# Invalid input parameter: topic in api v1

**URL:** <https://devforum.zoom.us/t/invalid-input-parameter-topic-in-api-v1/855>\
**Category:** API and Webhooks\
**Created:** [January 4, 2018, 9:40pm UTC](https://devforum.zoom.us/t/invalid-input-parameter-topic-in-api-v1/855 "2018-01-04T21:40:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Virgil\_Lazar](https://avatars.discourse-cdn.com/v4/letter/v/b782af/32.png) [@Virgil\_Lazar](https://devforum.zoom.us/u/Virgil_Lazar)\
**Post date:** [January 4, 2018, 9:40pm UTC](https://devforum.zoom.us/t/invalid-input-parameter-topic-in-api-v1/855/1 "2018-01-04T21:40:00Z")

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Hi,

I’m getting following error when trying to create a new meeting and sending an empty string as topic:

{“error”:{“code”:300,“message”:“Invalid input parameter: topic”}}

I believe in the past, this used to work, the topic was getting the default value “\<Host Name\>'s Zoom Meeting”.

Is this something that has been changed lately in the api (I’m using v1)?

Thank you!

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**Author:** ![Joshua\_Woodward1](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/joshua_woodward1/32/1480_2.png) [@Joshua\_Woodward1](https://devforum.zoom.us/u/Joshua_Woodward1)\
**Post date:** [January 8, 2018, 6:27pm UTC](https://devforum.zoom.us/t/invalid-input-parameter-topic-in-api-v1/855/2 "2018-01-08T18:27:40Z")

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Try not passing topic at all, error might be sending an empty string

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**Author:** ![DeveloperBot](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/developerbot/32/12632_2.png) [@DeveloperBot](https://devforum.zoom.us/u/DeveloperBot)\
**Post date:** [August 21, 2020, 5:23pm UTC](https://devforum.zoom.us/t/invalid-input-parameter-topic-in-api-v1/855/3 "2020-08-21T17:23:19Z")

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Closed on August 21, 2020, 5:23pm UTC