# Zoom User IDs and Uniqueness

**URL:** <https://devforum.zoom.us/t/zoom-user-ids-and-uniqueness/51552>\
**Category:** Web\
**Created:** [June 1, 2021, 6:18pm UTC](https://devforum.zoom.us/t/zoom-user-ids-and-uniqueness/51552 "2021-06-01T18:18:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![victor.aprea](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/victor.aprea/32/26777_2.png) [@victor.aprea](https://devforum.zoom.us/u/victor.aprea)\
**Post date:** [June 1, 2021, 6:18pm UTC](https://devforum.zoom.us/t/zoom-user-ids-and-uniqueness/51552/1 "2021-06-01T18:18:54Z")

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When I make this call:

```auto
const res = await this.client.join(
        topic,
        signature,
        zoomName,
      );

```

I get back `res.userId` on success.

I have found some evidence that two calls with different topics and zoomNames can result in the same res.userId. Does that claim have any merit or am I supposed to be able to rely on that not being the case?

---

<div class="post-metadata">

**Author:** ![tommy](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tommy/32/72769_2.png) [@tommy](https://devforum.zoom.us/u/tommy)\
**Post date:** [June 4, 2021, 7:31pm UTC](https://devforum.zoom.us/t/zoom-user-ids-and-uniqueness/51552/2 "2021-06-04T19:31:29Z")

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Hey @victor.aprea ,

> [@victor.aprea](#):
>
> I have found some evidence that two calls with different topics and zoomNames can result in the same res.userId. Does that claim have any merit or am I supposed to be able to rely on that not being the case?

That should not happen, the userId should be unique per. Perhaps you had the same userName join multiple times?

Thanks,  
Tommy

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [July 5, 2021, 5:31am UTC](https://devforum.zoom.us/t/zoom-user-ids-and-uniqueness/51552/3 "2021-07-05T05:31:58Z")

</div>

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