text: const mongoose = require('mongoose')
  const dbUrl = process.env.DB_URL;
  
  mongoose.connect (dbUrl, {
      useUnifiedTopology: true, 
      useNewUrlParser: true,
  });
  
  const db = mongoose.connection;
  db.on("error", console.error.bind(console, "Connection Error!"));
  db.once("open", ()=>{
      console.log("Database Connected!");
  });