Hello! My name is Andrey, I am a front-end developer at Cloud.ru. I work with the LLM API every day. And every day I send structured data into the context: lists of products, logs, users, metrics. It's all JSON. And all this is money.

At some point I counted how many tokens from my prompt were spent on curly braces, quotes and repeating keys. It turned out - a lot. Too much.

Then I tried TOON. Here's what came out of it.

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