JSON to TOML
Paste a JSON object of named settings to create a TOML configuration file. Unsupported values are reported before download.
Privacy & Security
All files are processed locally in your browser. Your data never leaves your device and is not uploaded to any server. We do not store, collect, or have access to your files.
How It Works
- 1
Paste a JSON object of named settings
- 2
The tool validates JSON syntax and structure
- 3
Review the TOML output or resolve any unsupported values
- 4
Download as .toml file or copy the formatted result
Use Cases
Convert package.json or config.json to TOML format
Migrate API configurations from JSON to TOML
Prepare configs for Rust, Python, or Go projects
Standardize configuration file formats
Convert build tool configs to TOML
Frequently Asked Questions
Why convert JSON to TOML?
TOML is often more readable for configuration files than JSON. It supports comments, has cleaner syntax for nested data, and is preferred by modern tools like Rust's Cargo.
Are all JSON structures supported?
A JSON object with TOML-compatible strings, booleans, safe numbers, nested objects, and arrays can be converted. TOML has no null value, and a top-level array or primitive is not a TOML document; the tool reports these cases.
What about JSON with dates or special types?
JSON date strings remain strings in TOML. This tool does not infer a TOML datetime from a string.
Is conversion loss-less?
Supported values are preserved. Null, unsafe integers, non-finite numbers, and unsupported roots are rejected rather than silently changed or omitted.
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