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Kreta.Core/JsonConverter/StringTrimConverter.cs

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+using System;
+using Newtonsoft.Json;
+
+namespace Kreta.Core.JsonConverter
+{
+    public class StringTrimConverter : JsonConverter<string>
+    {
+        public override string ReadJson(JsonReader reader, Type objectType, string existingValue, bool hasExistingValue, JsonSerializer serializer)
+        {
+            if (reader.TokenType == JsonToken.String)
+            {
+                var value = (string)reader.Value;
+
+                if (string.IsNullOrWhiteSpace(value))
+                {
+                    return null;
+                }
+
+                return value.Trim();
+            }
+
+            return null;
+        }
+
+        public override void WriteJson(JsonWriter writer, string value, JsonSerializer serializer)
+        {
+
+            if (value is null)
+            {
+                writer.WriteNull();
+            }
+            else
+            {
+                writer.WriteValue(value);
+            }
+        }
+    }
+}
+