How to use the JSON to TOON
- Paste your JSON into the input box, or open a file.
- The output updates automatically as you type.
- Copy the TOON 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 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.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This JSON to TOON 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 TOON free?
Yes. This JSON to TOON 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 TOON runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Does the JSON to TOON conversion lose data?
The structure and values of your JSON are preserved. Formatting details such as comments are not carried over.
Can I use the JSON to TOON offline?
Yes. JSON to TOON 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.
