diff --git a/products/ASC.Files/Server/Startup.cs b/products/ASC.Files/Server/Startup.cs
index 360363b076..4bb3a6cbeb 100644
--- a/products/ASC.Files/Server/Startup.cs
+++ b/products/ASC.Files/Server/Startup.cs
@@ -1,5 +1,6 @@
 
 using System.Text;
+using System.Text.Json.Serialization;
 
 using ASC.Api.Core;
 using ASC.Api.Core.Auth;
@@ -51,6 +52,7 @@ namespace ASC.Files
                     options.JsonSerializerOptions.IgnoreNullValues = true;
                     options.JsonSerializerOptions.Converters.Add(new ApiDateTimeConverter());
                     options.JsonSerializerOptions.Converters.Add(new FileEntryWrapperConverter());
+                    options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
                 });
 
             services.AddMemoryCache();
diff --git a/products/ASC.People/Server/Startup.cs b/products/ASC.People/Server/Startup.cs
index 6dc693a78b..2606c9e65f 100644
--- a/products/ASC.People/Server/Startup.cs
+++ b/products/ASC.People/Server/Startup.cs
@@ -1,5 +1,6 @@
 
 using System;
+using System.Text.Json.Serialization;
 
 using ASC.Api.Core;
 using ASC.Api.Core.Auth;
@@ -50,6 +51,7 @@ namespace ASC.People
                         options.JsonSerializerOptions.WriteIndented = false;
                         options.JsonSerializerOptions.IgnoreNullValues = true;
                         options.JsonSerializerOptions.Converters.Add(new ApiDateTimeConverter());
+                        options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
                     });
 
             services.AddAuthentication("cookie")
diff --git a/web/ASC.Web.Api/Startup.cs b/web/ASC.Web.Api/Startup.cs
index 7decc68e90..856c4c71e4 100644
--- a/web/ASC.Web.Api/Startup.cs
+++ b/web/ASC.Web.Api/Startup.cs
@@ -1,3 +1,5 @@
+using System.Text.Json.Serialization;
+
 using ASC.Api.Core;
 using ASC.Api.Core.Auth;
 using ASC.Api.Core.Core;
@@ -44,6 +46,7 @@ namespace ASC.Web.Api
                         options.JsonSerializerOptions.WriteIndented = false;
                         options.JsonSerializerOptions.IgnoreNullValues = true;
                         options.JsonSerializerOptions.Converters.Add(new ApiDateTimeConverter());
+                        options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
                     });
 
             services.AddAuthentication("cookie")