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The fastest way for AI engineers to shrink JSON payloads before feeding them to LLMs. Toon (Token-Oriented Object Notation) is a… The fastest way for AI engineers to shrink JSON payloads before feeding them to LLMs. Toon (Token-Oriented Object Notation) is a compact, human-readable serialization format designed specifically to minimize token usage in large language model prompts — especially effective on large uniform arrays (30-60% token savings vs regular JSON). Right-click menu appears only when you select valid JSON One-click conversion to Toon format Instant “Copy Toon” with success feedback Fully offline – no data leaves your browser Built-in popup for manual paste & convert Dark-mode friendly, minimalist UI Perfect for Prompt Engineers, Cursor/Claude users, and anyone optimizing structured data for ChatGPT, Claude, Gemini, Grok, etc.