# JSON to TOON (remote · json2toon.co)

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

- Trust score: 88/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-04

## Components

- remote · `json2toon.co`: 88/100 (this document), [markdown](https://verifymcp.io/servers/karta9821-json2toon/api-mcp.md), [page](https://verifymcp.io/servers/karta9821-json2toon/api-mcp)

## Channel facts

- Endpoint: `https://json2toon.co/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.1`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-04.

- **Endpoint Security**: 83/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 72/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 138 tokens (~69/item across 2 items; 2 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the JSON to TOON MCP server?

JSON to TOON is a hosted endpoint at https://json2toon.co/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http karta9821-json2toon 'https://json2toon.co/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "karta9821-json2toon": {
      "url": "https://json2toon.co/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "karta9821-json2toon": {
      "type": "http",
      "url": "https://json2toon.co/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.karta9821-json2toon]
url = "https://json2toon.co/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "karta9821-json2toon": {
      "type": "remote",
      "url": "https://json2toon.co/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add karta9821-json2toon --url 'https://json2toon.co/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  karta9821-json2toon:
    url: "https://json2toon.co/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "karta9821-json2toon": {
      "Transport": "http",
      "Url": "https://json2toon.co/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add karta9821-json2toon -t streamable-http -u 'https://json2toon.co/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "karta9821-json2toon": {
      "type": "http",
      "url": "https://json2toon.co/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-03 (score 88, 0)

- [security] Stability: 0.97 → pass

### 2026-11-02 (score 88, +1)

No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 87, +1)

No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 86, +1)

No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 85, +1)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 84, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 83, +1)

No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-20 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (2)

### `json_to_toon` (~75 tokens)

Convert JSON to TOON

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.

Input parameters:

- `delimiter` (string): Array delimiter (default comma)
- `json` (string, required): JSON document to convert (as a string)

### `toon_to_json` (~33 tokens)

Convert TOON to JSON

Decode a TOON document back to pretty-printed JSON.

Input parameters:

- `toon` (string, required): TOON document to decode

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/karta9821-json2toon/api-mcp#diagnostics

## Score history

- 2026-11-04: 88
- 2026-11-03: 88
- 2026-11-02: 88
- 2026-11-01: 87
- 2026-10-31: 87
- 2026-10-30: 86
- 2026-10-29: 86
- 2026-10-28: 85
- 2026-10-27: 85
- 2026-10-26: 84
- 2026-10-25: 84
- 2026-10-24: 84
- 2026-10-23: 83
- 2026-10-22: 83
- 2026-10-21: 82
- 2026-10-20: 82
- 2026-10-19: 81
- 2026-10-18: 81
- 2026-10-17: 80
- 2026-10-16: 80
- 2026-10-15: 78
- 2026-10-14: 78
- 2026-10-13: 77
- 2026-10-12: 77
- 2026-10-10: 76
- 2026-10-09: 75
- 2026-10-06: 75
- 2026-10-04: 74

## Common questions

### What is the JSON to TOON MCP server?

JSON to TOON is an MCP server listed in the public MCP registry as io.github.karta9821/json2toon. Convert JSON to TOON (about 43% fewer LLM tokens) and TOON back to JSON. Free, no auth. This page covers its hosted endpoint (https://json2toon.co/api/mcp).

### Is the JSON to TOON MCP server safe to use?

JSON to TOON scores 88 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the JSON to TOON MCP server expose?

JSON to TOON exposes 2 tools: json_to_toon, toon_to_json. Their descriptions and schemas cost roughly 108 tokens of context every time the server is loaded.

### Does the JSON to TOON MCP server require authentication?

No. We connected to JSON to TOON without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the JSON to TOON MCP server still maintained?

JSON to TOON is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://json2toon.co/api/mcp
- Website: https://json2toon.co/mcp
- Changelog RSS feed: https://verifymcp.io/servers/karta9821-json2toon/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/karta9821-json2toon/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/karta9821-json2toon/api-mcp