# Avoid Username Duplicate

**URL:** <https://forum.adalo.com/t/avoid-username-duplicate/39158>\
**Category:** External Collections, Custom Actions & Collections\
**Created:** [May 23, 2023, 2:52am UTC](https://forum.adalo.com/t/avoid-username-duplicate/39158 "2023-05-23T02:52:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rfaienza](https://avatars.discourse-cdn.com/v4/letter/r/22d042/32.png) [@rfaienza](https://forum.adalo.com/u/rfaienza)\
**Post date:** [May 23, 2023, 2:52am UTC](https://forum.adalo.com/t/avoid-username-duplicate/39158/1 "2023-05-23T02:52:03Z")

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I’m creating an app that requires users to sign up with a username and email. How can i avoid duplicate usernames. I created a modal where it is visible when "users all count is greater or equal to 1. With a filter of usernames equal input “usernames”

 ![Screenshot 2023-05-22 at 10.51.44 PM](https://us1.discourse-cdn.com/flex020/uploads/adalo/original/3X/2/c/2ce5b383e21275956dd5215fb8966a0307294e17.png)

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**Author:** ![Victor](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.adalo.com/victor/32/2054_2.png) [@Victor](https://forum.adalo.com/u/Victor)\
**Post date:** [May 23, 2023, 8:05am UTC](https://forum.adalo.com/t/avoid-username-duplicate/39158/2 "2023-05-23T08:05:16Z")

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Hi @rfaienza,

These 2 relatively old videos might be useful for you:

[![](https://us1.discourse-cdn.com/flex020/uploads/adalo/original/3X/5/3/53755e4410e0a168563f903b53a1662bf1664e06.jpeg "Adalo Hints: how to prevent from creating duplicate records in the collection") ](https://www.youtube.com/watch?v=5ybmmRBTlvo)

[![](https://us1.discourse-cdn.com/flex020/uploads/adalo/original/3X/9/3/937ccbf30b9d5fe4f5ee7a86179300ca478bcc1e.jpeg "Adalo hints: Follow-up for "prevent from creating duplicates" video: modal with warning") ](https://www.youtube.com/watch?v=itGUQrN6gfI)

They don’t answer your question directly but might give a hint about the approach you should use. Also, please keep in mind that it is better not to use conditional actions upon user signup, as they might not work as expected.

Best,  
Victor.