# Structured Data Tester — MCP tool `findutils:structured_data_tester`

Validate JSON-LD structured data (given directly or extracted from HTML <script type="application/ld+json"> blocks) and return, per detected schema.org type, the required and recommended properties that are present or missing, a pass flag, and rich-result eligibility for 15 supported types. Does not fetch URLs.

- Category: seo
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, no API keys, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/structured-data-tester/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/mcp/structured-data-tester/
- Same tool on the other surface: https://findutils.com/api/structured-data-tester/

## Connect

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/
```

Claude Desktop (`claude_desktop_config.json`):

```json
{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/"
    }
  }
}
```

## Call the tool (verified example)

```bash
curl -X POST https://mcp.findutils.com/ \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "structured_data_tester",
      "arguments": {
        "json_ld": "{\"@context\":\"https://schema.org\",\"@type\":\"Person\",\"name\":\"Jane Doe\"}"
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `json_ld` | string | no | A JSON-LD document: one object, an array of objects, or an object with @graph. Use this OR html. |
| `html` | string | no | HTML source. Every <script type="application/ld+json"> block is extracted and validated. |

Example arguments (verified):

```json
{
  "json_ld": "{\"@context\":\"https://schema.org\",\"@type\":\"Person\",\"name\":\"Jane Doe\"}"
}
```

Decoded `json_ld` argument (readability only — send it as a string):

```json
{
  "@context": "https://schema.org",
  "@type": "Person",
  "name": "Jane Doe"
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/structured-data-tester/execute \
  -H "Content-Type: application/json" \
  -d '{
    "json_ld": "{\"@context\":\"https://schema.org\",\"@type\":\"Person\",\"name\":\"Jane Doe\"}"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/structured-data-tester
```

Full REST reference: https://findutils.com/api/structured-data-tester/ · OpenAPI 3.1 spec: https://findutils.com/api/openapi.json

---
Full catalog: POST https://mcp.findutils.com/ with method `tools/list` · https://findutils.com/mcp/ · https://findutils.com/llms.txt