using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

​

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("## Test1\n");

        Console.WriteLine(ModifyJSON(googleSearchText, "$..", "url", "~~ url masked ~~", Formatting.Indented));

        // "url": "~~ url masked ~~",

​

        Console.WriteLine("\n\n## Test2\n");

        Console.WriteLine(ModifyJSON(googleSearchText, "$.responseData.cursor.pages[?(@.label>=3)]", "label", "-1", Formatting.Indented));

        // "label": -1

        Console.WriteLine("\n\n## Test3\n");

        Console.WriteLine(ModifyJSON(googleSearchText, "$.responseData.results[1]", "pages", "null", Formatting.Indented));

        // "pages": null,

        Console.WriteLine("\n\n## Test4\n");

        Console.WriteLine(ModifyJSON(googleSearchText, "$.responseData.cursor", "pages", "null", Formatting.Indented));

        // "pages": null,

    }

    public static string ModifyJSON(string jsource, string jpath, string jnode, string jvalue, Formatting jf = Formatting.None)

    {

        JObject jobj = JObject.Parse(jsource);

        if (jpath.EndsWith("..")) jpath = jpath + jnode;

        else jpath = jpath + "." + jnode;

        foreach (var token in jobj.SelectTokens(jpath))

        {

            // Case: JProperty

            var prop = token.Parent as JProperty;

            if (prop != null)

            {

                prop.Value = jvalue;

                int num;

                if (int.TryParse(jvalue, out num)) prop.Value = num;

                if (jvalue.Equals("true", StringComparison.OrdinalIgnoreCase)) prop.Value = true;

                if (jvalue.Equals("false", StringComparison.OrdinalIgnoreCase)) prop.Value = false;

                if (jvalue.Equals("null", StringComparison.OrdinalIgnoreCase)) prop.Value = null;

            }

            // Case: JArray

            var array = token.Parent as JArray;

            if (array != null)

            {

                if (jvalue.Equals("null", StringComparison.OrdinalIgnoreCase))

                    array = null;

            }

            // Case: JObject

            var obj = token.Parent as JObject;

            if (obj != null)

            {

                if (jvalue.Equals("null", StringComparison.OrdinalIgnoreCase))

                    obj = null;

            }

        }

        return JsonConvert.SerializeObject(jobj, jf);

    }

​

​

    static string googleSearchText = @"{

  'responseData': {

    'results': [

      {

        'GsearchResultClass': 'GwebSearch',

        'unescapedUrl': 'http://en.wikipedia.org/wiki/Paris_Hilton',

        'url': 'http://en.wikipedia.org/wiki/Paris_Hilton',

        'visibleUrl': 'en.wikipedia.org',

        'cacheUrl': 'http://www.google.com/search?q=cache:TwrPfhd22hYJ:en.wikipedia.org',

        'title': '<b>Paris Hilton</b> - Wikipedia, the free encyclopedia',

        'titleNoFormatting': 'Paris Hilton - Wikipedia, the free encyclopedia',

        'pages': {

          'start': '0',

          'label': 1

        },

       'content': '[1] In 2006, she released her debut album...'

      },

      {

        'GsearchResultClass': 'GwebSearch',

        'unescapedUrl': 'http://www.imdb.com/name/nm0385296/',

        'url': 'http://www.imdb.com/name/nm0385296/',

        'visibleUrl': 'www.imdb.com',

        'cacheUrl': 'http://www.google.com/search?q=cache:1i34KkqnsooJ:www.imdb.com',

        'title': '<b>Paris Hilton</b>',

        'titleNoFormatting': 'Paris Hilton',

        'pages': {

          'start': '0',

          'label': 1

        },

        'content': 'Self: Zoolander. Socialite <b>Paris Hilton</b>...'

      }

    ],

    'cursor': {

      'pages': [

        {

          'start': '0',

          'label': 1

        },

        {

          'start': '4',

          'label': 2

        },

        {

          'start': '8',

          'label': 3

        },

        {

          'start': '12',

          'label': 4

        }

      ],

      'estimatedResultCount': '59600000',

      'currentPageIndex': 0,

      'moreResultsUrl': 'http://www.google.com/search?oe=utf8&ie=utf8...'

    }

  },

  'responseDetails': null,

  'responseStatus': 200

}

";

}

​