How to use

ProcessEnv

function

in

1/process

mongoose.connect(`mongodb+srv://${process.env.MONGO_USER}:${process.env.MONGO_PASSWORD}@cluster0-hiv7m.mongodb.net/${process.env.MONGO_DB}?retryWrites=true`, { useNewUrlParser: true })
  .then(() => { app.listen(PORT); })
  .catch((err) => console.log(err));