jsontocsv.cs

using System.IO;
using System.Collections.Generic;
using System.Globalization;
using CsvHelper;
using Newtonsoft.Json;

namespace JsonToCsv
{
	public class Program
	{
		private static void Main()
		{
			var leads = JsonConvert.DeserializeObject<IEnumerable<Lead>>(File.ReadAllText("INPUT.txt"));
			using var writer = new StreamWriter("OUTPUT.csv");
			using var csv = new CsvWriter(writer, CultureInfo.InvariantCulture);
			csv.WriteRecords(leads);
		}
	}

	
	public class Lead
	{
		public string ProfilePicture { get; set; }
		public string Username { get; set; }
		public string Fullname { get; set; }
		public string Biography { get; set; }
		public string PhoneNumber { get; set; }
		public string Email { get; set; }
		public long MediaCount { get; set; }
		public long Followers { get; set; }
		public long Followings { get; set; }
		public string ExternalUrl { get; set; }
	}
}