c#格式化json string

public static string JsonStringFormat(string str)
        {
            if (str.IsNullOrEmpty())
            {
                return str;
            }
            try
            {
                var obj = System.Text.Json.JsonSerializer.Deserialize<object>(str);
                return System.Text.Json.JsonSerializer.Serialize(obj, typeof(object), new System.Text.Json.JsonSerializerOptions
                {
                    WriteIndented = true,
                });
            }
            catch (Exception ex)
            {
               Console.WriteLine(ex.ToString()); 
            }
            return str;
        }