diff --git a/back-end/src/app.mjs b/back-end/src/app.mjs
index 19e266f..56421e8 100644
--- a/back-end/src/app.mjs
+++ b/back-end/src/app.mjs
@@ -1,18 +1,16 @@
 import express from 'express';
 import url from 'url';
 import path from 'path';
-// middlewares
 import multer from "multer";
-import bcrypt from 'bcryptjs';
 import cors from 'cors';
-import "dotenv/config";
 import dotenv from 'dotenv';
 import morgan from 'morgan';
 import session from 'express-session';
 import mongoose from 'mongoose';  
 import { body, validationResult }  from 'express-validator';
 import jwt from 'jsonwebtoken';
-
+import passport from 'passport'
+import CustomJwtStrategy from './config/jwt-config.mjs';
 // routes
 import loginRouter from './routes/loginRouter.mjs';
 import registerRouter from './routes/registerRouter.mjs';
@@ -23,11 +21,9 @@ import getpieceRouter from './routes/getpieceRouter.mjs';
 import resetpasswordRouter from './routes/resetpasswordRouter.mjs';
 import resetemailRouter from './routes/resetemailRouter.mjs';
 import searchArtsRouter from './routes/searchArtsRouter.mjs';
-
 import {addFavListRouter,favListRouter, getArts} from './routes/modifyFavListRouter.mjs'
-import { configDotenv } from 'dotenv';
-const app = express();
 
+const app = express();
 
 // use the morgan middleware to log all incoming http requests
 app.use(morgan("dev"));
@@ -66,7 +62,11 @@ app.use(session({
 }))
 console.log('Session secret:', process.env.SESSION_SECRET);
 
-// other middlewares
+// jwt strategy
+passport.use(CustomJwtStrategy)
+
+// initialize passport
+app.use(passport.initialize())
 
 // routes that does not need authentication
 // app.post("/getpiece", getpieceRouter);
@@ -101,8 +101,6 @@ const passwordValidationRules = [
     // Optionally, include checks for special characters or uppercase letters
 ];
 
-
-
 // routes that needs authentication
 // Account routes
 app.patch("/changeusername", usernameValidationRules, changeusernameRouter); //Finished
diff --git a/back-end/src/config/jwt-config.mjs b/back-end/src/config/jwt-config.mjs
index 9904129..930aa28 100644
--- a/back-end/src/config/jwt-config.mjs
+++ b/back-end/src/config/jwt-config.mjs
@@ -26,6 +26,8 @@ const jwtVerifyToken = async function (jwt_payload, done) {
   }
 }
 
-const jwtStrategy = new JwtStrategy(jwtOptions, jwtVerifyToken)
+const CustomJwtStrategy = () => {
+  return new JwtStrategy(jwtOptions, jwtVerifyToken)
+}
 
-export default jwtStrategy
\ No newline at end of file
+export default CustomJwtStrategy
\ No newline at end of file