TOON Formatter
Format and beautify TOON with syntax highlighting
Input TOON
Formatted TOON
What Is a TOON Formatter?
TOON (Token-Oriented Object Notation) is a compact format designed for LLMs and token-limited contexts. It reduces token count compared to JSON by using shorter syntax. Like JSON, TOON represents objects, arrays, strings, and numbers. The format is optimized for AI models and APIs with token limits.
A TOON formatter adds indentation and line breaks to raw or minified TOON so you can read the structure clearly. This tool parses your TOON and reformats it. It runs entirely in your browser. Nothing is sent to a server, so it's safe to use with production data or sensitive content.
TOON Formatting Examples
Format TOON for readability. Telecom-themed example:
Example: Subscriber records
Formatted output:
Click the Sample button above to load more examples into the editor.
How to Use This Tool
Paste or Upload
Copy your TOON and paste it into the left editor. You can also click Upload to load a .toon or .txt file. The Sample button loads example data. Invalid TOON will show an error—use the TOON Validator to diagnose.
Check the Output
The right panel updates automatically. Valid TOON gets formatted with proper indentation. If there's a syntax error, you'll see an error message instead.
Copy or Download
Use Copy to put the result on your clipboard, or Download to save it as a file. For converting to JSON, use TOON to JSON. For the reverse, use JSON to TOON.
When TOON Formatting Helps
TOON is used when sending structured data to LLMs, AI APIs, or token-limited systems. Compared to JSON, TOON uses fewer tokens. If you receive minified TOON from an API or generate it programmatically, formatting it here makes the structure readable for debugging or review. The RFC 8259 JSON spec and YAML are related formats. Developers working with AI prompts and structured outputs often need to inspect TOON before or after processing.
Config and schema data in TOON format benefits from formatting before sharing with teammates. Running it through the TOON Validator first can catch syntax issues. For converting to JSON, YAML, or other formats, use the TOON converter tools.
Frequently Asked Questions
Is my data private?
Yes. Formatting runs entirely in your browser. No data is sent to any server. You can confirm this by opening your browser's Network tab while using the tool.
TOON vs JSON?
TOON is more compact and uses fewer tokens. JSON is universal and widely supported. Use TOON for LLM contexts; use JSON for general APIs and config.
Can I convert TOON to JSON?
Yes. Use the TOON to JSON tool. The conversion preserves structure and data.
What if my TOON is invalid?
The tool will show a parse error. Use the TOON Validator to get detailed error messages and fix syntax issues.
Does formatting change the data?
No. Only whitespace and indentation change. The structure and values stay the same. Formatted TOON is equivalent to the original.