👀 Views: 3 💬 Answers: 1 📅 Created: 2025-06-06

c# .net json serialization C#

I've searched everywhere and can't find a clear answer... I'm working on a personal project and I'm having issues with a custom `JsonConverter` I implemented for deserializing nested objects in a .NET 6 Web API. Although the converter works as expected for simple objects, it seems to unexpected result when dealing with a nested structure. I receive the behavior message `"want to deserialize the current JSON object (e.g. {\"name\":\"value\"}) into type 'System.String' because the type requires a JSON primitive value."` when attempting to deserialize JSON that has nested properties. Here's the relevant code for my custom converter: ```csharp public class NestedObjectConverter : JsonConverter<NestedObject> { public override NestedObject Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) { var nestedObject = new NestedObject(); while (reader.Read()) { if (reader.TokenType == JsonTokenType.EndObject) return nestedObject; var propertyName = reader.GetString(); reader.Read(); // Move to value if (propertyName == "Name") { nestedObject.Name = reader.GetString(); } else if (propertyName == "Details") { nestedObject.Details = JsonSerializer.Deserialize<Details>(ref reader, options); } } return nestedObject; } public override void Write(Utf8JsonWriter writer, NestedObject value, JsonSerializerOptions options) { writer.WriteStartObject(); writer.WriteString("Name", value.Name); writer.WritePropertyName("Details"); JsonSerializer.Serialize(writer, value.Details, options); writer.WriteEndObject(); } } ``` And here is how I am trying to use it during deserialization: ```csharp var options = new JsonSerializerOptions { Converters = { new NestedObjectConverter() } }; var nestedObject = JsonSerializer.Deserialize<NestedObject>(jsonString, options); ``` The JSON string I'm trying to deserialize looks like this: ```json { "Name": "Test Object", "Details": { "Info": "Sample Info", "Value": 123 } } ``` I've confirmed that the structure of the JSON matches my `NestedObject` and `Details` classes. I suspect that the way I'm reading the nested properties in my converter might not be aligned correctly. Could someone provide insights into what might be going wrong or suggest improvements to my `JsonConverter` implementation? Any help would be appreciated! My development environment is macOS. I'd really appreciate any guidance on this. For context: I'm using C# on Windows. Is there a better approach?