diff --git a/Apps/NxDomainApp/App.cs b/Apps/NxDomainApp/App.cs
index 51c52cb7..2b6af49f 100644
--- a/Apps/NxDomainApp/App.cs
+++ b/Apps/NxDomainApp/App.cs
@@ -1,6 +1,6 @@
 /*
 Technitium DNS Server
-Copyright (C) 2021  Shreyas Zare (shreyas@technitium.com)
+Copyright (C) 2022  Shreyas Zare (shreyas@technitium.com)
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -18,10 +18,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 using DnsServerCore.ApplicationCommon;
-using Newtonsoft.Json;
+using System;
 using System.Collections.Generic;
 using System.Net;
+using System.Text.Json;
 using System.Threading.Tasks;
+using TechnitiumLibrary;
 using TechnitiumLibrary.Net.Dns;
 using TechnitiumLibrary.Net.Dns.ResourceRecords;
 
@@ -51,16 +53,6 @@ namespace NxDomain
 
         #region private
 
-        private static IReadOnlyDictionary<string, object> ReadJsonDomainArray(dynamic jsonDomainArray)
-        {
-            Dictionary<string, object> domains = new Dictionary<string, object>(jsonDomainArray.Count);
-
-            foreach (dynamic jsonDomain in jsonDomainArray)
-                domains.TryAdd(jsonDomain.Value, null);
-
-            return domains;
-        }
-
         private static string GetParentZone(string domain)
         {
             int i = domain.IndexOf('.');
@@ -100,18 +92,21 @@ namespace NxDomain
         {
             _soaRecord = new DnsSOARecordData(dnsServer.ServerDomain, "hostadmin@" + dnsServer.ServerDomain, 1, 14400, 3600, 604800, 60);
 
-            dynamic jsonConfig = JsonConvert.DeserializeObject(config);
+            using JsonDocument jsonDocument = JsonDocument.Parse(config);
+            JsonElement jsonConfig = jsonDocument.RootElement;
 
-            _enableBlocking = jsonConfig.enableBlocking.Value;
-            _allowTxtBlockingReport = jsonConfig.allowTxtBlockingReport.Value;
-
-            _blockListZone = ReadJsonDomainArray(jsonConfig.blocked);
+            _enableBlocking = jsonConfig.GetProperty("enableBlocking").GetBoolean();
+            _allowTxtBlockingReport = jsonConfig.GetProperty("allowTxtBlockingReport").GetBoolean();
+            _blockListZone = jsonConfig.ReadArrayAsMap("blocked", delegate (JsonElement jsonDomainName) { return new Tuple<string, object>(jsonDomainName.GetString(), null); });
 
             return Task.CompletedTask;
         }
 
         public Task<DnsDatagram> ProcessRequestAsync(DnsDatagram request, IPEndPoint remoteEP, DnsTransportProtocol protocol, bool isRecursionAllowed)
         {
+            if (!_enableBlocking)
+                return Task.FromResult<DnsDatagram>(null);
+
             DnsQuestionRecord question = request.Question[0];
 
             if (!IsZoneBlocked(question.Name, out string blockedDomain))