JSON to TOON converter
Paste JSON on the left and get TOON on the right — the same data model, usually 30–60% fewer tokens when your data contains uniform arrays of objects. The receipt below the converter shows your exact savings, counted with the same tokenizers OpenAI models use, not an estimate.
Conversion runs entirely in your browser using the official TOON encoder. Nothing is uploaded, so it is safe for production payloads and API keys embedded in fixtures.
JSON TOON
TOON out
Convert something to print your token receipt.
Questions
- How much smaller is TOON than JSON?
- For uniform arrays of objects, typically 30–60% fewer tokens than formatted JSON. Small, deeply-nested or irregular data saves less and can occasionally be larger — the receipt shows the exact number for your payload.
- Is the JSON to TOON conversion lossless?
- Yes. TOON encodes the full JSON data model, so decoding the result returns the original value. Paste the output into the TOON to JSON tool to prove the round-trip yourself.
- Is my JSON uploaded anywhere?
- No. Parsing, conversion and token counting all run in your browser — there is no backend and nothing is sent over the network.