# Does user\_id have specific format?

**URL:** <https://community.sendbird.com/t/does-user-id-have-specific-format/8967>\
**Category:** API\
**Tags:** chatsdk\
**Created:** [January 26, 2024, 12:17am UTC](https://community.sendbird.com/t/does-user-id-have-specific-format/8967 "2024-01-26T00:17:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Eueddem\_Kim](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/eueddem_kim/32/2007_2.png) [@Eueddem\_Kim](https://community.sendbird.com/u/Eueddem_Kim)\
**Post date:** [January 26, 2024, 12:17am UTC](https://community.sendbird.com/t/does-user-id-have-specific-format/8967/1 "2024-01-26T00:17:46Z")

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**[Question]**  
Hello,

I’d like to filter out Sendbird user ids from a random pile of strings. (please don’t ask why I need this ;D) - so, when you create an user by calling platform API’s `/users`, does returned `user_id` have any specific format? such as starting with some string + 3-8-4-4-12 characters.

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**Author:** ![Tyler](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/tyler/32/810_2.png) [@Tyler](https://community.sendbird.com/u/Tyler)\
**Post date:** [January 26, 2024, 3:05am UTC](https://community.sendbird.com/t/does-user-id-have-specific-format/8967/2 "2024-01-26T03:05:12Z")

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Hello @Eueddem_Kim,

`user_id` is a custom string provided by you at the time of creation so it would only have a standard format if you use one. Sendbird does not generate user\_ids.

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**Author:** ![Eueddem\_Kim](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/eueddem_kim/32/2007_2.png) [@Eueddem\_Kim](https://community.sendbird.com/u/Eueddem_Kim)\
**Post date:** [January 26, 2024, 5:05pm UTC](https://community.sendbird.com/t/does-user-id-have-specific-format/8967/3 "2024-01-26T17:05:01Z")

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Oh, thanks! I have to look into our service code more. 🙂