Secure Local Storage in Flutter

Question

write,read, delete all data from localstorage
secure-local-storage-in-flutter
Flutter - How to save data locally?
flutter-how-to-save-data-locally

how-to-save-to-web-local-storage-in-flutter-web
https://stackoverflow.com/questions/56417667/how-to-save-to-web-local-storage-in-flutter-web
Reading,Writing,Deleting api data in local-storage-in-flutter-web
securing-local-storage-flutter

Coding example of secure storage

Secure Local Storage in Flutter

Implementation

We will use a flutter plugin called flutter_secure_storage .

Add the following to your pubspec.yaml file:

dependencies:
  ...
  flutter_secure_storage: ^4.2.0

Check for the latest version on the plugin's page.

Configure Android Version

In [project]/android/app/build.gradle set minSdkVersion to >= 18.
android {
  ...
  defaultConfig {
    ...
    minSdkVersion 18
    ...
  }
}

Create Instance

Import flutter_secure_storage in your file and create an instance of it.

import 'package:flutter_secure_storage/flutter_secure_storage.dart';

FlutterSecureStorage _localStorage = new FlutterSecureStorage();

Write Data

To insert a key-value pair in the storage, we will use the write method.
We need to pass key and value to this method.

await _localStorage.write(key: key, value: value);

key and value should be a string.
If the key already exists, the value will get replaced.
If we pass a null value and the key already exists, it will get deleted.
Its return type is void.

Read Data

To read a value for a particular key, we will use the read method.
We need to pass the key to this method.

await _localStorage.read(key: key);

key should be a string.
If the key exists, the value will be returned.
If the key doesn't exist the null will be returned.
Its return type is always a string.

Read All Data

To read all the values, we will use the readAll method.

await _localStorage.readAll();

It will return all the key-value pairs as a Map.

Delete Data

To delete an entry, we will use the delete method.
We need to pass the key to this method.

await _localStorage.delete(key: key);

key should be a string.
Its return type is void.

Delete All Data

To delete all entries, we will use the deleteAll method.

await _localStorage.deleteAll();

Its return type is void.

Coding example of flutter secure storage

save the data using flutter secure storage dependency

  final secureStorage = FlutterSecureStorage();
     await secureStorage.write(key: 'orgRoleId', value: orgRoleId.toString()); // Save orgRoleId

Get data using flutter secure storage

  final orgSlug = widget.orgSlug;
     final secureStorage = FlutterSecureStorage();
  final orgRoleId = await secureStorage.read(key: 'orgRoleId');

     setState(() {
      _userRole = determineUserRole(orgRoleId); // Use the mixin to determine the role
    });