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Presentation/HushianWebApp/Service/LocalStorageService.cs

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+using Microsoft.JSInterop;
+using System.Text.Json;
+
+namespace HushianWebApp.Services
+{
+    public interface ILocalStorageService
+    {
+        Task<T> GetItem<T>(string key);
+        Task SetItem<T>(string key, T value);
+        Task RemoveItem(string key);
+    }
+
+    public class LocalStorageService : ILocalStorageService
+    {
+        private IJSRuntime _jsRuntime;
+
+        public LocalStorageService(IJSRuntime jsRuntime)
+        {
+            _jsRuntime = jsRuntime;
+        }
+
+        public async Task<T> GetItem<T>(string key)
+        {
+            var json = await _jsRuntime.InvokeAsync<string>("localStorage.getItem", key);
+
+            if (json == null)
+                return default;
+
+            return JsonSerializer.Deserialize<T>(json);
+        }
+
+        public async Task SetItem<T>(string key, T value)
+        {
+            await _jsRuntime.InvokeVoidAsync("localStorage.setItem", key, JsonSerializer.Serialize(value));
+        }
+
+        public async Task RemoveItem(string key)
+        {
+            await _jsRuntime.InvokeVoidAsync("localStorage.removeItem", key);
+        }
+    }
+}