JSONTOONdata:encodetokens{key}parsevalueLLM[array]formattruenullstring-54%"id"asyncstreamAPIdecode
Protocol v3.0 Evolution

Precision Engineering
for LLM Data
Try TOON

TOON is the first lossless serialization format built with token-density
as a primary primitive. Perfect clarity. Absolute efficiency.

Get StartedView Core Spec
bash — toon-cli — 80x24
user@dev:~$ npm install -g @toon/cli
added 1 package in 450ms
user@dev:~$ toon convert dataset.json --optimize
Analyzing structure...
✔ Schema detection complete
✔ Token density optimization: 54.6% reduction
✔ Output saved to ./dataset.toon
user@dev:~$ toon inspect dataset.toon
Mode: Stream/Hybrid
Records: 142,800
Size: 48MB (was 105MB)
Tokens: 8.2M (was 18.1M)
user@dev:~$ _