JSON to TOML Converter - Generate Config Files

Convert JSON to TOML format for Cargo.toml, pyproject.toml, and config files. Handles nested tables, arrays, and datetimes. Free, browser-based conversion.

JSON Input

TOML Output

Indent:

Use inline tables for simple objects

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Frequently Asked Questions

TOML (Tom's Obvious, Minimal Language) is popular for configuration files in Rust (Cargo.toml), Python (pyproject.toml), Hugo (config.toml), and many other tools due to its human-readable, minimal syntax that's easier to edit than JSON.

JSON objects become TOML tables, nested objects become nested tables with dot notation or [table] headers, arrays become TOML arrays, and primitive values maintain their types. Dates are preserved as TOML datetime values.

TOML is designed for humans to read and write easily, supports comments (with #), uses key = value syntax, and has no redundant commas or braces. JSON is more verbose but better for data interchange between systems.

Nested objects can be represented as dotted keys (like database.server.ip) or as table headers (like [database.server]). This converter uses table headers for better readability with deeply nested structures.

Yes. TOML supports arrays with square brackets [1, 2, 3] and can handle arrays of tables, which is perfect for configurations with multiple similar items like [[plugins]] or [[dependencies]].

Inline tables are compact single-line representations like point = { x = 1, y = 2 }. They're useful for small nested objects. This converter automatically uses inline tables for simple objects to improve readability.

Yes! TOML supports line comments with the # character, making it ideal for configuration files where you need to document settings. JSON has no native comment support, which is why many projects prefer TOML.

TOML has native datetime support with RFC 3339 format (like 2025-01-15T10:30:00Z). JavaScript Date objects are automatically converted to TOML datetime values, unlike JSON which requires string representation.

Yes. All conversion happens locally in your browser using JavaScript. No data is uploaded to any server. Your JSON configuration never leaves your device, perfect for sensitive config files.

Use TOML for configuration files you'll edit manually (Rust projects, Python packages, static site generators). Use JSON for APIs and data interchange. Use YAML for complex nested configs like Kubernetes where readability of large files matters.

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