🔄 JSON to TOON Converter

TOON is a compact data format designed specifically for Large Language Models. It encodes the same data as JSON but uses 30-60% fewer tokens by eliminating redundant syntax like braces, brackets, and excessive quotes. This translates directly to cost savings on LLM API calls.

TOON reduces tokens by: (1) Using indentation instead of braces, (2) Converting uniform arrays to tabular CSV-like format with headers, (3) Removing unnecessary quotes from strings, and (4) Using explicit array lengths and field headers that help LLMs parse data more efficiently.

Yes! TOON is designed for perfect round-trip conversion. You can convert JSON to TOON and back to JSON without losing any data. The format preserves all data types including strings, numbers, booleans, null values, arrays, and nested objects.

Use TOON when sending data to LLMs to reduce costs. TOON excels with uniform arrays of objects (like user lists or product catalogs). Keep using JSON for API communication, configuration files, and when you need maximum tooling support. TOON is specifically optimized for LLM input.

All major LLMs can process TOON format since it's plain text. GPT-4, Claude, Gemini, Llama, and other models can understand TOON data. Simply include a brief format note in your prompt (e.g., "Data is in TOON format with tabular arrays") for best results.

Absolutely! All conversion happens entirely in your browser using JavaScript. Your data is never sent to any server and never leaves your device. This makes it safe to use even with sensitive or proprietary data.

At GPT-4 Turbo rates ($10/million tokens), saving 1,000 tokens saves $0.01. For an app making 100 requests/day with 1,000-token payloads improving by 50%, you'd save ~$15/month. At scale with larger payloads, savings can reach hundreds or thousands of dollars monthly.