JSON ↔ TOML Converter
Convert JSON objects and TOML with exact signed 64-bit integers. Reject null, unsupported dates and unsafe numeric conversions.
How to use
Start with a JSON object, then convert nested objects to TOML tables and arrays to TOML arrays. In reverse mode the TOML document becomes one JSON object. Use this when moving configuration between applications.
Integer tokens use BigInt and must fit TOML’s signed 64-bit range. Decimal values use finite IEEE-754 numbers; notation and trailing zeroes may normalize. Null has no TOML equivalent and is rejected.
Behavior and limits
TOML date/time values are rejected because JSON has no equivalent type; quote them as strings when that is your intended model. Comments and original layout are not retained. Limits: 64 levels and 200,000 characters.
Questions & answers
Can a top-level JSON array be converted?
TOML documents have a root table. Wrap the array in an object, such as {"items":[1,2]}.
Is my input sent to a server?
No. Processing runs in your browser and input is not submitted to an API. Original files and remote databases are not modified.