The JSON to TOON Converter is a free Chrome add-on designed for developers looking to optimize their LLM prompts. This tool converts verbose JSON data into the more efficient TOON (Token-Oriented Object Notation) format, allowing users to save significantly on token costs—up to 60%—when using LLM APIs. Its schema-aware design ensures that the converted data remains human-readable while maximizing efficiency for context windows.

Key features include an integrated sidebar tool for a seamless user experience, instant JSON validation to prevent errors, and a convenient drag-and-drop functionality for easy file conversion. The modern user interface enhances workflow, making it a valuable resource for developers who want to streamline their coding processes and reduce recurring token expenses.