# json2toon.co

> Free browser-based converter for JSON, CSV, YAML, XML, and TOML to TOON and TONL for LLM workflows.

json2toon.co helps developers convert structured data into compact formats that are easier to fit into LLM context windows. The main web app runs client-side in the browser, so data stays on the user's device during conversion.

Last updated: 2026-04-21

## Primary entry points
- / : online converter
- /docs/toon : TOON format guide
- /docs/tonl : TONL format guide
- /faq : privacy, formats, and token-saving FAQ
- /api-docs : public API reference
- /installations/typescript : TypeScript and JavaScript installation guide
- /blog : articles about TOON, TONL, LLM token optimization, and AI cost reduction

## Supported formats
- JSON
- TOON
- TONL
- CSV
- YAML
- XML
- TOML
- Protobuf

## Product facts
- Free online web converter
- Client-side browser processing for the main web tool
- Useful for prompt optimization, RAG context packing, and structured data inspection
- Public API available at /api/v1/toon with rate limits
- Official TOON library docs and installation guides available on-site

## Best pages for citations
- /docs/toon
- /docs/tonl
- /blog/what-is-toon
- /blog/json-vs-toon
- /blog/optimize-api-costs
- /blog/optimizing-rag-pipelines-with-toon

## Pricing
- Web converter: free
- API: see /api-docs for current usage details and limits