VAPI•8mo ago

Vapi agent is not parsing the results returned by a webhook

I have a vapi agent setup to check the existing calendar event and they are tied using webhook, I see vapi is invoking the tool to check the results and when results are returned it says no results found.

I have confirmed the same using webhook logs. Attaching documents containing all the information

Webhook results
Call log details
Build details

Please help out

Tool_call_result.docx565.95KB

extreme-purple•5/12/25, 3:49 PM

Make sure to set up Google Calendar correctly. Check that the webhook provides structured JSON responses with the right parameters. Verify that the time zones are consistent. Add error handling and test with sample data to ensure everything integrates well.

Eextreme-purple Make sure to set up Google Calendar correctly. Check that the webhook provides s...

dual-salmonOP•5/13/25, 7:20 PM

Is the response in json is mandatory?

Ddual-salmon Is the response in json is mandatory?

extreme-purple•5/14/25, 5:09 AM

Yes it's is!

Eextreme-purple Yes it's is!

dual-salmonOP•5/14/25, 6:00 AM

Ohok...let me check

Ddual-salmon Ohok...let me check

dual-salmonOP•5/18/25, 6:54 AM

@Kings_big

I tried with sending the json from n8n still vapi says did not find the results

dual-salmonOP•5/18/25, 6:55 AM

Here is the results screenshot from n8n

rn_image_picker_lib_temp_3b2eeb5a-fb51-4afd-9c01-a689e05eee27.jpg

extreme-purple•5/18/25, 6:57 AM

Vapi likely doesn’t recognize your n8n JSON response because the toolCallId is missing or incorrect, or the JSON structure is invalid, it must return a results array with a matching toolCallId and a result string.

https://youtu.be/Hacm4i4lBgc?si=tbp0yH5_v49T3jwN

YouTubeBryce Claudin

VAPI and n8n Integration Guide (EASY) 🔥

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