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Question

Failed to create a form in HubSpot Invalid input JSON on line 1, column 336: Cannot deserialize value of type `java.lang.String` from Array value (token `JsonToken.START_ARRAY`)

  • September 18, 2025
  • 3 replies
  • 45 views
L

I’m trying to connect my Webflow form to HubSpot using Zapier.
The data flows correctly between Webflow, Zapier, and even Slack — so the integrations are working.
But when the data is sent to HubSpot, I get this error and the submission doesn’t go through:

Error:

Failed to create a form in HubSpot
Invalid input JSON on line 1, column 336: 
Cannot deserialize value of type `java.lang.String` 
from Array value (token `JsonToken.START_ARRAY`)


Form Details :

 

This post has been edited by a moderator to remove personally identifiable information (PII). Please remember that this is a public forum and avoid sharing personal or potentially sensitive details.

This post has been closed for comments. Please create a new post if you need help or have a question about this topic.

3 replies

Sparsh from Automation Jinn
Forum|alt.badge.img+6

Hey ​@LabLabee,

You are sending an array instead of a string for one of the column in Create Form Submission action. Please verify and convert it to string using Formatter by Zapier. You can use something like Formatter → Utilities → Line-item to Text. See more about it here- https://help.zapier.com/hc/en-us/articles/8496308258189-Convert-line-items-into-text-strings. If it doesn’t fix, please post all the configuration screenshots of Create Form Submission action. Hope it helps!

https://zapier.com/partnerdirectory/automation-jinn | Zapier Silver Solution Partner| Automationjinn.com
L
  • LabLabee
  • Author
  • New
  • 1 reply
  • September 18, 2025

I tried using the formatter on 3 lines that had a drop down but still giving me the same issue!
 


 

Hey ​@LabLabee,

You are sending an array instead of a string for one of the column in Create Form Submission action. Please verify and convert it to string using Formatter by Zapier. You can use something like Formatter → Utilities → Line-item to Text. See more about it here- https://help.zapier.com/hc/en-us/articles/8496308258189-Convert-line-items-into-text-strings. If it doesn’t fix, please all the configuration screenshots of Create Form Submission action. Hope it helps!

 

 

Troy Tessalone
Zapier Orchestrator & Solution Partner
Forum|alt.badge.img+14
  • Troy TessaloneZapier Orchestrator & Solution Partner
  • Zapier Orchestrator & Solution Partner
  • 34066 replies
  • September 18, 2025

Hi ​@LabLabee 

Help links that covers the expected values for dropdown field types in Zap steps: https://help.zapier.com/hc/en-us/articles/8496241696141-Add-custom-values-to-dropdown-menu-fields-in-Zaps

 

 

⚡ Troy Tessalone - AutomationAce.com | Platinum Authorized Zapier Solution Partner | #1 Zapier Community Contributor
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