Invalid characters in user_name when receiving event notifications

Sometimes we see a large number of invalid characters in the user_name field in the event notifications we receive from Zoom. This happens occasionally and is not easily reproducible. See a sample event notification below ( host_id and account_id intentionally Xed out):

zoom event request: {“event”:“meeting.sharing_started”,“payload”:{“object”:{“uuid”:“PQJnznlcTHWMByal4bv5PA==”,“participant”:{“id”:"",“user_id”:“16778240”,“user_name”:“Xiw\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000”,“sharing_details”:{“link_source”:"",“file_link”:"",“source”:"",“date_time”:“2019-09-26T22:08:09Z”,“content”:“application”}},“id”:“2753518025”,“type”:4,“topic”:“Rich’s Personal Meeting Room”,“host_id”:“XXXXXXXXXXXXXXXXXXXXXXXXX”,“duration”:0,“start_time”:“2019-09-26T22:03:26Z”,“timezone”:“America/Los_Angeles”},“account_id”:“XXXXXXXXXXXXXXXXXX”}}

Is this a known issue?

Hi @ps40,

Happy to help,

When making the above request, can you let us know what the “user_name” was? Did it include any special characters?


The username is Rich Sutton. There are no special characters in the name.

Is it possible that Zoom reuses user_ids?

Hey @ps40,

We will look into the logs and see why this is happening. JIRA: ZOOM-112804

It is odd that the "id":"" is blank, it makes me think the user is not signed in who is sharing the screen.


Can you please comment on the other issue also? We are seeing same ids being used for different ( non-logged in users). Does Zoom reuse user_ids?

Hey @ps40,

For the Meeting Sharing Started Webhook, the user_id is a unique participant identifier for a meeting instance. It is possible it can be reused in a new meeting.

The id on the other hand, is unique to every Zoom user regardless of the meeting.


Let me know if that answers your question! :slight_smile:



Could you please let me know if there is an update on this issue?


Hey @ps40,

We are still investigating and working on the issue. We are hoping to include a fix in one of our next releases.

Thanks for your patience,