TOML to JSON Converter
Paste TOML — get JSON. Tables, array tables, dates and big integers handled, with exact error positions.
TOML
JSON
TOML to JSON, without surprises
Converters often change your data quietly. This one keeps values exact and tells you whenever something can’t be carried over.
- Full TOML 1.0
- Tables, inline tables, array tables, dotted keys and multi-line strings.
- Exact integers
- 64-bit values like IDs are kept exactly.
- Clear errors
- Duplicate keys and syntax mistakes are reported with the line.
- Private & free
- Runs in your browser — config files with secrets never leave your computer.
- Paste, drop or open
- Drop a .toml file anywhere on the input, or switch direction with one click.
Frequently asked questions
How are TOML dates converted?+
JSON has no date type, so dates and times become ISO 8601 strings — local dates stay as 2026-10-15, and times with an offset become UTC timestamps.
Will 64-bit integers be rounded?+
No. Integers too large for JavaScript numbers are written to the JSON exactly.
Which TOML version is supported?+
TOML 1.0, the current version, including inline tables, array tables, dotted keys and all string types.
Is my data uploaded?+
No. Conversion runs in your browser.