JSON to TOON Converter
JSON is verbose: repeated keys, braces and quotes all burn tokens when you feed structured data to an AI model. TOON (Token-Oriented Object Notation) keeps the same data in a compact, tabular form — this converter rewrites your JSON as TOON and shows the token saving.
Migrating from our previous site: this tool was the most popular one on our old DevAI Hub site and is being rebuilt here as part of the MVP launch.
How it will work
- Paste your JSON (or upload a .json file) — it never leaves your browser.
- The converter validates the JSON and produces equivalent TOON output.
- Compare the estimated token count of both versions, then copy or download the TOON.
When TOON helps most
- Arrays of similar objects (rows of data) — keys are written once, not per row.
- Large prompts and RAG pipelines where structured data eats the context window.
- API prototyping where you pay per token — pair it with the LLM Token Cost Calculator to price the saving.