diff --git a/Client/Client.cs b/Client/Client.cs
index 12acd78..023b806 100644
--- a/Client/Client.cs
+++ b/Client/Client.cs
@@ -75,7 +75,15 @@ namespace Client
                 bool isJson = DataParser.getJsonIdentifier(messageBytes, out identifier);
                 if (isJson)
                 {
-                    Console.WriteLine($"Received json with identifier {identifier}:\n{Encoding.ASCII.GetString(messageBytes.Skip(5).ToArray())}");
+                    switch (identifier)
+                    {
+                        case DataParser.LOGIN:
+                            Console.WriteLine($"Received json with identifier {identifier}:\n{Encoding.ASCII.GetString(messageBytes.Skip(5).ToArray())}");
+                            break;
+                        default:
+                            Console.WriteLine($"Received json with identifier {identifier}:\n{Encoding.ASCII.GetString(messageBytes.Skip(5).ToArray())}");
+                            break;
+                    }
                 }
                 else if (DataParser.isRawData(messageBytes))
                 {
diff --git a/Client/DataParser.cs b/Client/DataParser.cs
index 57a9b1c..2bc16e5 100644
--- a/Client/DataParser.cs
+++ b/Client/DataParser.cs
@@ -1,12 +1,16 @@
 using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
 using System;
+using System.Globalization;
 using System.Linq;
 using System.Text;
 
 namespace Client
 {
-    class DataParser
+    public class DataParser
     {
+        public const string LOGIN = "LOGIN";
+        public const string LOGIN_RESPONSE = "LOGIN_RESPONSE";
         /// <summary>
         /// makes the json object with LOGIN identifier and username and password
         /// </summary>
@@ -17,7 +21,7 @@ namespace Client
         {
             dynamic json = new
             {
-                identifier = "LOGIN",
+                identifier = LOGIN,
                 data = new
                 {
                     username = mUsername,
@@ -28,6 +32,38 @@ namespace Client
             return Encoding.ASCII.GetBytes(JsonConvert.SerializeObject(json));
         }
 
+        public static bool GetUsernamePassword(byte[] jsonbytes, out string username, out string password)
+        {
+            dynamic json = JsonConvert.DeserializeObject(Encoding.ASCII.GetString(jsonbytes));
+            try
+            {
+                username = json.data.username;
+                password = json.data.password;
+                return true;
+            }
+            catch
+            {
+                username = null;
+                password = null;
+                return false;
+            }
+        }
+
+        private static byte[] getJsonMessage(string mIdentifier, dynamic data)
+        {
+            dynamic json = new
+            {
+                identifier = mIdentifier,
+                data
+            };
+            return getMessage(Encoding.ASCII.GetBytes(JsonConvert.SerializeObject(json)), 0x01);
+        }
+
+        public static byte[] getLoginResponse(string mStatus)
+        {
+            return getJsonMessage(LOGIN_RESPONSE, new { status = mStatus });
+        }
+
         /// <summary>
         /// get the identifier from json
         /// </summary>
diff --git a/Server/Client.cs b/Server/Client.cs
index 9ff610e..df16fa2 100644
--- a/Server/Client.cs
+++ b/Server/Client.cs
@@ -3,6 +3,7 @@ using System.IO;
 using System.Linq;
 using System.Net.Sockets;
 using System.Text;
+using Client;
 using Newtonsoft.Json;
 
 namespace Server
@@ -16,6 +17,8 @@ namespace Server
         private byte[] totalBuffer = new byte[1024];
         private int totalBufferReceived = 0;
         private SaveData saveData;
+        private string username = null;
+
 
 
         public string Username { get; set; }
@@ -61,6 +64,13 @@ namespace Server
             this.stream.BeginRead(this.buffer, 0, this.buffer.Length, new AsyncCallback(OnRead), null);
 
         }
+
+        private void OnWrite(IAsyncResult ar)
+        {
+            this.stream.EndWrite(ar);
+        }
+
+
         /// <summary>
         /// TODO
         /// </summary>
@@ -72,8 +82,44 @@ namespace Server
             //0x01 Json
             //0x01 Raw data
 
-            if (message[4] == 0x01)
+            byte[] payloadbytes = new byte[BitConverter.ToInt32(message, 0) - 5];
+
+            Array.Copy(message, 5, payloadbytes, 0, payloadbytes.Length);
+
+            string identifier;
+            bool isJson = DataParser.getJsonIdentifier(message, out identifier);
+            if (isJson)
             {
+                Console.WriteLine($"received json with identifier {identifier} and expecting {DataParser.LOGIN}");
+                switch (identifier)
+                {
+                    case DataParser.LOGIN:
+                        Console.WriteLine("LOGIN");
+                        string username;
+                        string password;
+                        bool worked = DataParser.GetUsernamePassword(payloadbytes, out username, out password);
+                        if (worked)
+                        {
+                            if (verifyLogin(username, password))
+                            {
+                                this.username = username;
+                                stream.BeginWrite(DataParser.getLoginResponse("OK"), 0, 0, new AsyncCallback(OnWrite), null);
+                            }
+                            else
+                            {
+                                stream.BeginWrite(DataParser.getLoginResponse("wrong username or password"), 0, 0, new AsyncCallback(OnWrite), null);
+                            }
+                        }
+                        else
+                        {
+                            stream.BeginWrite(DataParser.getLoginResponse("invalid json"), 0, 0, new AsyncCallback(OnWrite), null);
+                        }
+                        break;
+                    default:
+                        Console.WriteLine("default");
+                        Console.WriteLine($"Received json with identifier {identifier}:\n{Encoding.ASCII.GetString(payloadbytes)}");
+                        break;
+                }
                 byte[] jsonArray = new byte[message.Length - 5];
                 Array.Copy(message, 5, jsonArray, 0, message.Length - 5);
                 dynamic json = JsonConvert.DeserializeObject(Encoding.ASCII.GetString(jsonArray));
@@ -81,7 +127,7 @@ namespace Server
                 saveData.WriteDataJSON(Encoding.ASCII.GetString(jsonArray));
 
             }
-            else if (message[4] == 0x02)
+            else if (DataParser.isRawData(message))
             {
                 Console.WriteLine(message);
                 saveData.WriteDataRAW(Encoding.ASCII.GetString(message));
@@ -89,5 +135,10 @@ namespace Server
 
 
         }
+
+        private bool verifyLogin(string username, string password)
+        {
+            return username == password;
+        }
     }
 }
diff --git a/Server/Server.csproj b/Server/Server.csproj
index 0eaee1b..a91c176 100644
--- a/Server/Server.csproj
+++ b/Server/Server.csproj
@@ -1,12 +1,16 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
-  </PropertyGroup>
+	<PropertyGroup>
+		<OutputType>Exe</OutputType>
+		<TargetFramework>netcoreapp3.1</TargetFramework>
+	</PropertyGroup>
 
-  <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
-  </ItemGroup>
+	<ItemGroup>
+		<PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<ProjectReference Include="..\Client\Client.csproj" />
+	</ItemGroup>
 
 </Project>