JSON ↔ TOML
This free JSON ↔ TOML tool converts JSON into TOML and TOML back into JSON, so you can move config between formats in a click. Paste text or load a file, pick a direction, and copy or download the result — all processed on your device.
How to use JSON ↔ TOML
- 1 Paste JSON or TOML into the Input box, or use 'Load JSON / TOML file' to open one from your computer.
- 2 Click 'JSON → TOML' or 'TOML → JSON' to convert in that direction.
- 3 Loading a .toml file auto-converts to JSON; a .json file auto-converts to TOML.
- 4 Copy the highlighted result or download it as a file — invalid input shows a clear error instead.
Frequently asked questions
Is my config data sent to a server?
No. The conversion between JSON and TOML runs entirely in your browser. Your data stays on your device, which makes it safe for private or proprietary configuration files.
Why is my conversion failing?
It usually means the input isn't valid for the direction you picked — for example malformed JSON syntax, or TOML that doesn't parse. The tool shows the parser's error message so you can find the issue.
Can I load a file instead of pasting?
Yes. Use the 'Load JSON / TOML file' button to open a .json or .toml file. The tool detects the type and converts it to the other format automatically.
Does the converter work offline?
Yes. As a PWA, PDFPowerHub keeps working once loaded, so you can convert JSON and TOML with no internet connection.