refactor(backend): replace console logs with Winston logger

backend/logger.js

@@ -0,0 +1,17 @@
+const { createLogger, format, transports } = require('winston');
+const { combine, timestamp, printf, colorize, errors } = format;
+
+const logFormat = printf(({ level, message, timestamp, stack }) => {
+  const stackTrace = stack ? `\n${stack}` : '';
+  return `${timestamp} ${level}: ${message}${stackTrace}`;
+});
+
+const logger = createLogger({
+  level: process.env.LOG_LEVEL || (process.env.NODE_ENV === 'production' ? 'info' : 'debug'),
+  format: combine(errors({ stack: true }), timestamp(), logFormat),
+  transports: [
+    new transports.Console({ format: combine(errors({ stack: true }), colorize(), timestamp(), logFormat) }),
+  ],
+});
+
+module.exports = logger;

backend/package.json

@@ -6,7 +6,6 @@
     "dev": "nodemon server.js",
     "start": "node server.js",
     "test": "jasmine spec/**/*.spec.cjs"
-
   },
   "keywords": [],
   "author": "",
@@ -22,6 +21,7 @@
     "mongoose": "^8.8.2",
     "passport": "^0.7.0",
     "passport-local": "^1.0.0",
+    "winston": "^3.19.0",
     "zod": "^4.4.3"
   },
   "devDependencies": {

backend/server.js

@@ -9,6 +9,8 @@ const cors = require('cors');
 // Passport configuration
 require('./config/passportConfig');
 
+const logger = require('./logger');
+
 const app = express();
 
 // CORS configuration
@@ -30,10 +32,10 @@ app.use('/api/auth', authRoutes);
 
 // Connect to MongoDB
 mongoose.connect(process.env.MONGO_URI, {}).then(() => {
-    console.log('Connected to MongoDB');
+    logger.info('Connected to MongoDB');
     app.listen(process.env.PORT, () => {
-        console.log(`Server running on port ${process.env.PORT}`);
+        logger.info(`Server running on port ${process.env.PORT}`);
     });
 }).catch((err) => {
-    console.log('MongoDB connection error:', err);
+    logger.error('MongoDB connection error', err);
 });