diff --git a/backend/application/__init__.py b/backend/application/__init__.py
index b816c53..379ab42 100644
--- a/backend/application/__init__.py
+++ b/backend/application/__init__.py
@@ -1,11 +1,10 @@
 from flask import Flask
 from flask_sqlalchemy import SQLAlchemy
-from ddtrace import patch_all
 import sys
 import os
 
 db = SQLAlchemy()
-#patch_all()
+
 
 def create_app():
     app = Flask(__name__, instance_relative_config=False)
@@ -29,5 +28,4 @@ def create_app():
     with app.app_context():
         from . import routes
         db.create_all()
-
     return app
diff --git a/backend/application/api_functions.py b/backend/application/api_functions.py
index 742b5b6..5cb4974 100644
--- a/backend/application/api_functions.py
+++ b/backend/application/api_functions.py
@@ -15,7 +15,7 @@ def db_login(ip, email, password):
         Users.email == email
     ).first()
     if not user:
-        message = f'{email} does not exist.'
+        message = f'Email or password invalid'
         log = Logs(
             date=datetime.now().strftime('%Y-%m-%dT%H:%M:%S'),
             id_user=None,
@@ -70,12 +70,12 @@ def db_login(ip, email, password):
         return {'status': 0, 'message': message, 'data': user.json()}
 
 
-def db_register(ip, email, login, password, is_admin):
+def db_register(ip, email, password, is_admin):
     user = Users.query.filter(
         Users.email == email
     ).first()
     if user:
-        message = f'{email} ({login}) already exist.'
+        message = f'{email} already exist.'
         log = Logs(
             date=datetime.now().strftime('%Y-%m-%dT%H:%M:%S'),
             id_user=None,
@@ -97,7 +97,6 @@ def db_register(ip, email, login, password, is_admin):
 
     user = Users(
         email=email,
-        login=login,
         hash_pass=hash_pass,
         salt=salt,
         is_admin=is_admin
diff --git a/backend/application/responses.py b/backend/application/responses.py
index df1c610..39e7fff 100644
--- a/backend/application/responses.py
+++ b/backend/application/responses.py
@@ -8,7 +8,7 @@ def send_error(status_code, message):
         'message': message
     }
     res = app.response_class(
-        response=json.dumps(data_json, sort_keys=True),
+        response=json.dumps(data_json),
         status=status_code,
         mimetype='application/json'
     )
@@ -23,7 +23,7 @@ def send_message(message, data):
         'data': data
     }
     res = app.response_class(
-        response=json.dumps(data_json, sort_keys=True),
+        response=json.dumps(data_json),
         status=200,
         mimetype='application/json'
     )
diff --git a/backend/application/routes.py b/backend/application/routes.py
index 976491c..0241068 100644
--- a/backend/application/routes.py
+++ b/backend/application/routes.py
@@ -29,19 +29,18 @@ def login():
 def register():
     post_json = request.json
     post_email = str(post_json['email'])
-    post_login = str(post_json['login'])
     post_password = str(post_json['password'])
     post_is_admin = bool(post_json['is_admin'])
 
-    if post_email and post_login and post_password and post_is_admin:
+    if post_email and post_password and post_is_admin:
         ip = request.remote_addr
-        res = db_register(ip, post_email, post_login, post_password, post_is_admin)
+        res = db_register(ip, post_email, post_password, post_is_admin)
         if res['status'] == 1:
             return send_error(500, res['message'])
         elif res['status'] == 0:
             return send_message(res['message'], res['data'])
     else:
-        return send_error(400, 'POST Request Error : Need email, login, password and is_admin fields.')
+        return send_error(400, 'POST Request Error : Need email, password and is_admin fields.')
 
 
 # Logout
diff --git a/backend/application/users_model.py b/backend/application/users_model.py
index 15bac2a..bdf19d5 100644
--- a/backend/application/users_model.py
+++ b/backend/application/users_model.py
@@ -1,3 +1,7 @@
+from datetime import datetime, timedelta
+from flask import current_app as app
+import jwt
+
 from . import db
 
 
@@ -37,3 +41,32 @@ class Users(db.Model):
 
     def get_salt(self):
         return self.salt
+
+    def auth_token(self):
+        try:
+            time = datetime.now().strftime('%Y-%m-%dT%H:%M:%S')
+            payload = {
+                'exp': time + timedelta(days=0, seconds=5),
+                'iat': time,
+                'user': self.json()
+            }
+            return jwt.encode(
+                payload,
+                app.config.get('SECRET_KEY'),
+                algorithm='HS256'
+            )
+        except Exception as e:
+            return e
+
+    @staticmethod
+    def decode_auth_token(auth_token):
+        try:
+            payload = jwt.decode(
+                auth_token,
+                app.config.get('SECRET_KEY')
+            )
+            return payload['user']
+        except jwt.ExpiredSignatureError:
+            return 'Signature expired . Please log in again.'
+        except jwt.InvalidTokenError:
+            return 'Invalid token. Please log in again.'