Max Length of autogenerated ID, and avoiding collisions with custom generated ID

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George Bittmann

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Jul 27, 2016, 12:38:49 PM7/27/16

to Google Identity Toolkit

It looks like the ID returned by getUserId() is typically 28 characters. What is the max length?

What is the best practice for avoiding collisions with the ID value if you need to use uploadUsers() to create users?

Jin Liu

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Jul 27, 2016, 3:25:19 PM7/27/16

to Google Identity Toolkit

Hi George,

The auto generated user ID length could be increased in future, but you can safely assume it will not exceed 256 bytes.

If your existing user ID length is less than 25 characters, then there will no be collisions with auto generated IDs. You may also insert a prefix (e.g. 'my-app-') to the user id when uploading users.