JSON to TOON MCP MCP server

This server converts JSON data to the compact TOON format, reducing token usage by approximately 40%, and decodes TOON back to JSON. It supports tools for converting documents and fixtures, useful for preparing prompts or RAG context without leaving the AI chat interface.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by json2toon.co

MCP endpoint (Streamable HTTP)

https://json2toon.co/api/mcp

Vendor documentation

What you can do with it

Convert JSON to TOON to reduce LLM token usage
Decode TOON back to pretty-printed JSON
Prepare compact data for prompts or RAG context

Tools advertised by the last live check:

json_to_toon
toon_to_json

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

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

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add json-to-toon-mcp --url https://json2toon.co/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable json-to-toon-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "json-to-toon-mcp": {
      "url": "https://json2toon.co/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "json-to-toon-mcp": {
      "type": "streamableHttp",
      "url": "https://json2toon.co/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start json-to-toon-mcp and inspect its tools.

VS Code configuration

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

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http json-to-toon-mcp https://json2toon.co/api/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "json-to-toon-mcp": {
      "url": "https://json2toon.co/api/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "json-to-toon-mcp": {
      "serverUrl": "https://json2toon.co/api/mcp"
    }
  }
}

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