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JSON to TOML Converter

JSON Input
1
TOML Output

Last updated:

Jsonic's JSON to TOML converter transforms JSON objects into TOML configuration format. Nested objects become TOML [tables]. Arrays of objects become TOML [[array tables]]. TOML does not support null values — the converter returns a clear error if null fields are present. The root must be an object, not an array.

How to convert JSON to TOML

  1. Paste your JSON object into the left panel.
  2. Click Convert.
  3. Nested objects become TOML [tables].
  4. Arrays of objects become [[array tables]].
  5. Click Copy or Download to save the .toml file.

FAQ

How are nested objects converted?

Nested objects become TOML tables using [section.subsection] notation.

How are arrays of objects converted?

Arrays of objects become TOML array tables using [[section]] syntax.

Is my data sent to a server?

No. Conversion runs entirely in your browser.

What is TOML used for?

TOML is a configuration file format used by Rust projects (Cargo.toml), Python packaging (pyproject.toml), Hugo sites, and many other tools. It is designed to be more readable than JSON for config use cases.

Can TOML represent all JSON types?

Almost. TOML supports strings, integers, floats, booleans, datetime, arrays, and tables. JSON null has no TOML equivalent and will cause an error.

What if my JSON contains null values?

TOML does not support null. Remove null values from your JSON before converting, or replace them with an appropriate default.

Can I convert TOML back to JSON?

Not in this tool. TOML-to-JSON conversion is not currently supported.