flutter_secure_storage on mobile should be your first and only choice. It uses the proper Keychain API on iOS and it encrypts the data , stores the encrypted data in SharedPreferences and the cryptographic key is stored in the Android KeyStore, which is a safe approach.29 Nis 2020
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A JWT needs to be stored in a safe place inside the user’s browser . If you store it inside localStorage, it’s accessible by any script inside your page. This is as bad as it sounds; an XSS attack could give an external attacker access to the token.
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