How to save to web local storage in flutter web

You can use window.localStorage from dart:html

import 'dart:html';class IdRepository {  final Storage _localStorage = window.localStorage;  Future save(String id) async {    _localStorage['selected_id'] = id;  }  Future<String> getId() async => _localStorage['selected_id'];  Future invalidate() async {    _localStorage.remove('selected_id');  }}

shared_preferences dart package now supports local storage for the web from version 0.5.4.7+

Similar to shared preference on Android and iOS, the following is the code snippet for local storage on web

import 'package:flutter/material.dart';import 'package:shared_preferences/shared_preferences.dart'; // rememeber to import shared_preferences: ^0.5.4+8void main() {  runApp(MaterialApp(    home: Scaffold(      body: Center(      child: RaisedButton(        onPressed: _incrementCounter,        child: Text('Increment Counter'),        ),      ),    ),  ));}_incrementCounter() async {  SharedPreferences prefs = await SharedPreferences.getInstance();  int counter = (prefs.getInt('counter') ?? 0) + 1;  print('Pressed $counter times.');  await prefs.setInt('counter', counter);}

With flutter 1.10 we can use universal_html package:

import 'package:universal_html/html.dart';// ...// read preferencevar myPref = window.localStorage['mypref'];// ...// write preferencewindow.localStorage['mypref'] = myPref;