WebhookによるJSON文字列の検証

• •HTTP Webhookエンドポイント（n8nが自動生成）

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        "content": "## Webhook Input\n\nThis node listens for incoming POST requests. It expects a JSON body containing a single property: `jsonString` (the string you wish to validate as JSON)."
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        "content": "## JSON Validation Logic\n\nThis node contains custom JavaScript code to parse the `jsonString` from the webhook input. It returns `valid: true` if successful, or `valid: false` with an `error` message if parsing fails."
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        "content": "## Webhook Response\n\nThis node sends the validation result (whether the `jsonString` was valid JSON or not, including an error if applicable) back to the system that triggered the webhook."
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