TOON (Token-Oriented Object Notation) is a data serialization format designed specifically for LLM prompts to be highly efficient. It dramatically reduces token usage by 30-60% compared to JSON while remaining structured and human-readable. By using a tabular format for arrays and minimal syntax for objects, TOON makes your data cheaper and faster to process with AI models.

What's the difference between TOON and JSON?

The key difference is token efficiency. JSON is verbose, with brackets, quotes, and commas that consume tokens. TOON is a more compact syntax designed for LLMs, representing arrays as tables with headers and using minimal punctuation. This efficiency directly translates to significant cost savings on your LLM API bills, especially for large or repeated datasets.

How much can I save with TOON?

You can typically expect to save 30-60% on LLM tokens compared to using JSON. For large datasets or frequent API calls, this translates directly into significant cost savings. Data with repeated structures, like API responses or database results, often sees savings at the higher end of this range (40-60%).

Is TOON compatible with all LLMs?

Yes. TOON is a simple text format that works flawlessly with all major large language models, including those from OpenAI (GPT-4), Anthropic (Claude), Google (Gemini), and Meta (LLaMA). Since any LLM can process plain text, they can all be instructed to understand and parse the TOON format with a simple instruction in your prompt.

Can I convert TOON back to JSON?

Absolutely. TOON is fully and losslessly reversible. Our converter tool supports bidirectional conversion, meaning you can convert TOON back to the exact original JSON structure without any data loss. This allows you to use TOON for efficiency and then convert back to JSON for compatibility with other tools.

What types of data work best with TOON?

TOON can represent any valid JSON data, but it delivers the highest token savings (40-60%) on uniform tabular data. This includes database query results, API responses with lists of objects, analytics data, or product catalogs. While TOON fully supports nested objects and arrays, the token reduction is most dramatic with flatter, more repetitive data structures.

Is my data safe when using this converter?

100% safe. All conversion from JSON to TOON (and back) happens locally in your browser. Your data is never sent to any server, never stored, and never seen by us. The converter even works offline once the page has loaded, guaranteeing your information remains private.

Yes, completely free. Both this TOON converter and the underlying TOON format specification are open and free to use without any limits, file size restrictions, or premium features. It's an open-source effort to make working with LLMs more efficient for everyone.

Privacybeleid

Laatst bijgewerkt: 12/27/2025

Operaties aan de klantzijde

JSON naar TOON Converter is een client-side applicatie. Dit betekent dat alle logica voor het converteren van gegevens rechtstreeks op uw computer wordt uitgevoerd, in uw webbrowser. Wij beschikken niet over een server die uw gegevens verwerkt.

Geen gegevensverzameling

Wij verzamelen, bewaren of verzenden geen van de gegevens die u in de converter invoert. De gegevens die u in JSON naar TOON Converter plakt, verlaten uw machine nooit. Er zijn geen logbestanden, geen databases en geen gegevens over uw activiteiten.

Geen cookies voor tracking

Wij gebruiken geen cookies of andere trackingtechnologieën om uw gedrag te monitoren. De enige gegevens die we opslaan in de lokale opslag van uw browser zijn uw voorkeur voor het lichte of donkere thema, voor uw gemak. Deze informatie wordt niet naar ons verzonden.

Beleidswijzigingen

Hoewel de meeste wijzigingen waarschijnlijk klein zullen zijn, kan JSON to TOON Converter zijn privacybeleid van tijd tot tijd en naar eigen goeddunken wijzigen. Wij moedigen bezoekers aan om deze pagina regelmatig te controleren op eventuele wijzigingen in het privacybeleid.