text: const express = require("express");
  const path = require("path");
  const mongoose = require("mongoose");
  const routes = require("./routes");
  const app = express();
  const PORT = process.env.PORT || 3001;
  
  //Configure body parsing for AJAX requests
  app.use(express.urlencoded({ extended: true }));
  app.use(express.json());
  // Serve up static assets (usually on heroku)
  if (process.env.NODE_ENV === "production") {
    app.use(express.static("client/build"));
  }
  
  app.use(routes);
  
  mongoose.connect(
    process.env.MONGODB_URI || "mongodb://localhost/GoogleBooks", {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
    useFindAndModify: false
  });
  
  app.listen(PORT, () => {
    console.log(`🌎 ==> API server now on port ${PORT}!`);
  });
  