How Can I Deserialize Nested JSON into Typed C# Objects?

Nested JSON Deserialization with Typed C# Objects

Deserializing nested JSON into a flat Dictionary in C# using System.Text.Json can result in most properties becoming of type JsonElement. To achieve more specific C# types based on JSON property types, a custom JsonConverter is required.

ObjectAsPrimitiveConverter

The following code provides a custom JsonConverter named ObjectAsPrimitiveConverter:

public class ObjectAsPrimitiveConverter : JsonConverter<object>
{
    // ... (converter implementation)
}

Converter Configuration

To configure the converter, specify the desired FloatFormat (double or decimal), UnknownNumberFormat (error or JsonElement), and ObjectFormat (ExpandoObject or Dictionary):

var options = new JsonSerializerOptions
{
    Converters = { new ObjectAsPrimitiveConverter(...) },
    WriteIndented = true,
};

Deserialization to Object

To deserialize nested JSON to an object (or dynamic if using ExpandoObject), use:

dynamic d = JsonSerializer.Deserialize<dynamic>(json, options);

Customization

The converter can be customized to support different numeric types and object formats. Additionally, it can be extended to handle unsupported JSON numbers more gracefully.

Conclusion

By implementing a custom JsonConverter, you can achieve type-specific deserialization of nested JSON objects into a hierarchical data structure with proper C# types for each property.

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