static string FormatJson(string json)
{
int indentation = 0;
int quoteCount = 0;
var result =
from ch in json
let quotes = ch == '"' ? quoteCount++ : quoteCount
let lineBreak = ch == ',' && quotes % 2 == 0 ? ch + Environment.NewLine + String.Concat(Enumerable.Repeat(INDENT_STRING, indentation)) : null
let openChar = ch == '{' || ch == '[' ? ch + Environment.NewLine + String.Concat(Enumerable.Repeat(INDENT_STRING, ++indentation)) : ch.ToString()
let closeChar = ch == '}' || ch == ']' ? Environment.NewLine + String.Concat(Enumerable.Repeat(INDENT_STRING, --indentation)) + ch : ch.ToString()
select lineBreak == null
? openChar.Length > 1
? openChar
: closeChar
: lineBreak;
return string.Concat(result);
}