# When creating a webhook, the error "Value isn't a string."

**URL:** <https://community.developer.atlassian.com/t/when-creating-a-webhook-the-error-value-isnt-a-string/50388>\
**Category:** Trello\
**Tags:** rest-api\
**Created:** [July 28, 2021, 2:35pm UTC](https://community.developer.atlassian.com/t/when-creating-a-webhook-the-error-value-isnt-a-string/50388 "2021-07-28T14:35:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![AndreiSkripnikov](https://avatars.discourse-cdn.com/v4/letter/a/f14d63/32.png) [@AndreiSkripnikov](https://community.developer.atlassian.com/u/AndreiSkripnikov)\
**Post date:** [July 28, 2021, 2:35pm UTC](https://community.developer.atlassian.com/t/when-creating-a-webhook-the-error-value-isnt-a-string/50388/1 "2021-07-28T14:35:15Z")

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Hello everyone, I am creating a webhook, but I ran into a problem when specifying the list ids in the idModel, the API returns the error “Value isn’t a string.”, Here is my request.

```auto
"description":"listener on first board",   
"idModel" : "60fffb08736bcf7bf0b0a3ae",    
"callbackUrl" : "https://8441a48e1030.ngrok.io/trello/",    
"key" : key,    
"token" : token

```

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<div class="post-metadata">

**Author:** ![bentley](https://sea1.discourse-cdn.com/atlassiandeveloper/user_avatar/community.developer.atlassian.com/bentley/32/36116_2.png) [@bentley](https://community.developer.atlassian.com/u/bentley)\
**Post date:** [July 28, 2021, 2:36pm UTC](https://community.developer.atlassian.com/t/when-creating-a-webhook-the-error-value-isnt-a-string/50388/2 "2021-07-28T14:36:23Z")

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> [@AndreiSkripnikov](#):
>
> I am creating a webhook

What are you using to make the HTTP request - Postman, node, fetch, etc.?

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<div class="post-metadata">

**Author:** ![jrfischer](https://sea1.discourse-cdn.com/atlassiandeveloper/user_avatar/community.developer.atlassian.com/jrfischer/32/40093_2.png) [@jrfischer](https://community.developer.atlassian.com/u/jrfischer)\
**Post date:** [August 18, 2021, 2:37am UTC](https://community.developer.atlassian.com/t/when-creating-a-webhook-the-error-value-isnt-a-string/50388/3 "2021-08-18T02:37:17Z")

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@AndreiSkripnikov - You could try using [this](https://trellowebhookmanager.com).

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**Author:** ![Feedbucket](https://sea1.discourse-cdn.com/atlassiandeveloper/user_avatar/community.developer.atlassian.com/feedbucket/32/46867_2.png) [@Feedbucket](https://community.developer.atlassian.com/u/Feedbucket)\
**Post date:** [December 26, 2021, 11:07am UTC](https://community.developer.atlassian.com/t/when-creating-a-webhook-the-error-value-isnt-a-string/50388/4 "2021-12-26T11:07:36Z")

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I had the same problem and solved it by using the key `callbackURL`. Note that it’s with capital `URL`.