diff --git a/src/Prowlarr.Api.V1/Commands/CommandController.cs b/src/Prowlarr.Api.V1/Commands/CommandController.cs
index a375b7966..eb9ee70cf 100644
--- a/src/Prowlarr.Api.V1/Commands/CommandController.cs
+++ b/src/Prowlarr.Api.V1/Commands/CommandController.cs
@@ -46,6 +46,7 @@ public override CommandResource GetResourceById(int id)
         }
 
         [RestPostById]
+        [Produces("application/json")]
         public ActionResult<CommandResource> StartCommand(CommandResource commandResource)
         {
             var commandType =
@@ -69,6 +70,7 @@ public ActionResult<CommandResource> StartCommand(CommandResource commandResourc
         }
 
         [HttpGet]
+        [Produces("application/json")]
         public List<CommandResource> GetStartedCommands()
         {
             return _commandQueueManager.All().ToResource();
diff --git a/src/Prowlarr.Api.V1/Config/ConfigController.cs b/src/Prowlarr.Api.V1/Config/ConfigController.cs
index e56f5e3e5..f6a001e10 100644
--- a/src/Prowlarr.Api.V1/Config/ConfigController.cs
+++ b/src/Prowlarr.Api.V1/Config/ConfigController.cs
@@ -23,6 +23,7 @@ public override TResource GetResourceById(int id)
         }
 
         [HttpGet]
+        [Produces("application/json")]
         public TResource GetConfig()
         {
             var resource = ToResource(_configService);
@@ -32,6 +33,7 @@ public TResource GetConfig()
         }
 
         [RestPutById]
+        [Produces("application/json")]
         public virtual ActionResult<TResource> SaveConfig(TResource resource)
         {
             var dictionary = resource.GetType()
diff --git a/src/Prowlarr.Api.V1/CustomFilters/CustomFilterController.cs b/src/Prowlarr.Api.V1/CustomFilters/CustomFilterController.cs
index c60318885..018a3cc9f 100644
--- a/src/Prowlarr.Api.V1/CustomFilters/CustomFilterController.cs
+++ b/src/Prowlarr.Api.V1/CustomFilters/CustomFilterController.cs
@@ -23,12 +23,14 @@ public override CustomFilterResource GetResourceById(int id)
         }
 
         [HttpGet]
+        [Produces("application/json")]
         public List<CustomFilterResource> GetCustomFilters()
         {
             return _customFilterService.All().ToResource();
         }
 
         [RestPostById]
+        [Produces("application/json")]
         public ActionResult<CustomFilterResource> AddCustomFilter(CustomFilterResource resource)
         {
             var customFilter = _customFilterService.Add(resource.ToModel());
@@ -37,6 +39,7 @@ public ActionResult<CustomFilterResource> AddCustomFilter(CustomFilterResource r
         }
 
         [RestPutById]
+        [Produces("application/json")]
         public ActionResult<CustomFilterResource> UpdateCustomFilter(CustomFilterResource resource)
         {
             _customFilterService.Update(resource.ToModel());
diff --git a/src/Prowlarr.Api.V1/Health/HealthController.cs b/src/Prowlarr.Api.V1/Health/HealthController.cs
index 8f13ca598..9c562214d 100644
--- a/src/Prowlarr.Api.V1/Health/HealthController.cs
+++ b/src/Prowlarr.Api.V1/Health/HealthController.cs
@@ -28,6 +28,7 @@ public override HealthResource GetResourceById(int id)
         }
 
         [HttpGet]
+        [Produces("application/json")]
         public List<HealthResource> GetHealth()
         {
             return _healthCheckService.Results().ToResource();
diff --git a/src/Prowlarr.Api.V1/History/HistoryController.cs b/src/Prowlarr.Api.V1/History/HistoryController.cs
index 2bf7f9774..aee0eb84d 100644
--- a/src/Prowlarr.Api.V1/History/HistoryController.cs
+++ b/src/Prowlarr.Api.V1/History/HistoryController.cs
@@ -27,6 +27,7 @@ protected HistoryResource MapToResource(NzbDrone.Core.History.History model)
         }
 
         [HttpGet]
+        [Produces("application/json")]
         public PagingResource<HistoryResource> GetHistory()
         {
             var pagingResource = Request.ReadPagingResourceFromRequest<HistoryResource>();
@@ -58,12 +59,14 @@ public PagingResource<HistoryResource> GetHistory()
         }
 
         [HttpGet("since")]
+        [Produces("application/json")]
         public List<HistoryResource> GetHistorySince(DateTime date, HistoryEventType? eventType = null)
         {
             return _historyService.Since(date, eventType).Select(h => MapToResource(h)).ToList();
         }
 
         [HttpGet("indexer")]
+        [Produces("application/json")]
         public List<HistoryResource> GetIndexerHistory(int indexerId, HistoryEventType? eventType = null)
         {
             return _historyService.GetByIndexerId(indexerId, eventType).Select(h => MapToResource(h)).ToList();
diff --git a/src/Prowlarr.Api.V1/Languages/LanguageController.cs b/src/Prowlarr.Api.V1/Languages/LanguageController.cs
index 33622aea9..de7a2c4e7 100644
--- a/src/Prowlarr.Api.V1/Languages/LanguageController.cs
+++ b/src/Prowlarr.Api.V1/Languages/LanguageController.cs
@@ -22,6 +22,7 @@ public override LanguageResource GetResourceById(int id)
         }
 
         [HttpGet]
+        [Produces("application/json")]
         public List<LanguageResource> GetAll()
         {
             return Language.All.Select(l => new LanguageResource
diff --git a/src/Prowlarr.Api.V1/Localization/LocalizationController.cs b/src/Prowlarr.Api.V1/Localization/LocalizationController.cs
index ea1a6b7c5..845b4666b 100644
--- a/src/Prowlarr.Api.V1/Localization/LocalizationController.cs
+++ b/src/Prowlarr.Api.V1/Localization/LocalizationController.cs
@@ -21,6 +21,7 @@ public LocalizationController(ILocalizationService localizationService)
         }
 
         [HttpGet]
+        [Produces("application/json")]
         public string GetLocalizationDictionary()
         {
             return JsonSerializer.Serialize(_localizationService.GetLocalizationDictionary().ToResource(), _serializerSettings);
diff --git a/src/Prowlarr.Api.V1/ProviderControllerBase.cs b/src/Prowlarr.Api.V1/ProviderControllerBase.cs
index 993357745..0be76531b 100644
--- a/src/Prowlarr.Api.V1/ProviderControllerBase.cs
+++ b/src/Prowlarr.Api.V1/ProviderControllerBase.cs
@@ -41,6 +41,7 @@ public override TProviderResource GetResourceById(int id)
         }
 
         [HttpGet]
+        [Produces("application/json")]
         public List<TProviderResource> GetAll()
         {
             var providerDefinitions = _providerFactory.All().OrderBy(p => p.ImplementationName);
@@ -58,6 +59,7 @@ public List<TProviderResource> GetAll()
         }
 
         [RestPostById]
+        [Produces("application/json")]
         public ActionResult<TProviderResource> CreateProvider(TProviderResource providerResource)
         {
             var providerDefinition = GetDefinition(providerResource, false);
@@ -73,6 +75,7 @@ public ActionResult<TProviderResource> CreateProvider(TProviderResource provider
         }
 
         [RestPutById]
+        [Produces("application/json")]
         public ActionResult<TProviderResource> UpdateProvider(TProviderResource providerResource)
         {
             var providerDefinition = GetDefinition(providerResource, false);
@@ -110,6 +113,7 @@ public object DeleteProvider(int id)
         }
 
         [HttpGet("schema")]
+        [Produces("application/json")]
         public virtual List<TProviderResource> GetTemplates()
         {
             var defaultDefinitions = _providerFactory.GetDefaultDefinitions().OrderBy(p => p.ImplementationName).ToList();