How to use the JSON to TOML
- Paste your JSON into the input box, or open a file.
- The output updates automatically as you type.
- Copy the TOML or download it as a file.
About JSON
JSON (JavaScript Object Notation) is the default data format of web APIs, package manifests and most configuration tooling. It supports objects, arrays, strings, numbers, booleans and null.
About TOML
TOML is a minimal configuration format with clear key = value pairs and [sections]. It powers Cargo.toml, pyproject.toml, Hugo and many other tool configs.
How it works
TOML has no null value, so null fields are dropped. A top-level array is wrapped in an items table because TOML documents must start with a table.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This JSON to TOML processes everything locally in your browser tab. There is no server round-trip, no logging and no storage of your input.
Frequently asked questions
Is this JSON to TOML free?
Yes. This JSON to TOML is completely free to use with no sign-up, no limits and no ads inside the tool.
Is my data uploaded to a server?
No. The JSON to TOML runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Does the JSON to TOML conversion lose data?
TOML has no null value, so null fields are dropped. A top-level array is wrapped in an items table because TOML documents must start with a table.
Can I use the JSON to TOML offline?
Yes. JSON to TOML is also built into DevT Pro, a native app for Mac, Windows, iPad and Linux with 120+ developer tools that work fully offline. It is a $5.99 one-time purchase with no subscription.
