# Query String Stringify — MCP tool `findutils:query_string_stringify`

Serialise an object into a URL query string. Array values repeat the key. Null/undefined values are skipped. Set prefix=true to include the leading "?".

- Category: encoding
- 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/query-string-stringify/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/mcp/query-string-stringify/
- Same tool on the other surface: https://findutils.com/api/query-string-stringify/

## 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": "query_string_stringify",
      "arguments": {
        "params": {
          "a": "1",
          "b": "2"
        }
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `params` | object | yes | Key-value object. Values may be strings, numbers, booleans, or arrays. |
| `prefix` | boolean | no | If true, prepend "?". Default: false. |

Example arguments (verified):

```json
{
  "params": {
    "a": "1",
    "b": "2"
  }
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/query-string-stringify/execute \
  -H "Content-Type: application/json" \
  -d '{
    "params": {
      "a": "1",
      "b": "2"
    }
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/query-string-stringify
```

Full REST reference: https://findutils.com/api/query-string-stringify/ · 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