Serializing and Deserializing with JsonDocument

JsonDocument doc = JsonDocument.Parse(json); // MUST dispose.

JsonElement root = doc.RootElement;

JsonElement propertyElement = root.GetProperty("property"); // Get a JsonElement of property.

// Assuming prop is a JSON Array:
foreach (JsonElement prop in propertyElement.EnumerateArray()) 
{
    // Try to get Property from prop and store it in output if successful:
    if (prop.TryGetProperty("Property", out JsonElement output) 
    {
        value = output;
    }
}

using FileStream fs = File.Create(outputFile);
using var writer = new Utf8JsonWriter(fs);
using JsonDocument doc = JsonDocument.Parse(json);

JsonElement root = doc.RootElement;

if (root.ValueKind == JsonValueKind.Object) 
{
    writer.WriteStartObject();
}

else { 
    return; 
}

foreach (JsonProperty prop in root.EnumerateObject()) 
{
    prop.WriteTo(writer);
}

writer.WriteEndObject();
writer.Flush(); // Not necessary; writer will auto-flush when disposed.