MCP server

JSON to TOON

io.github.karta9821/json2toon

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

Convert JSON to TOON (about 43% fewer LLM tokens) and TOON back to JSON. Free, no auth.

Working at last checkAbout 196 tokens per request once connected2 tools

https://json2toon.co/api/mcp

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 2
Token cost: About 196 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 25 Oct 2026, 20:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http json2toon https://json2toon.co/api/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.json2toon]
url = "https://json2toon.co/api/mcp"

Gemini CLI

{"mcpServers":{"json2toon":{"httpUrl":"https://json2toon.co/api/mcp"}}}

Cursor

{"mcpServers":{"json2toon":{"url":"https://json2toon.co/api/mcp"}}}

VS Code

{"servers":{"json2toon":{"type":"http","url":"https://json2toon.co/api/mcp"}}}

Antigravity

agy mcp add json2toon https://json2toon.co/api/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"json2toon","server_url":"https://json2toon.co/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"json2toon","server_url":"https://json2toon.co/api/mcp"}

json_to_toon ~132 tokens
Convert JSON to TOON (Token-Oriented Object Notation), a compact format that uses about 43% fewer LLM tokens than JSON on average. Best for uniform arrays of objects.
toon_to_json ~64 tokens
Decode a TOON document back to pretty-printed JSON.

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