diff --git a/Config.txt b/Config.txt
index 6569ad9..a1d8fb8 100644
--- a/Config.txt
+++ b/Config.txt
@@ -4,3 +4,7 @@
 
 = Database.php =
 10101 - SQL request did not give a result
+
+= register.php =
+11101 - User name doesn't match rules
+11102 - User name already exists //TODO
\ No newline at end of file
diff --git a/Database.php b/Database.php
index 5219a8e..1903295 100644
--- a/Database.php
+++ b/Database.php
@@ -32,8 +32,31 @@ class Database
         $this->create_response($data, $error);
     }
 
-    function create_response($data, $error = null){
-        //TODO
+    function create_response($data, $error) {
+        $status_message = create_status_code($error);
+        $meta = jscon_encode(array('status'=>$error, 'message'=>$status_message));
+        $response_element_json = json_encode(array('meta'=>$meta, 'data'=>$data));
+        echo $response_element_json;
+    }
+
+    function create_status_code($error) {
+        switch ($error) {
+            case 0:
+                return 'Success';
+                break;
+            case 10101:
+                return 'SQL statement did not give a result.';
+                break;
+            case 11101:
+                return 'User name does not match rules. User name must be 6 to 20 characters and consist of English
+                letters and numbers only.';
+                break;
+            case 11102:
+                return 'User name already exists. Please pick a different name.';
+                break;
+            default:
+                return 'An unknown error occurred.';
+        }
     }
 
 }
diff --git a/config.inc.php b/config.inc.php
index 4b6f812..455211a 100644
--- a/config.inc.php
+++ b/config.inc.php
@@ -6,10 +6,10 @@
  * Time: 09:45
  */
 
-define("DATABASE_URL", 'lamp.wlan.hwr-berlin.de');
-define("DATABASE_USER", 'gr2');
-define("DATABASE_PASSWORD", '2Au-R2n-cQN-uuG');
-define("DATABASE_NAME", 'CSDB');
+define('DATABASE_URL', 'lamp.wlan.hwr-berlin.de');
+define('DATABASE_USER', 'gr2');
+define('DATABASE_PASSWORD', '2Au-R2n-cQN-uuG');
+define('DATABASE_NAME', 'CSDB');
 
 // TODO
 ?>
\ No newline at end of file
diff --git a/register.php b/register.php
index 8b9eeda..a9d5ec3 100644
--- a/register.php
+++ b/register.php
@@ -7,13 +7,19 @@
  */
 
     require_once('includes.inc.php');
+    define('PATTERN', '^[a-zA-Z0-9 ]{6,20}$');
 
+    $data = null;
+    $error = 0;
     $name = $_GET['name'];
-    $id = md5(uniqid(rand(), true));
+    $uid = md5(uniqid(rand(), true));
     $database = new Database();
-    $database->query('INSERT INTO "Users" ("name", "ID") VALUES  ($1, $2);', array($name, $id)); //TODO unique string
-
-    //echo json_encode(array('id'=>$id, 'name'=>$name));
-    echo "Hello World";
+    $database->query('INSERT INTO "Users" ("name", "ID") VALUES  ($1, $2);', array($name, $uid)); //TODO unique string
+    if(preg_match(PATTERN, $name) != 1) {
+        $error = 11101;
+    } else {
+        $data = json_encode(array('uid'=>$id, 'name'=>$name));
+    }
+    $database->create_response($data, $error);
 
 ?>
\ No newline at end of file