diff --git a/backend/src/Designer/Controllers/AppDevelopmentController.cs b/backend/src/Designer/Controllers/AppDevelopmentController.cs
index f64e8bd0fa6..37159b127f3 100644
--- a/backend/src/Designer/Controllers/AppDevelopmentController.cs
+++ b/backend/src/Designer/Controllers/AppDevelopmentController.cs
@@ -24,6 +24,7 @@ namespace Altinn.Studio.Designer.Controllers
     /// <summary>
     /// Controller containing actions that concerns app-development
     /// </summary>
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
     [Route("designer/api/{org}/{app:regex(^(?!datamodels$)[[a-z]][[a-z0-9-]]{{1,28}}[[a-z0-9]]$)}/app-development")]
@@ -57,6 +58,7 @@ public AppDevelopmentController(IAppDevelopmentService appDevelopmentService, IR
         /// Default action for the designer.
         /// </summary>
         /// <returns>default view for the app builder.</returns>
+        [HttpGet]
         [Route("/editor/{org}/{app:regex(^[[a-z]]+[[a-zA-Z0-9-]]+[[a-zA-Z0-9]]$)}/{*AllValues}")]
         public async Task<IActionResult> Index(string org, string app)
         {
diff --git a/backend/src/Designer/Controllers/ConfigController.cs b/backend/src/Designer/Controllers/ConfigController.cs
index 2ae7f2bec4f..a848e1c16f7 100644
--- a/backend/src/Designer/Controllers/ConfigController.cs
+++ b/backend/src/Designer/Controllers/ConfigController.cs
@@ -13,6 +13,7 @@ namespace Altinn.Studio.Designer.Controllers
     /// <summary>
     /// Controller exposing endpoints that handle metadata in config.json
     /// </summary>
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
     [Route("designer/api/{org}/{app:regex(^(?!datamodels$)[[a-z]][[a-z0-9-]]{{1,28}}[[a-z0-9]]$)}/config")]
diff --git a/backend/src/Designer/Controllers/DatamodelsController.cs b/backend/src/Designer/Controllers/DatamodelsController.cs
index 12e8874da6d..e6b0f444456 100644
--- a/backend/src/Designer/Controllers/DatamodelsController.cs
+++ b/backend/src/Designer/Controllers/DatamodelsController.cs
@@ -24,6 +24,7 @@ namespace Altinn.Studio.Designer.Controllers
     /// <summary>
     /// Controller containing all actions related to data modelling
     /// </summary>
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
     [Route("designer/api/{org}/{repository:regex(^(?!datamodels$)[[a-z]][[a-z0-9-]]{{1,28}}[[a-z0-9]]$)}/datamodels")]
diff --git a/backend/src/Designer/Controllers/EnvironmentsController.cs b/backend/src/Designer/Controllers/EnvironmentsController.cs
index 44824cfc939..59d003d3f48 100644
--- a/backend/src/Designer/Controllers/EnvironmentsController.cs
+++ b/backend/src/Designer/Controllers/EnvironmentsController.cs
@@ -5,15 +5,14 @@
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 
-
 namespace Altinn.Studio.Designer.Controllers
 {
     /// <summary>
     /// This is the API controller for functionality related to environments.
     /// </summary>
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
-
     public class EnvironmentsController : ControllerBase
     {
         private readonly IEnvironmentsService _environmentsService;
diff --git a/backend/src/Designer/Controllers/FeedbackFormController.cs b/backend/src/Designer/Controllers/FeedbackFormController.cs
index cfe76ff6f9b..c09fcea166b 100644
--- a/backend/src/Designer/Controllers/FeedbackFormController.cs
+++ b/backend/src/Designer/Controllers/FeedbackFormController.cs
@@ -6,7 +6,6 @@
 using Altinn.Studio.Designer.TypedHttpClients.Slack;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.AspNetCore.Routing;
 
 namespace Altinn.Studio.Designer.Controllers;
 
diff --git a/backend/src/Designer/Controllers/ImageController.cs b/backend/src/Designer/Controllers/ImageController.cs
index fbbd9a24fd5..a7597ce168a 100644
--- a/backend/src/Designer/Controllers/ImageController.cs
+++ b/backend/src/Designer/Controllers/ImageController.cs
@@ -19,6 +19,7 @@ namespace Altinn.Studio.Designer.Controllers;
 /// <summary>
 /// Controller containing actions related to images
 /// </summary>
+[ApiController]
 [Authorize]
 [AutoValidateAntiforgeryToken]
 [Route("designer/api/{org}/{app:regex(^(?!datamodels$)[[a-z]][[a-z0-9-]]{{1,28}}[[a-z0-9]]$)}/images")]
diff --git a/backend/src/Designer/Controllers/OptionsController.cs b/backend/src/Designer/Controllers/OptionsController.cs
index 56f23452ce0..4bbd2a4463c 100644
--- a/backend/src/Designer/Controllers/OptionsController.cs
+++ b/backend/src/Designer/Controllers/OptionsController.cs
@@ -161,7 +161,7 @@ public async Task<ActionResult<List<RefToOptionListSpecifier>>> GetOptionListsRe
     [ProducesResponseType(StatusCodes.Status200OK)]
     [ProducesResponseType(StatusCodes.Status400BadRequest)]
     [Route("{optionsListId}")]
-    public async Task<ActionResult<Dictionary<string, List<Option>>>> CreateOrOverwriteOptionsList(string org, string repo, [FromRoute] string optionsListId, [FromBody] List<Option> payload, CancellationToken cancellationToken = default)
+    public async Task<ActionResult<List<Option>>> CreateOrOverwriteOptionsList(string org, string repo, [FromRoute] string optionsListId, [FromBody] List<Option> payload, CancellationToken cancellationToken = default)
     {
         cancellationToken.ThrowIfCancellationRequested();
         string developer = AuthenticationHelper.GetDeveloperUserName(HttpContext);
diff --git a/backend/src/Designer/Controllers/OrganizationController.cs b/backend/src/Designer/Controllers/OrganizationController.cs
index 2005e4d693e..58d2f3da182 100644
--- a/backend/src/Designer/Controllers/OrganizationController.cs
+++ b/backend/src/Designer/Controllers/OrganizationController.cs
@@ -10,6 +10,7 @@ namespace Altinn.Studio.Designer.Controllers
     /// <summary>
     /// This is the API controller for functionality related to repositories.
     /// </summary>
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
     [Route("designer/api/orgs")]
diff --git a/backend/src/Designer/Controllers/PolicyController.cs b/backend/src/Designer/Controllers/PolicyController.cs
index ece9dad0956..75f057ae1c2 100644
--- a/backend/src/Designer/Controllers/PolicyController.cs
+++ b/backend/src/Designer/Controllers/PolicyController.cs
@@ -11,6 +11,7 @@
 
 namespace Altinn.Studio.Designer.Controllers
 {
+    [ApiController]
     [Route("/designer/api/{org}/{app:regex(^(?!datamodels$)[[a-z]][[a-z0-9-]]{{1,28}}[[a-z0-9]]$)}/policy")]
     public class PolicyController : ControllerBase
     {
diff --git a/backend/src/Designer/Controllers/Preview/DataController.cs b/backend/src/Designer/Controllers/Preview/DataController.cs
index dc3e03def6a..ed0b1ad2e61 100644
--- a/backend/src/Designer/Controllers/Preview/DataController.cs
+++ b/backend/src/Designer/Controllers/Preview/DataController.cs
@@ -15,6 +15,7 @@
 
 namespace Altinn.Studio.Designer.Controllers.Preview
 {
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
     [Route("{org:regex(^(?!designer))}/{app:regex(^(?!datamodels$)[[a-z]][[a-z0-9-]]{{1,28}}[[a-z0-9]]$)}/instances/{partyId}/{instanceGuid}/data")]
diff --git a/backend/src/Designer/Controllers/Preview/InstancesController.cs b/backend/src/Designer/Controllers/Preview/InstancesController.cs
index ba947d1bea7..5b4a1b98382 100644
--- a/backend/src/Designer/Controllers/Preview/InstancesController.cs
+++ b/backend/src/Designer/Controllers/Preview/InstancesController.cs
@@ -19,6 +19,7 @@
 
 namespace Altinn.Studio.Designer.Controllers.Preview;
 
+[ApiController]
 [Authorize]
 [AutoValidateAntiforgeryToken]
 [Route("{org:regex(^(?!designer))}/{app:regex(^(?!datamodels$)[[a-z]][[a-z0-9-]]{{1,28}}[[a-z0-9]]$)}/instances")]
diff --git a/backend/src/Designer/Controllers/PreviewController.cs b/backend/src/Designer/Controllers/PreviewController.cs
index 8baf107aae1..9f071258e2f 100644
--- a/backend/src/Designer/Controllers/PreviewController.cs
+++ b/backend/src/Designer/Controllers/PreviewController.cs
@@ -39,6 +39,7 @@ namespace Altinn.Studio.Designer.Controllers
     /// <param name="textsService">Texts Service</param>
     /// <param name="appDevelopmentService">App Development Service</param>
     /// Factory class that knows how to create types of <see cref="AltinnGitRepository"/>
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
     // Uses regex to not match on designer since the call from frontend to get the iframe for app-frontend,
diff --git a/backend/src/Designer/Controllers/ProcessModelingController.cs b/backend/src/Designer/Controllers/ProcessModelingController.cs
index df5e88e4e8f..51afd8390e9 100644
--- a/backend/src/Designer/Controllers/ProcessModelingController.cs
+++ b/backend/src/Designer/Controllers/ProcessModelingController.cs
@@ -21,6 +21,7 @@ namespace Altinn.Studio.Designer.Controllers
     /// <summary>
     /// Controller containing actions that concerns app-development
     /// </summary>
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
     [Route("designer/api/{org}/{repo:regex(^(?!datamodels$)[[a-z]][[a-z0-9-]]{{1,28}}[[a-z0-9]]$)}/process-modelling")]
diff --git a/backend/src/Designer/Controllers/RepositoryController.cs b/backend/src/Designer/Controllers/RepositoryController.cs
index 6a6bdbefbc7..2d36d583abf 100644
--- a/backend/src/Designer/Controllers/RepositoryController.cs
+++ b/backend/src/Designer/Controllers/RepositoryController.cs
@@ -26,6 +26,7 @@ namespace Altinn.Studio.Designer.Controllers
     /// <remarks>
     /// Initializes a new instance of the <see cref="RepositoryController"/> class.
     /// </remarks>
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
     [Route("designer/api/repos")]
@@ -55,14 +56,17 @@ public RepositoryController(IGitea giteaWrapper, ISourceControl sourceControl, I
         }
 
         /// <summary>
-        /// Returns a list over repositories
+        /// Returns a list over repositories specified by search parameters
         /// </summary>
-        /// <param name="searchOptions">The search params</param>
-        /// <returns>List of repositories that user has access to.</returns>
+        /// <remarks>
+        /// All parameters create the search parameters
+        /// </remarks>
+        /// <returns>List of filtered repositories that user has access to.</returns>
         [HttpGet]
         [Route("search")]
-        public async Task<SearchResults> Search(SearchOptions searchOptions)
+        public async Task<SearchResults> Search([FromQuery] string keyword, [FromQuery] int uId, [FromQuery] string sortBy, [FromQuery] string order, [FromQuery] int page, [FromQuery] int limit)
         {
+            SearchOptions searchOptions = new SearchOptions { Keyword = keyword, UId = uId, SortBy = sortBy, Order = order, Page = page, Limit = limit };
             SearchResults repositories = await _giteaApi.SearchRepo(searchOptions);
             return repositories;
         }
diff --git a/backend/src/Designer/Controllers/TextController.cs b/backend/src/Designer/Controllers/TextController.cs
index fbb4c38241c..a7b58caf51a 100644
--- a/backend/src/Designer/Controllers/TextController.cs
+++ b/backend/src/Designer/Controllers/TextController.cs
@@ -20,6 +20,7 @@ namespace Altinn.Studio.Designer.Controllers
     /// <summary>
     /// Controller for resources
     /// </summary>
+    [ApiController]
     [Authorize]
     [AutoValidateAntiforgeryToken]
     [Route("designer/api/{org}/{app:regex(^(?!datamodels$)[[a-z]][[a-z0-9-]]{{1,28}}[[a-z0-9]]$)}/text")]
diff --git a/backend/src/Designer/Controllers/UserController.cs b/backend/src/Designer/Controllers/UserController.cs
index a5870705491..cf4ca69ca1a 100644
--- a/backend/src/Designer/Controllers/UserController.cs
+++ b/backend/src/Designer/Controllers/UserController.cs
@@ -14,6 +14,7 @@ namespace Altinn.Studio.Designer.Controllers
     /// <summary>
     /// API controller for User functionality
     /// </summary>
+    [ApiController]
     [Authorize]
     [Route("designer/api/user")]
     public class UserController : ControllerBase
diff --git a/backend/tests/Designer.Tests/Controllers/Preview/DataControllerTests.cs b/backend/tests/Designer.Tests/Controllers/Preview/DataControllerTests.cs
index 468c73aa4d3..d08ee3edfc1 100644
--- a/backend/tests/Designer.Tests/Controllers/Preview/DataControllerTests.cs
+++ b/backend/tests/Designer.Tests/Controllers/Preview/DataControllerTests.cs
@@ -116,7 +116,7 @@ public async Task Tag_ReturnsCreateOkd()
         DataElement dataElement = await createDataElement(instance, "datamodel");
         string dataPath = $"{Org}/{AppV4}/instances/{PartyId}/{instance.Id}/data/{dataElement.Id}/tags";
         using HttpRequestMessage httpRequestMessageTag = new(HttpMethod.Post, dataPath);
-        httpRequestMessageTag.Content = new StringContent("{\"tag\":\"test\"}", System.Text.Encoding.UTF8, "application/json");
+        httpRequestMessageTag.Content = new StringContent("\"test\"", System.Text.Encoding.UTF8, "application/json");
         using HttpResponseMessage responseTag = await HttpClient.SendAsync(httpRequestMessageTag);
         Assert.Equal(HttpStatusCode.Created, responseTag.StatusCode);
     }