Allow JsonConverterAttribute to be applied to an Enum

src/System.Text.Json/ref/System.Text.Json.cs

@@ -459,7 +459,7 @@ public abstract partial class JsonConverter
         internal JsonConverter() { }
         public abstract bool CanConvert(System.Type typeToConvert);
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Class | System.AttributeTargets.Property | System.AttributeTargets.Struct, AllowMultiple=false)]
+    [System.AttributeUsageAttribute(System.AttributeTargets.Class | System.AttributeTargets.Enum | System.AttributeTargets.Property | System.AttributeTargets.Struct, AllowMultiple=false)]
     public partial class JsonConverterAttribute : System.Text.Json.Serialization.JsonAttribute
     {
         protected JsonConverterAttribute() { }

src/System.Text.Json/src/System/Text/Json/Serialization/JsonConverterAttribute.cs

@@ -14,7 +14,7 @@ namespace System.Text.Json.Serialization
     /// <see cref="JsonSerializerOptions.Converters"/> or there is another <see cref="JsonConverterAttribute"/> on a property
     /// of the same type.
     /// </remarks>
-    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Class | AttributeTargets.Struct, AllowMultiple = false)]
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Enum | AttributeTargets.Property | AttributeTargets.Struct, AllowMultiple = false)]
     public class JsonConverterAttribute : JsonAttribute
     {
         /// <summary>

src/System.Text.Json/tests/Serialization/EnumConverterTests.cs

@@ -165,5 +165,25 @@ public override bool CanConvert(Type typeToConvert)
             public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options)
                 => s_stringEnumConverter.CreateConverter(typeToConvert, options);
         }
+
+        [JsonConverter(typeof(JsonStringEnumConverter))]
+        private enum MyCustomEnum
+        {
+            First = 1,
+            Second =2
+        }
+
+        [Fact]
+        public void EnumWithConverterAttribute()
+        {
+            string json = JsonSerializer.Serialize(MyCustomEnum.Second);
+            Assert.Equal(@"""Second""", json);
+
+            MyCustomEnum obj = JsonSerializer.Deserialize<MyCustomEnum>("\"Second\"");
+            Assert.Equal(MyCustomEnum.Second, obj);
+
+            obj = JsonSerializer.Deserialize<MyCustomEnum>("2");
+            Assert.Equal(MyCustomEnum.Second, obj);
+        }
     }
 }