Every developer ends up writing the same five helper scripts at some point. We saved you the trouble. Convert JSON to TOON (Token-Oriented Object Notation) and back. Reduce LLM prompt tokens by 30-60% to lower GPT and Claude API costs, with a live token-savings estimate. Lossless and 100% in-browser.
The honest one-paragraph version.
Convert JSON to TOON (Token-Oriented Object Notation) and back. Reduce LLM prompt tokens by 30-60% to lower GPT and Claude API costs, with a live token-savings estimate. Lossless and 100% in-browser.
It runs in your browser. Nothing you paste, drop, or generate leaves your device, which matters when you are dealing with client data or unreleased work.
If any of these sound like you, the tool earns its bookmark.
Built mainly for engineers, backend folks, and anyone who lives in the terminal. If you have ever needed convert json to toon and cut llm tokens by 30-60%, you are the audience.
If you are not sure whether this is for you, open it and try one sample. You will know inside ten seconds.
Three steps. The tool does the rest.
Open the tool, drop in the input, and the result appears.
Three reasons that hold up in practice.
Tool sites usually push you toward a Pro upgrade after three uses. We do not have a Pro tier at all. Every feature is free for everyone.
Developer tools at mytoolstudio share three rules. They run in the browser whenever possible. They never lock features behind sign up. And they keep your data on your device unless server work is the only way.
Small habits that compound across a workweek.
Pair it with your editor's keyboard shortcut for opening URLs and you can flow through it without breaking focus.
Stop reading. Start using.
That is everything worth saying. Open the tool and try it on something real. You will know within a minute whether it belongs in your kit.
If you found this useful, the other Developer guides are written in the same voice. We keep them short, practical, and rooted in real work.
mytoolstudio is designed and built by the team at GAP3, a small studio that ships product, brand, and growth work for early stage companies. We built this site as a free public good. Read more about us at gap3.co.
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The tool is one click away. No sign up, no upload, no payment.
Open JSON to TOON Converter