TOML ↔ JSON Converter & Validator

Convert TOML to JSON and JSON to TOML, format and validate TOML 1.0 (tables, dotted keys, arrays of tables, inline tables, multi-line strings), and detect redefined keys, duplicate tables, and integers outside JSON's safe range, offering to preserve them as text instead of losing precision. Dates and times are converted to ISO 8601 text exactly as they appear in the source — zoned values keep their offset, and local values are never reinterpreted as UTC.

Processed on your device, no AIhasta 2.000.000 de caracteres

Data is processed on your device and never sent to any server.

Integers outside safe range

TOML input

or upload a .toml or .json file

The data is processed on your device and is never sent to the server.

Use cases

Convert a TOML config file (e.g. Cargo.toml) to JSON
Validate that a TOML file is well-formed
Convert JSON to TOML for a config file

How to use this tool

Paste or upload the TOML or JSON
Choose the conversion direction
Copy or download the result

Frequently asked questions

Does it change the dates' time zone?

No. A zoned TOML date (offset date-time) keeps its offset; a local date (no zone) stays zone-less in the resulting JSON — it's never reinterpreted as UTC or converted to your device's time.

Does it execute the TOML document?

No. TOML is a data format, not an executable language; this tool only parses and converts it, never executing anything.

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