# Jwt Security Validator — MCP tool `findutils:jwt_security_validator`

Decode a JWT and return a list of security checks (algorithm strength, expiration, not-before, issued-at, issuer, audience, subject, signature presence) plus an overall valid flag. Does NOT verify the signature — it only inspects claims and header fields.

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

## 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": "jwt_security_validator",
      "arguments": {
        "token": "eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ4In0.sig"
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `token` | string | yes | The JWT to inspect (three dot-separated base64url segments). |
| `now` | integer | no | Unix timestamp (seconds) to evaluate time claims against. Default: current time. |

Example arguments (verified):

```json
{
  "token": "eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ4In0.sig"
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/jwt-security-validator/execute \
  -H "Content-Type: application/json" \
  -d '{
    "token": "eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ4In0.sig"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/jwt-security-validator
```

Full REST reference: https://findutils.com/api/jwt-security-validator/ · 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