HSUI/Config/Profiles/ImportExportHelper.cs

using Newtonsoft.Json;
using System;
using System.IO;
using System.IO.Compression;
using System.Text;

namespace HSUI.Config.Profiles
{
    public static class ImportExportHelper
    {
        public static string CompressAndBase64Encode(string jsonString)
        {
            using MemoryStream output = new();

            using (DeflateStream gzip = new(output, CompressionLevel.Optimal))
            {
                using StreamWriter writer = new(gzip, Encoding.UTF8);
                writer.Write(jsonString);
            }

            return Convert.ToBase64String(output.ToArray());
        }

        public static string Base64DecodeAndDecompress(string base64String)
        {
            var base64EncodedBytes = Convert.FromBase64String(base64String);

            using MemoryStream inputStream = new(base64EncodedBytes);
            using DeflateStream gzip = new(inputStream, CompressionMode.Decompress);
            using StreamReader reader = new(gzip, Encoding.UTF8);
            var decodedString = reader.ReadToEnd();

            return decodedString;
        }

        public static string GenerateExportString(object obj)
        {
            JsonSerializerSettings settings = new JsonSerializerSettings
            {
                TypeNameAssemblyFormatHandling = TypeNameAssemblyFormatHandling.Simple,
                TypeNameHandling = TypeNameHandling.Objects
            };

            var jsonString = JsonConvert.SerializeObject(obj, Formatting.Indented, settings);
            return CompressAndBase64Encode(jsonString);
        }
    }
}