VAPI•4w ago

VAPI fix Failed to save workflow: each value in nodes.tool.server.credentialld must be a UUID

this issue im facing
i was building this ai mock interview prep tool by watching the youtube video and im currently stuck with this error in VAPI please help me

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Vapi Support BotAPP•11/27/25, 2:58 PM

To fix the error:
Create a custom credential in your VAPI dashboard, then use the generated UUID as your . Here’s how your tool server config should look (replace the UUID with your actual credential ID):

Make sure the is copied exactly from your dashboard after creating the credential.
For more details, see the VAPI server authentication docs.

Source:

Server authentication

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

uncertain-scarletOP•11/27/25, 3:11 PM

how to create custom credential in my VAPI dashboard please help me

uncertain-scarletOP•11/27/25, 3:12 PM

@Vapi Teamhow to create custom credential in my VAPI dashboard please help me

uncertain-scarletOP•11/27/25, 3:16 PM

@Vapi Support Bot how to create custom credential in my VAPI dashboard please help me

uncertain-scarletOP•11/27/25, 3:50 PM

@Duckie how to create custom credential in my VAPI dashboard please help me

Vapi Support BotAPP•11/27/25, 3:51 PM

To create a custom credential in your VAPI dashboard:

Go to your VAPI dashboard and navigate to Custom Credentials.
Click Create Credential, select Bearer Token (for most cases), enter a name and your API token, then save.
Copy the generated (UUID) and use it in your config:

For more details, see the VAPI server authentication docs.

Source:

Server authentication

rubber-blue•11/27/25, 4:07 PM

I have a same issue today. Yesterday was working fine, It happens for me when I add a new endcall node or api request or modify the existing one

uncertain-scarletOP•11/27/25, 4:15 PM

please help me @etrock

Rrubber-blue I have a same issue today. Yesterday was working fine, It happens for me when I ...

uncertain-scarletOP•11/27/25, 4:18 PM

yes same issue whenever i try to add the apirequest node it is showing this kinda error if u know the solution please please please help me out... i have my project presentation tommorow

rubber-blue•11/27/25, 4:19 PM

I have an open ticket too. Sadly I'dont know the solution. I created an Assistant and a tool right now

uncertain-scarletOP•11/27/25, 4:20 PM

is there any alternative for this?

uncertain-scarletOP•11/27/25, 4:20 PM

i was using post method to post my query into my project

rubber-blue•11/27/25, 4:22 PM

I use simple assistant not a workflow and created a custom tool to make and api call and added to the assistant

uncertain-scarletOP•11/27/25, 4:23 PM

but there are no tools available in the Vapi right?

brilliant-orange•11/29/25, 10:55 PM

Same issue here since couple days. When I want to add an API Request node or modify one. Seems a bug since new release

brilliant-orange•12/1/25, 10:57 PM

Here's a workaround. You can create a tool for the API call and replace the API Call Node in your flow with the tool.

SarthakAPP•12/2/25, 6:37 AM

Hi Sam,

To resolve the error with the API request node, you need to create and use a custom credential in your Vapi dashboard. Here's how you can create one:

Navigate to the Custom Credentials section in your Vapi dashboard.
Click on Create Credential.
Select the Bearer Token option, enter a name for your credential, and input your API token.
Save the credential and note the generated (UUID).

Once done, update your tool configuration to include the like this:

Make sure you copy the exactly from the dashboard. For more details on server authentication, you can check the VAPI server authentication docs.

moderate-tomato•12/5/25, 7:23 PM

Same issue

VAPI fix Failed to save workflow: each value in nodes.tool.server.credentialld must be a UUID

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