JSON String Validator via Webhook

This n8n template provides a simple yet powerful utility for validating if a given string input is a valid JSON format. You can use this to pre-validate data received from external sources, ensure data integrity before further processing, or provide immediate feedback to users submitting JSON strings. 🔧 How it works Webhook: This node acts as the entry point for the workflow, listening for incoming POST requests. It expects a JSON body with a single property: jsonString: The string that you want to validate as JSON. Code (JSON Validator): This node contains custom JavaScript code that attempts to parse the jsonString provided in the webhook body. If the jsonString can be successfully parsed

Help me set up the n8n workflow "JSON String Validator via Webhook" (https://n8n.io/workflows/4704). It uses: Code. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.