Is my data safe to convert here?

Yes. All conversion happens in your browser. No data is transmitted to any server.

Why must the JSON root be an object?

TOML requires a root table (object). JSON arrays at the root level have no direct TOML equivalent, so the input must be a JSON object.

JSON → TOML Converter

JSON Input

TOML Output

Why use a private JSON to TOML converter?

TOML is the preferred config format for Rust (Cargo.toml), Python (pyproject.toml), and Hugo. This converter translates JSON to TOML entirely in your browser — no data is uploaded or transmitted.

How it works

The converter parses the JSON input and maps each type to its TOML equivalent. The JSON root must be an object (not an array) since TOML requires a root table. Nested objects become TOML tables, and arrays of objects become TOML arrays of tables.

Common use cases

Converting package.json configuration sections to Cargo.toml format
Translating JSON config files to TOML for Hugo or other TOML-based tools
Converting JSON API responses to TOML for config file generation

Frequently asked questions

Is my data safe to convert here?: Yes. All conversion happens in your browser. No data is transmitted to any server.
Why must the JSON root be an object?: TOML requires a root table (object). JSON arrays at the root level have no direct TOML equivalent, so the input must be a JSON object.