index.js

const express = require('express');
const morgan = require('morgan');
const bodyParser = require('body-parser');
const BooktonicaDatabase = require('./src/booktonica-database');

const DEFAULT_DB_NAME = 'booktonica';
const dbName = process.env.DB_NAME || DEFAULT_DB_NAME;
/**
 * Creates a new database object.
 * Add new database queries to that class.
 *
 * You can run this app like:
 * `DB_NAME=osito npm start` and it will
 * use the DB named osito instead of DEFAULT_DB_NAME.
 */
const db = new BooktonicaDatabase(dbName);

const api = express();

// Middlewares
api.use(morgan('tiny'));
api.use(bodyParser.json());

api.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", process.env.REACT_CLIENT_ORIGIN); // update to match the domain you will make the request from
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  next();
});

/**
 * This will just print the incoming request bodies
 * which is useful for debugging. You can skip it if you want
 * by removing
 */
const bodyDebugMiddleware = require('./src/body-debug-middleware');
api.use(bodyDebugMiddleware);

// GET /books
api.get('/books', (_unused, res, next) =>
  db
    .getAllBooks()
    .then(books => res.send(books))
    .catch(next)
);

const PORT = process.env.PORT || 3001;

// sanityCheck will make sure the DB is working before listening
db.sanityCheck().then(() => {
  api.listen(PORT, () => {
    console.log(`
    
      📚 booktonica express api listening on port ${PORT}
      
    `);
  });
});