mute-gold•3d ago

How to Send Workflow Variables via API Request or Custom Tool to Server in Vapi.ai

I’m building a workflow with Vapi.ai. I have variables, but I can’t send them to my Node.js server using an API request. In the first node of the workflow, I capture a serviceName value. How can I send this serviceName to my server in the next node using an apiRequest? How should the properties inside the request body be structured? Workflow JSON { "name": "apiRequest_1756210376400", "type": "tool", "metadata": { "position": { "x": 626.6751012694067, "y": 1241.3795052333332 } }, "tool": { "type": "apiRequest", "function": { "name": "api_request_tool", "description": "API request tool", "parameters": { "type": "object", "properties": {}, "required": [] } }, "messages": [ { "type": "request-start", "blocking": false } ], "name": "apiRequestCall", "url": "https://8939cea92549.ngrok-free.app/api/callinfo", "method": "POST", "body": { "type": "object", "required": [ "serviceName" ], "properties": { "serviceName": { "type": "string", "default": "{{serviceName}}", "description": "Service Name Value" } } }, "variableExtractionPlan": { "schema": { "type": "object", "required": [], "properties": {} }, "aliases": [] } } }