undefine port and .env file

[bennyadr]

hi,There....i try to run the script but found error..... at server : siad "running on undefined port , and when i look at the code, found like this : import 'dotenv/config';
import app from './app';

app.listen(process.env.PORT, () => {
console.log(Server up on port ${process.env.PORT}!);
}); at index.js

Can You please share the .env file ? ..... thanks a lot

[bennyadr]

i mean $ babel-node src/index.js
Server up on port undefined!