TOML (Tom's Obvious Minimal Language) is a configuration file format that is easy to read due to its clear semantics. It is commonly used in Rust (Cargo.toml), Python (pyproject.toml), and other projects.

How does this converter work?

Paste JSON in the left panel and click 'JSON to TOML' to convert it, or paste TOML in the right panel and click 'TOML to JSON'. All processing happens in your browser — no data is sent to any server.

Does it support nested tables?

Yes. Nested JSON objects are converted to dotted TOML table headers (e.g., [server.database]), and nested TOML sections are parsed back into nested JSON objects.

Are there any limitations?

This converter handles the most common TOML features: key-value pairs, tables, arrays, strings, numbers, and booleans. Advanced features like inline tables, array of tables, multiline strings, and datetime types are not supported.

Yes. All conversion is done entirely in your browser using JavaScript. Your data never leaves your device and nothing is stored or transmitted to any server.

JSON ↔ TOML Converter

Convert between JSON and TOML configuration formats instantly. Paste your data, click a button, and get the converted output. Everything runs in your browser — your data is never sent to any server.

JSON

TOML

What Is a JSON to TOML Converter?

A JSON to TOML converter transforms data between two popular configuration file formats. JSON (JavaScript Object Notation) is widely used in web development and APIs, while TOML (Tom's Obvious Minimal Language) is favored for its readability in project configuration files like Cargo.toml and pyproject.toml.