Formats a valid JSON string into a pretty output

JsonPretty.cs

/// <summary>
/// Formats a JSON string by walking through it and examining the contents.
/// </summary>
/// <param name="json">Unformatted JSON string, expects valid JSON with quoted keys and no whitespace.</param>
/// <returns>Formatted JSON string</returns>
/// <remarks>
/// [ { should have line breaks and tabs after them
/// ] } should have line breaks and tabs before them
/// : should have a space after it
/// , should have a line break and tab
/// </remarks>
public static string PrettyJson(this string json)
{
	var sbOutput = new StringBuilder();
	bool inQuotes = false;
	int level = 0;

	Action Tabify = () =>
	{
		var chars = new char[level];

		for (var i = 0; i < level; i++)
			chars[i] = '\t';

		sbOutput.Append(chars);
	};

	for (var i = 0; i < json.Length; i++)
	{
		var curChar = json[i];

		// Ignore escaped quotes
		if (curChar == '"' && json[i - 1] != '\\')
		{
			if (!inQuotes)
				inQuotes = true;
			else
				inQuotes = false;
		}

		// Don't format anything within quotes
		if (!inQuotes)
		{
			if (curChar == '{' || curChar == '[' || curChar == ',')
			{
				if (curChar != ',') level++;
				sbOutput.Append(curChar);
				sbOutput.AppendLine();
				Tabify();
			}
			else if (curChar == '}' || curChar == ']')
			{
				level--;
				sbOutput.AppendLine();
				Tabify();
				sbOutput.Append(curChar);
			}
			else if (curChar == ':')
			{
				sbOutput.Append(curChar + " ");
			}
			else
			{
				sbOutput.Append(curChar);
			}
		}
		else
		{
			sbOutput.Append(curChar);
		}
	}

	return sbOutput.ToString();
}