RIP JSON. AI just got a data format that doesn’t waste tokens, doesn’t confuse models, and doesn’t bury structure under a pile of punctuation and it’s called TOON. If you work with LLMs, this is the part where everything you thought was “good enough” starts looking ancient. JSON was built for humans. TOON is built for machines. And the difference shows instantly: • 40–60% fewer tokens • Cleaner reasoning • Higher retrieval accuracy • Zero syntactic clutter • Perfect round-trip back to JSON Here’s what structured data looks like in 2025: users[2]{id,name,role}: 1,Alice,admin 2,Bob,user LLMs understand it faster. Your context budget lasts longer. Agents stop hallucinating field names. And Pipelines get cheaper overnight. JSON won the web era. TOON is about to win the AI era. And this is 100% open source (link below)