TOON Tools

TOON (Token-Oriented Object Notation) tools help analyze JSON data structure, estimate API costs, and optimize token usage for LLM APIs. Convert JSON to TOON format to see tokenized representations with depth tracking, then reconstruct JSON from tokens with automatic formatting. Validate TOON format to catch syntax errors and style issues. Estimate token counts and calculate API costs for major LLM providers like GPT-4, Claude, and Llama to plan your API budget accurately. Essential for developers integrating LLMs, AI engineers, API architects, and anyone working with language model APIs.

Start by pasting your JSON data into the JSON to TOON Converter to see how it tokenizes—this helps understand token distribution and structure. Use the TOON to JSON Converter to reconstruct or validate tokenized data back to JSON. Run the TOON Validator & Linter to check your TOON format for errors, warnings, and style suggestions. Finally, use the Token Count & Cost Estimator by pasting your input text (and optional output text) to estimate tokens and calculate costs across different LLM providers. All tools work offline in your browser with no API keys required.