actualziacon del .env

app.js

@@ -4,10 +4,11 @@ var cors = require('cors');
 app.get('/', function(req, res) {
     res.send('Hello World!');
 });
+require('dotenv').config()
 app.use(cors());
 app.use(express.json()) // for parsing application/json
 app.use(express.urlencoded({ extended: true }))
 app.use(require('./routes/index.js'))
-app.listen(3000, function() {
-    console.log('Example app listening on port 3000!');
+app.listen(process.env.PORT, function() {
+    console.log('Example app listening on port ' + process.env.PORT + '!');
 });