using System;

using Newtonsoft.Json;

public class Program

{

    private const string Source = "{\"data\": [{ \"key1\":\"string\", \"key2\":\"string\", \"key3\":\"string\"} ]}";

    public record GetSampleResponse(Response[] Data);

    public record Response(string Key1, string Key2, string Key3, string Key4);

    public static void Main()

    {

        var deserialized = JsonConvert.DeserializeObject<GetSampleResponse>(Source);

        Console.WriteLine($"Length: {deserialized.Data.Length}");

        var reserialized = JsonConvert.SerializeObject(deserialized);

        Console.WriteLine($"Serialized: {reserialized}");

    }

}