JSON to TOON

io.github.karta9821v1.0.0Updated Oct 5, 2026

Convert JSON to TOON (about 40% fewer LLM tokens) and TOON back to JSON. Free, no auth.

VerifiedStreamable HTTPWeb executableDeveloper Tools

Overview

AI-generated overview

Converts JSON data to TOON format, which uses fewer LLM tokens, and converts TOON back to JSON.

What it does
This remote MCP server provides conversion between JSON and TOON. According to its description, TOON uses roughly 40 percent fewer LLM tokens than JSON, and the server supports both directions: JSON to TOON and TOON back to JSON. It is a small, single-purpose utility rather than a general data platform.
When to use it
Use it when an assistant needs to shrink JSON payloads before sending them to a model, or when it needs to read TOON data and turn it back into JSON. It is a narrow formatting helper, not a replacement for data analysis or storage tools.
Requirements
A remote MCP endpoint at over streamable HTTP. The description states it is free and requires no authentication; no environment variables or headers are declared.
Before you install
The conversion runs on a third-party remote service, so any JSON or TOON content sent to it leaves the user's machine. The description says it is free and needs no auth, but no privacy or retention terms are provided, so avoid sending sensitive or confidential data.

Installation

In SourceWeft

  1. Open JSON to TOON in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Other MCP clients

Add this to your client's mcpServers config.

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

Tools

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Version history

1
  1. v1.0.0LatestOct 4, 2026