toolgrep / Developer productivity
json2toon.co
Browser-based converter that turns JSON, CSV, YAML, XML, TOML, and Protobuf into TOON or TONL, compact formats for LLM prompts.
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json2toon.co is a free online converter between JSON, TOON, TONL, CSV, YAML, XML, TOML, and Protobuf. TOON (Token-Oriented Object Notation) encodes the JSON data model with field names declared once and uniform arrays written as rows, reducing token counts in LLM prompts; the site reports about 43% fewer tokens than JSON on average (42.6% in the TOON v4.1 benchmark). All conversion runs client-side in the browser with no upload. The site also offers batch conversion with ZIP export, a free public REST API, a TypeScript library, a Chrome extension, an MCP server at https://json2toon.co/api/mcp, and browser JSON tools (JSON repair, JSONPath queries, JSON Schema validation, JWT decoding, diff and tree views).
- Category
- Developer productivity
- Pricing
- free
- Free tier
- yes
- API
- yes
- MCP server
- yes
- SDK
- yes
- Open source
- yes
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Listed 2026-10-25 · last verified 2026-10-25 · extracted by @cf/zai-org/glm-5.3-flash · confidence 0.9
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