Free JSON to TOML Converter

How to Convert JSON to TOML Online

Paste your JSON into the left panel and TOML output appears instantly on the right. Nested objects become TOML tables with [section] headers. Arrays of primitive values become inline TOML arrays.

JSON vs TOML — When to Use Which

JSON is the standard for APIs and data exchange. TOML is designed for configuration files — it's more readable, supports comments, and uses clear section headers. Rust (Cargo), Python (pyproject.toml), Hugo, and Deno all use TOML as their native config format.

Frequently Asked Questions

What is TOML?

TOML (Tom's Obvious Minimal Language) is a configuration file format designed to be easy to read. It's used by Rust (Cargo.toml), Python (pyproject.toml), Hugo, and many other tools.

Why convert JSON to TOML?

TOML is more readable than JSON for configuration files — it supports comments, doesn't require trailing commas, and uses clear section headers instead of nested braces.

What JSON types are supported?

All JSON types map to TOML: strings, numbers (integers and floats), booleans, null (omitted), objects (tables), and arrays.

Is this converter free?

Yes — completely free, forever. No sign-up, no account, no usage limits.

Is my data safe?

All conversion happens locally in your browser using JavaScript. Your JSON is never uploaded to any server.