How to Deserialize Nested JSON to a Nested Dictionary in C#?

Deserializing Nested JSON to Nested Dictionary in C

When working with nested JSON objects, you may want to deserialize them into a Dictionary where each key-value pair corresponds to a property-value pair in the JSON object. However, by default, System.Text.Json deserializes all objects into JsonElement objects, which may not provide the desired C# types.

Custom JsonConverter

To achieve proper C# types, you need to create a custom JsonConverter. The following converter will handle all JSON value types and convert them to their corresponding C# types:

public class ObjectAsPrimitiveConverter : JsonConverter<object>
{
    ...

    public override object Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        switch (reader.TokenType)
        {
            // Handle null, boolean, string, and number types.

            case JsonTokenType.StartArray:
                // Handle arrays.

            case JsonTokenType.StartObject:
                // Handle objects.

            default:
                throw new JsonException("Unknown token");
        }
    }
}

Using the Converter

To use the custom converter, specify it in your deserialization options:

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

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

Notes

• JSON can represent numbers with arbitrary precision and magnitude, while .Net primitive numeric types have limitations. You can configure whether unsupported numbers are returned as JsonElements or exceptions are thrown.
• You can customize the converter to return double or decimal for floating point numbers and Dictionary or ExpandoObject for JSON objects based on your preference.

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