Fixed Cors Problem via right way

Author: OzanAlpay

app.js

@@ -3,6 +3,7 @@ var path = require('path');
 var cookieParser = require('cookie-parser');
 var logger = require('morgan');
 var helmet = require('helmet');
+var cors = require('cors');
 
 var indexRouter = require('./routes/index')
 var electionRouter = require('./routes/electionresults')
@@ -15,16 +16,12 @@ mongoose.connect(mongoDB, { useNewUrlParser: true, dbName: "Elections" })
 var db = mongoose.connection
 db.on('error', console.error.bind(console, 'MongoDB Connection Problem'))
 app.use(helmet())
+app.use(cors({ credentials: true, origin: true }))
 app.use(logger('dev'));
 app.use(express.json());
 app.use(express.urlencoded({ extended: false }));
 app.use(cookieParser());
 app.use(express.static(path.join(__dirname, 'public')));
-app.use(function (req, res, next) {
-  res.header("Access-Control-Allow-Origin", "*");
-  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
-  next();
-});
 app.use('/', indexRouter)
 app.use('/electionresults', electionRouter);
 

package-lock.json

@@ -12,6 +12,7 @@
   },
   "dependencies": {
     "cookie-parser": "~1.4.3",
+    "cors": "^2.8.5",
     "debug": "~2.6.9",
     "express": "~4.16.0",
     "helmet": "^3.18.0",