Is a Firebase UID always 28 characters?
Solution 1
A Firebase developer had this to say on their forums:
I would not rely on a constant length for the UIDs forever. We chose the current value because it provides a big enough ID space while still being under the 36-character limit for Firebase Analytics user properties.
So, in other words, what you're suggesting may or may not fail in the future, so you probably should find a different way of implementing it that's more future-proof.
Solution 2
The uid of type string is used to assign to the newly created user. Must be a string between 1 and 128 characters long, inclusive. If not provided, a random uid will be automatically generated.
https://firebase.google.com/docs/auth/admin/manage-users
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Finlay Percy
Javascript and Firebase Developer at Folded Group. BSc Audio Technology Graduate from Bournemouth University
Updated on June 06, 2022Comments
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Finlay Percy almost 2 years
I am creating security rules for my Firebase project and wanted to add
UIDstring.length == 28
to my database rules. All of my users UIDs are 28 characters, but I wanted to check if they can be any longer or shorter?Thanks
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Hendy Irawan over 4 yearsmakes the most sense to me
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CoderUni over 3 yearsAlthough the length of the uid you can assign can be between 1 and 128 characters, this doesn't mean that the length of the auto-generated firebase uid will be between 1 and 128 characters. Look at the uid property in firebase.google.com/docs/auth/admin/manage-users#create_a_user
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Nikos over 3 yearsquite annoying if you concat uid's to make another key and depend on the length
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Muhammad Saqib over 2 yearsThis answer is helpful if you want to set varchar length of UID in your database. So now you know 128 is the max possible length.