JSON to TOON Converter
Convert JSON to TOON (Token-Oriented Object Notation) - A token-efficient format for LLMs
JSON Input
TOON Output
What Is JSON to TOON?
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. The JSON specification defines the source format.
This tool converts JSON to TOON. Conversion runs entirely in your browser. Nothing is sent to a server. The output is optimized for AI models and APIs with token limits. For the reverse, use TOON to JSON.
JSON to TOON Examples
Convert JSON to TOON for token efficiency. Telecom-themed example:
Example: Subscriber records
TOON output:
Click the Sample button above to load more examples into the editor.
How to Use This Tool
Paste or Upload JSON
Copy your JSON and paste it into the left editor. You can also click Upload to load a .json or .txt file. The Sample button loads example data. Invalid JSON will show an error.
Review the TOON Output
The right panel shows the converted TOON. The structure is preserved; the output uses fewer tokens than equivalent JSON. For formatting JSON first, use the JSON Formatter.
Copy or Download
Use Copy or Download. For formatting JSON first, use the JSON Formatter. For validation, use the JSON Validator.
When JSON to TOON Helps
When sending structured data to LLMs, AI APIs, or token-limited systems, every token counts. TOON reduces token usage compared to JSON. The RFC 8259 defines JSON. If your source data is JSON (e.g. from an API, config file, or database), converting here gives you compact TOON for prompts and AI inputs.
RAG pipelines, tool-calling schemas, and structured output formats often benefit from TOON. Converting JSON config or schema to TOON before sending to an LLM can save tokens and improve response quality. For pulling out specific values from large JSON first, use the JSON Path tool.
Frequently Asked Questions
When to use TOON?
When you need to send structured data to LLMs and want to minimize token usage. TOON is more compact than JSON. Use JSON for general APIs; use TOON for AI and token-limited contexts.
Is my data private?
Yes. Conversion runs entirely in your browser. No data is sent to any server. You can confirm this by opening your browser's Network tab.
How much smaller is TOON?
TOON typically uses fewer tokens than JSON due to shorter syntax. The exact savings depend on the data. For nested structures and large payloads, the difference can be significant.
Can I convert TOON back to JSON?
Yes. Use the TOON to JSON tool. The conversion is lossless in both directions.
Does it work with all JSON?
Yes. Standard JSON objects, arrays, strings, numbers, and booleans convert to TOON. The structure is preserved. Invalid JSON will show an error.