How to Deserialize JSON Elements to Objects in System.Text.Json?

Deserialization of System.Text.Json elements

In Newtonsoft.Json, the ToObject() method is typically used to convert JSON tokens into strongly typed objects. However, there is no equivalent method readily available in System.Text.Json.

Solution for .NET 6

In .NET 6 and later, extension methods have been added to JsonSerializer to deserialize objects directly from JsonElement or JsonDocument. This allows the following syntax:

<code class="language-csharp">using var jDoc = JsonDocument.Parse(str);
var myClass = jDoc.RootElement.GetProperty("SomeProperty").Deserialize<SomeClass>();</code>

Workaround for .NET 5 and earlier versions

For .NET 5 and earlier, a workaround involving writing to an intermediate byte buffer can be used to improve performance:

<code class="language-csharp">public static T ToObject<T>(this JsonElement element, JsonSerializerOptions options = null)
{
    var bufferWriter = new ArrayBufferWriter<byte>();
    using (var writer = new Utf8JsonWriter(bufferWriter))
        element.WriteTo(writer);
    return JsonSerializer.Deserialize<T>(bufferWriter.WrittenSpan, options);
}

public static T ToObject<T>(this JsonDocument document, JsonSerializerOptions options = null)
{
    if (document == null)
        throw new ArgumentNullException(nameof(document));
    return document.RootElement.ToObject<T>(options);
}</code>

Instructions:

• Remember to use the JsonDocument statement for using as it is freeable.
• This workaround is available in .NET Core 3.1 and higher.

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