Firebase Auth and localStorage

[Francisco Mateo]

I noticed while configuring my Vue app with Firebase that upon successful authentication, Firebase will set the user in localStorage.
The documentation does not mention this nor does the API reference.

I wanted to view the source of the auth module for more information...but it's minified: https://github.com/firebase/firebase-js-sdk/blob/master/src/auth.build.js

So, why is this done? 

[Bassam]

Hey Francisco, Auth state is saved in localStorage on majority of browsers, though it is saved in indexedDB for IE11 and Edge due to some issue with localStorage synchronization in those browsers.

This could change in the future.  

We have plans to open source the Auth library but it will come later this year.

Is there a specific question you have on this?

Best regards,

Bassam

[Christian Martin]

Any update on this one? I'm using cordova which stores the anonymous auth credentials inside localstorage. The problem is that IOS wipes out the localstorage when the device is low on space.

[Kato Richardson]

Hi Christian,

Anonymous auth is not really intended as a permanent auth method. It is, by definition, anonymous.

To make this permanent, there are a couple options:

1. The common approach: Offer the user an option such as "Want to make sure your data is never lost? Register now." and promote them to a phone, OAuth, or email/password account
2. Utilize a unique identifier you provide (some sort of device id or registration id) and sign your own tokens

☼, Kato

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