How to use

shop

function

in

ParsedQs

/* GET home page. */
router.get('/', (req, res, next) => {
 const query = Object.keys(req.query).map((key) => `${key}=${req.query[key]}`).join('&');
 if (req.query.shop) {
  Shop.findOne({ shopify_domain: req.query.shop, isActive: true }, (err, shop) => {
   if (!shop) {
    return res.redirect(`/install/?${query}`);
   }
   if (verifyOAuth(req.query)) {
    return res.render('app/app', { apiKey: config.SHOPIFY_API_KEY, appName: config.APP_NAME, shop });
   }
   return res.render('index', { title: req.query.shop });
  });
 } else {
  return res.render('index', { title: 'Welcome to your example app' });
 }
});

router.get('/', (req, res) => {
 const shopName = req.query.shop;
 const nonce = generateNonce();
 const query = Shop.findOne({ shopify_domain: shopName }).exec();
 const shopAPI = new Shopify({
  shop: shopName,
  shopify_api_key: config.SHOPIFY_API_KEY,
  shopify_shared_secret: config.SHOPIFY_SHARED_SECRET,
  shopify_scope: config.APP_SCOPE,
  nonce,
  redirect_uri: `${config.APP_URI}/install/callback`,
 });
 const redirectURI = shopAPI.buildAuthURL();

 query.then((response) => {
  let save;
  const shop = response;
  if (!shop) {
   save = new Shop({ shopify_domain: shopName, nonce }).save();
  } else {
   shop.shopify_domain = shopName;
   shop.nonce = nonce;
   save = shop.save();
  }
  return save.then(() => res.redirect(redirectURI));
 });
});

router.get('/callback', (req, res) => {
 const params = req.query;
 const query = Shop.findOne({ shopify_domain: params.shop }).exec();
 query.then((result) => {
  const shop = result;
  const shopAPI = new Shopify({
   shop: params.shop,
   shopify_api_key: config.SHOPIFY_API_KEY,
   shopify_shared_secret: config.SHOPIFY_SHARED_SECRET,