mongoose.connect(env.dbURI);
mongoose.connection.on("error", (err) => {
    console.log("Can't connect to database\n\n", err);
    process.exit(1);
});
mongoose.connection.on("open", () => {
    console.log("Connect to database");
    app.listen(env.PORT, () => {
        console.log("Server listen port", env.PORT);
    });
});