diff --git a/requirements.txt b/requirements.txt
index e732cff..b19e214 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 Flask==2.2.2
 pytest==7.2.1
-PyJWT==2.6.0
+sqlalchemy==2.0.3
\ No newline at end of file
diff --git a/src/generate_api_token.py b/src/generate_api_token.py
index a99f80f..35f00af 100644
--- a/src/generate_api_token.py
+++ b/src/generate_api_token.py
@@ -1,40 +1,45 @@
-import jwt
-import json
-
-
-def generate_api_token( payload, secret):
-    header = {"alg": "HS256", "typ": "JWT"}
-    encoded_jwt = jwt.encode(payload, secret, algorithm='HS256', headers=header)
-    return json.dumps({"token": encoded_jwt})
-
-
-
-def verify_api_token(token, secret):
-    try:
-        decoded_jwt = jwt.decode(token, secret, algorithms=["HS256"])
-        return json.dumps({"payload": decoded_jwt})
-    except:
-        return {"error": "Invalid signature:"}
-    
-    
-    
-    
-
-# example
-
-payload = {"sub": "12364567890", "user": "John Doe"}
-secret = "Ravipassword" #securely store secret in production
-
-jwt_json = generate_api_token( payload, secret)
-print(jwt_json)
-
-jwt_dict = json.loads(jwt_json)
-token = jwt_dict["token"]
-
-decoded_jwt = verify_api_token(token, secret)
-print(decoded_jwt)
-
-
-
-
-
+import random
+import string
+from sqlalchemy import create_engine, Column, String
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+# db configuration
+engine = create_engine('sqlite:///Tokens.db', echo=True)
+Session = sessionmaker(bind=engine)
+
+# Create a base class for the ORM model
+Base = declarative_base()
+
+class ApiToken():
+    def __init__(self):
+        self.token = self.Token()
+
+    class Token(Base):
+        __tablename__ = 'Tokens'
+        token_text = Column(String, primary_key=True)
+
+    def generate_token(self):
+        '''
+        generate random alpha-numeric string with length 50 and check whether it already exist or not
+        '''
+        token = ''.join(random.choices(string.ascii_letters+string.digits, k=40))
+        with Session() as session:
+            result = session.query(self.Token).filter_by(token_text=token).first()
+            while result:
+                token = ''.join(random.choices(string.ascii_letters+string.digits, k=50))
+                result = session.query(self.Token).filter_by(token_text=token).first()
+            new_token = self.Token(token_text=token)
+            session.add(new_token)
+            session.commit()
+            return token
+
+    def is_valid_token(self, token_to_check):
+        with Session() as session:
+            result = session.query(self.Token).filter_by(token_text=token_to_check).first()
+        if result:
+            return True
+        return False
+
+# create the table (if it doesn't already exist)
+Base.metadata.create_all(engine)