How to use the TOON to JSON
- Paste your TOON into the input box, or open a file.
- Adjust the options if needed. The output updates as you type.
- Copy the JSON or download it as a file.
About TOON
TOON (Token-Oriented Object Notation) is a compact encoding of JSON designed for LLM prompts. It uses YAML-style nesting and CSV-style rows for uniform arrays, typically cutting token counts substantially compared with JSON.
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.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This TOON to JSON 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 TOON to JSON free?
Yes. This TOON to JSON 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 TOON to JSON runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Does the TOON to JSON conversion lose data?
The structure and values of your TOON are preserved. Formatting details such as comments are not carried over.
Can I use the TOON to JSON offline?
Yes. TOON to JSON 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.
