diff --git a/Ads-REST-Services/Ads.Common/Ads.Common.csproj b/Ads-REST-Services/Ads.Common/Ads.Common.csproj
index e0b0888..de8b855 100644
--- a/Ads-REST-Services/Ads.Common/Ads.Common.csproj
+++ b/Ads-REST-Services/Ads.Common/Ads.Common.csproj
@@ -34,6 +34,7 @@
     <Reference Include="System.Core" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="CollectionExtensions.cs" />
     <Compile Include="QueryableExtensions.cs" />
   </ItemGroup>
   <ItemGroup>
diff --git a/Ads-REST-Services/Ads.Common/CollectionExtensions.cs b/Ads-REST-Services/Ads.Common/CollectionExtensions.cs
new file mode 100644
index 0000000..ca1623a
--- /dev/null
+++ b/Ads-REST-Services/Ads.Common/CollectionExtensions.cs
@@ -0,0 +1,12 @@
+namespace Ads.Common
+{
+    using System.Collections.Generic;
+
+    public static class CollectionExtensions
+    {
+        public static IEnumerable<T> ToEnumerable<T>(this IEnumerable<T> collection)
+        {
+            return collection;
+        }
+    }
+}
diff --git a/Ads-REST-Services/Ads.Web/Controllers/CategoriesController.cs b/Ads-REST-Services/Ads.Web/Controllers/CategoriesController.cs
index 136335d..589e02a 100644
--- a/Ads-REST-Services/Ads.Web/Controllers/CategoriesController.cs
+++ b/Ads-REST-Services/Ads.Web/Controllers/CategoriesController.cs
@@ -4,6 +4,10 @@
     using System.Linq;
     using System.Web.Http;
 
+    using Newtonsoft.Json;
+    using System.Web.Http.Results;
+
+    using Ads.Common;
     using Ads.Data;
     using Ads.Models;
 
@@ -22,10 +26,10 @@ public CategoriesController(IAdsData data)
         // GET api/Categories
         /// <returns>List of all categories sorted by Id</returns>
         [HttpGet]
-        public IEnumerable<Category> GetCategories()
+        public JsonResult<IEnumerable<Category>> GetCategories()
         {
-            var categories = this.Data.Categories.All().OrderBy(category => category.Id).ToList();
-            return categories;
+            var categories = this.Data.Categories.All().OrderBy(category => category.Id).ToEnumerable();
+            return Json(categories, new JsonSerializerSettings());
         }
     }
 }
diff --git a/Ads-REST-Services/Ads.Web/Controllers/TownsController.cs b/Ads-REST-Services/Ads.Web/Controllers/TownsController.cs
index 7fb68fb..360582b 100644
--- a/Ads-REST-Services/Ads.Web/Controllers/TownsController.cs
+++ b/Ads-REST-Services/Ads.Web/Controllers/TownsController.cs
@@ -4,6 +4,10 @@
     using System.Linq;
     using System.Web.Http;
 
+    using Newtonsoft.Json;
+    using System.Web.Http.Results;
+
+    using Ads.Common;
     using Ads.Data;
     using Ads.Models;
 
@@ -22,10 +26,10 @@ public TownsController(IAdsData data)
         // GET api/Towns
         /// <returns>List of all towns sorted by Id</returns>
         [HttpGet]
-        public IEnumerable<Town> GetTowns()
+        public JsonResult<IEnumerable<Town>> GetTowns()
         {
-            var towns = this.Data.Towns.All().OrderBy(town => town.Id).ToList();
-            return towns;
+            var towns = this.Data.Towns.All().OrderBy(town => town.Id).ToEnumerable();
+            return Json(towns, new JsonSerializerSettings());
         }
     }
 }