What is TOON?
TOON minimizes token usage in LLMs by removing braces and redundant quotes while preserving structure — cutting AI cost and latency.
JSON to TOON
token-efficient conversion
Convert JSON ↔ TOON instantly and reduce LLM token usage by 25–60%. Built for ChatGPT, Claude, Gemini & Grok — data never leaves your device.
JSONInput52 tok
TOONResult35 tok
Why TOON?
Token-Oriented Object Notation strips redundant JSON syntax while staying human-readable — so prompts cost less without losing structure.
Human readable
No trailing-comma noise or strict key quoting. Clean indentation that feels closer to YAML than dense JSON.
Private by design
Every conversion runs in your browser. Your payloads never hit our servers — safe for secrets and proprietary data.
Built for LLM cost
Live token stats show what you save. Use TOON in prompts, RAG context, and tool-calling payloads.
JSON
{
"name": "Project",
"id": 123,
"active": true
}TOON
name: Project
id: 123
active: trueHow it works
Paste JSON
Drop valid JSON into the left editor — nested objects and arrays are fine.
Convert
Encode to TOON or reverse. Token panels update with reduction metrics.
Ship leaner prompts
Copy or download the result into your LLM workflows and pipelines.