are plain-text configuration files organized into sections and key-value pairs. They originated in early Windows systems and remain widely used in PHP applications (php.ini), Linux desktop environments, game engines (Unreal, Unity), embedded systems, and many cross-platform tools. Their simple, human-readable format makes them ideal for configuration where XML or JSON might be overkill. INI files use [sections] to group settings and key=value pairs for individual parameters, with ; or # for comments.

This tool supports dot-notation nested sections commonly used in modern INI dialects. For example, [database.connection] creates a nested JSON object: {"database": {"connection": {...}}}. Sections like [a.b.c] produce three levels of nesting. The converter intelligently merges nested sections with their parent sections, so keys defined under [database] and [database.connection] coexist properly in the output hierarchy.

When "Merge Duplicate Keys" is enabled (default), repeated keys under the same section are automatically combined into a JSON array. For instance, multiple server= entries become "server": ["value1","value2","value3"]. This also supports explicit array syntax like item[]=a and indexed notation item[0]=first. When disabled, later values simply overwrite earlier ones, matching strict INI behavior.

Smart Types automatically detects and converts INI values to appropriate JSON data types. Numeric strings like "123" or "3.14" become JSON numbers, boolean indicators (true/false, yes/no, on/off) become JSON booleans, and null/none become JSON null. Quoted values like host="127.0.0.1" always remain strings. You can toggle this off to keep all values as plain strings.

This tool focuses on INI-to-JSON conversion, which is the most requested direction. JSON-to-INI is inherently lossy because JSON supports nested objects, arrays, and mixed types that don't map cleanly to flat INI sections. However, you can use the Swap button to move JSON into the input panel and experiment. For production reverse conversion, consider a dedicated JSON-to-INI tool that handles flattening and array serialization properly.

This converter supports the most common INI dialects: both key=value and key:value delimiters, semicolon (;) and hash (#) comments, inline comments, quoted values with single or double quotes, dot-notation nested sections, and blank lines. It also handles BOM markers, trailing whitespace, and values containing special characters. Global key-value pairs (before any section) are placed at the root of the JSON output.

JSON is the de facto standard for modern web APIs, configuration management tools (Docker, Kubernetes, Terraform), and JavaScript/Node.js applications. Converting INI to JSON enables seamless integration with these ecosystems, allows use of JSON Schema validation, simplifies parsing in JavaScript/Python/Go, and makes configurations compatible with cloud services like AWS and Azure that expect JSON-formatted settings.

Absolutely safe. All conversion happens entirely in your browser using client-side JavaScript. No data is ever uploaded, transmitted, or stored on any server. Your INI configuration files never leave your device. You can verify this by disconnecting your internet after loading the page — the converter continues to work perfectly offline.