How to implement login and password saving in mobile applications?

Question

Mobile development

In any application, when you enter your login and password, the phone saves it and in the future you can log in using face id or touch id .
What needs to be done to make this functionality work in the application?
I have a vue quasar app.
I am using cordova to build the app.

Answer 1

On iOS, you can save the login and password (or token) in a keychain (keychain), as an option. This is something like an encrypted storage of all sorts of keys and passwords. There is a plugin for Cordova - https://www.npmjs.com/package/cordova-plugin-ios-k...
Something similar should also be on Android.

Answer 2

Use localStorage to store authorization data (it's better to store the authorization token).
When opening the application, check the data in localStorage, if there is data and it is valid, then run the Touch Id check, if not, redirect to the authorization page.
Touch Id Plugin
https://github.com/EddyVerbruggen/cordova-plugin-t...