YAML to TOON Converter

YAML is more compact than JSON, but TOON goes further by combining indentation with CSV-like tables for uniform arrays, improving token efficiency for LLM prompts.

Why convert YAML to TOON?

Keep YAML readability with even fewer tokens.
Explicit arrays and columns improve model reliability.
Deterministic conversion back to JSON.

How it works

Paste YAML into the left editor.
Click the TOON button.
Copy or edit the TOON output on the right.

Try the YAML → TOON Playground

Open the LangToon Playground and switch to the YAML tab to convert instantly.