C# set of classes for parsing DSF files

DAZ.cs

using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using Newtonsoft.Json;

namespace DAZ
{
    public class DataCollection<T>
    {
        public int count { get; set; }
        public List<List<T>> values { get; set; }
    }

    public class SimpleCollection<T>
    {
        public int count { get; set; }
        public List<T> values { get; set; }
    }

    public class Vertices : DataCollection<float> { }

    public class PolygonGroups : SimpleCollection<string> { }

    public class PolyList : DataCollection<int> { }

    public class Region
    {
        public string id  { get; set; }
        public string label { get; set; }
        public string display_hint { get; set; }
        public List<Region> children { get; set; }
        public SimpleCollection<int> map { get; set; }
    }

    public class Geometry
    {
        public string id  { get; set; }
        public string name { get; set; }
        public string type { get; set; }
        public string edge_interpolation_mode { get; set; }
        public string subd_mormal_smoothing_mode { get; set; }

        public Vertices vertices { get; set; }
        public PolygonGroups polygon_groups { get; set; }
        public PolygonGroups polygon_material_groups { get; set; }
        public PolyList polylist { get; set; }
        public string default_uv_set;
        public Region root_region { get; set; }
        // public {something} graft { get; set; }
        // public {something} extra { get; set; }
    }

    public class Point
    {
        public string id  { get; set; }
        public string name { get; set; }
        public string type { get; set; }
        public string label { get; set; }
        public bool visible  { get; set; }
        public bool auto_follow  { get; set; }
        public float value { get; set; }
        public long min { get; set; }
        public long max { get; set; }
        public bool display_as_percent { get; set; }
        public float step_size { get; set; }
    }

    public class Node
    {
        public string id  { get; set; }
        public string name { get; set; }
        public string type { get; set; }
        public string label { get; set; }
        public string rotation_order { get; set; }
        public bool inherits_scale { get; set; }
        public List<Point> center_point { get; set; }
        public List<Point> end_point { get; set; }
        public List<Point> orientation { get; set; }
        public List<Point> rotation { get; set; }
        public List<Point> translation { get; set; }
        public List<Point> scale { get; set; }
        public Point general_scale { get; set; }
        public Presentation presentation { get; set; }
        // public {something} extra { get; set; }
    }

    public class Presentation
    {
        public string type { get; set; }
        public string label { get; set; }
        public string description { get; set; }
        public string icon_large { get; set; }
        public List<List<float>> colors { get; set; }
        public string preferred_base { get; set; }
    }

    public class Contributor
    {
        public string author { get; set; }
        public string email { get; set; }
        public string website { get; set; }
    }

    public class AssetInfo
    {
       public string id { get; set; }
       public string type { get; set; }
       public string revision { get; set; }
       public string modified { get; set; }
       public Contributor contributor { get; set; }
    }

    public class DSF
    {
        public string file_version { get; set; }
        public AssetInfo asset_info { get; set; }
        public List<Geometry> geometry_library { get; set; }
        public List<Node> node_library { get; set; }
        // public List<JObject> modifier_library { get; set; }
    }

    public class Utility
    {
        public static DSF Load(string filename)
        {
            FileStream inputStream = new FileStream(filename, FileMode.Open);
            GZipStream inStream = new GZipStream(inputStream, CompressionMode.Decompress);
            StreamReader sr = new StreamReader(inStream);
            var js = JsonSerializer.CreateDefault();
            DSF dsf = (DSF)js.Deserialize(sr, typeof(DSF));

            return dsf;
        }
    }
}

Usage is like this:

        DSF dsf = Utility.Load(filepath);

        Debug.Log(dsf.asset_info.contributor.author);
        Debug.Log(dsf.file_version);
        Geometry g = dsf.geometry_library.First();
        Debug.Log(g.vertices.count);
        Debug.Log(g.polylist.count);