Dump complex object to JSON (quick & dirty approximation of JavaScript's console.log)

JsonDumper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using Newtonsoft.Json;
using System.Text;

public static class JsonDumperSimple
{
    public static string Stringify(object obj)
    {
        return JsonConvert.SerializeObject(obj, Formatting.Indented);
    }
}

public static class JsonDumper
{
    [Flags]
    public enum FormatOptions
    {
        BreakOnNesting = 0,
        BreakOnBranchNode = 1,
        BreakOnLeafNode = 2
    }
    
    public const FormatOptions Flattened = FormatOptions.BreakOnNesting | FormatOptions.BreakOnBranchNode;
    public const FormatOptions KBR = FormatOptions.BreakOnLeafNode;
    public const FormatOptions Expanded = FormatOptions.BreakOnNesting | FormatOptions.BreakOnBranchNode | FormatOptions.BreakOnLeafNode;
    
    public static void Print(object obj, FormatOptions format = Expanded)
    {
        Console.WriteLine(Stringify(obj, format));
    }
    
    public static string Stringify(object obj, FormatOptions format = Expanded)
    {
        var str = JsonConvert.SerializeObject(obj);
        return Format(str, format);
    }
    
    public static string Format(string str, FormatOptions format)
    {
        var indent = 0;
        var quoted = false;
        var sb = new StringBuilder();
        for (var i = 0; i < str.Length; i++)
        {
            var ch = str[i];
            switch (ch)
            {
                case '{':
                case '[':
                    sb.Append(ch);
                    if (!quoted && i + 1 < str.Length)
                    {
                        ++indent;
                        switch (str[i + 1]) 
                        {
                            case '{':
                            case '[':
                                if ((format & FormatOptions.BreakOnNesting) == FormatOptions.BreakOnNesting)
                                {
                                    sb.AppendLine();
                                    sb.Append(GetIndent(indent));
                                }
                                break;
                            default:
                                var _ch = ch == '{' ? '}' : ']';
                                if ((format & FormatOptions.BreakOnLeafNode) == FormatOptions.BreakOnLeafNode || !Regex.IsMatch(str.Substring(i + 1), @"^[^[{:]*\" + _ch))
                                {
                                    sb.AppendLine();
                                    sb.Append(GetIndent(indent));
                                }
                                break;
                        }
                    }
                    break;
                case '}':
                case ']':
                    if (!quoted)
                    {
                        --indent;
                        if (i > 0) 
                        {
                            switch (str[i - 1]) 
                            {
                                case ']':
                                case '}':
                                    if ((format & FormatOptions.BreakOnNesting) == FormatOptions.BreakOnNesting)
                                    {
                                        sb.AppendLine();
                                        sb.Append(GetIndent(indent));
                                    }
                                    break;
                                default:
                                    if ((format & FormatOptions.BreakOnLeafNode) == FormatOptions.BreakOnLeafNode)
                                    {
                                        sb.AppendLine();
                                        sb.Append(GetIndent(indent));
                                    }
                                    break;
                            }
                        }
                    }
                    sb.Append(ch);
                    break;
                case '"':
                    sb.Append(ch);
                    bool escaped = false;
                    var index = i;
                    while (index > 0 && str[--index] == '\\')
                        escaped = !escaped;
                    if (!escaped)
                        quoted = !quoted;
                    break;
                case ',':
                    sb.Append(ch);
                    if (!quoted && i + 1 < str.Length)
                    {
                        switch (str[i + 1])
                        {
                            case '[':
                            case '{':
                                if ((format & FormatOptions.BreakOnBranchNode) == FormatOptions.BreakOnBranchNode)
                                {
                                    sb.AppendLine();
                                    sb.Append(GetIndent(indent));
                                }
                                else 
                                {                                        
                                    sb.Append(" ");
                                }
                                break;
                            default:
                                if ((format & FormatOptions.BreakOnLeafNode) == FormatOptions.BreakOnLeafNode || !Regex.IsMatch(str.Substring(i), @"^[^[{:]*[}\]]"))
                                {
                                    sb.AppendLine();
                                    sb.Append(GetIndent(indent));
                                } 
                                break;
                        }
                    }
                    break;
                case ':':
                    sb.Append(ch);
                    if (!quoted)
                        sb.Append(" ");
                    break;
                default:
                    sb.Append(ch);
                    break;
            }
        }
        return sb.ToString();
    }
        
    private static string GetIndent(int indent, int increment = 2) 
    {
        var totalIndent = indent * increment;
        return totalIndent > 0
            ? string.Join("", Enumerable.Range(0, totalIndent).Select(i => " "))
            : "";
    }
}

TestProgram.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using Newtonsoft.Json;
using System.Text;

public class Program
{
    public static void Main(string[] args)
    {
        var z = new List<List<string>>() 
        {
            new List<string> {"a","b","c"}, 
            new List<string> {"d","e"},
            new List<string> {"g","h","i"},
        };
        
        var t = Test.Create("Property 1", z.GetAllPhrases());
        
        JsonDumper.Print(t, JsonDumper.Flattened);
    }
}
public static class Test
{
    public class _Test<T> 
    {
        public string Prop1 {get;set;} 
        public T Prop2 {get;set;}
    }
    
    public static _Test<T> Create<T>(string prop1, T prop2)
    {
        return new _Test<T>()
        {
            Prop1 = prop1,
            Prop2 = prop2
        };
    }
}
public static class EnumerableExtensions
{
    public static IEnumerable<IEnumerable<T>> CartesianProduct<T>(this IEnumerable<IEnumerable<T>> sequences)
    {
        IEnumerable<IEnumerable<T>> emptyProduct = new[] { Enumerable.Empty<T>() };

        //For each sequence, add each item in that sequence to the product we have so far.
        return sequences.Aggregate(emptyProduct,
                                    (accumulator, sequence) =>
                                       from seq in accumulator
                                       from item in sequence
                                       select seq.Concat(new[] { item }));
    }
    public static IEnumerable<List<string>> GetAllPhrases(this IEnumerable<List<string>> sequences, int minLength = 2, int maxLength = 5)
    {
        var sequenceList = sequences.ToList();

        for (var i = minLength; i <= sequenceList.Count && i <= maxLength; i++)
        {
            var cart = sequenceList.Take(i).CartesianProduct().ToList();

            foreach (var sequence in cart)
            {
                yield return sequence.ToList();
            }
        }
    }
}