# Link App Users to External Database

**URL:** <https://forum.adalo.com/t/link-app-users-to-external-database/4439>\
**Category:** Get Help\
**Created:** [September 28, 2020, 9:20pm UTC](https://forum.adalo.com/t/link-app-users-to-external-database/4439 "2020-09-28T21:20:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jade](https://avatars.discourse-cdn.com/v4/letter/j/a8b319/32.png) [@Jade](https://forum.adalo.com/u/Jade)\
**Post date:** [September 28, 2020, 9:20pm UTC](https://forum.adalo.com/t/link-app-users-to-external-database/4439/1 "2020-09-28T21:20:09Z")

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Hopefully soon I will be able to contribute rather than just ask questions… Is there a way to link people that’s signed up for the app to a database that already exists? I have a general understanding of API’s. But specifically. If John Doe signs up for the app, can I link him to John Doe that has previously signed up to my mailing list. I understand that I would probably have to import the external list to a database within Adalo.

Thanks in advance for your help!

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**Author:** ![anon78309838](https://avatars.discourse-cdn.com/v4/letter/a/b9bd4f/32.png) [@anon78309838](https://forum.adalo.com/u/anon78309838)\
**Post date:** [September 29, 2020, 8:28am UTC](https://forum.adalo.com/t/link-app-users-to-external-database/4439/2 "2020-09-29T08:28:03Z")

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There a 2 ways you could do this.

You could use [External Collections](https://help.adalo.com/integrations/external-collections-with-apis) to bring the external database in to Adalo.

You could use a [Custom Action](https://help.adalo.com/integrations/custom-actions) to query that API for the external database to check if that user exists and what their details are.

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**Author:** ![Jade](https://avatars.discourse-cdn.com/v4/letter/j/a8b319/32.png) [@Jade](https://forum.adalo.com/u/Jade)\
**Post date:** [September 29, 2020, 2:50pm UTC](https://forum.adalo.com/t/link-app-users-to-external-database/4439/3 "2020-09-29T14:50:17Z")

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Thanks, I’m not quite at that skill level yet, but soon!

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**Author:** ![system](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.adalo.com/system/32/40401_2.png) [@system](https://forum.adalo.com/u/system)\
**Post date:** [October 9, 2020, 2:50pm UTC](https://forum.adalo.com/t/link-app-users-to-external-database/4439/4 "2020-10-09T14:50:18Z")

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