我已经为使用node.js的人开发了几个Shopify定制应用程序，老实说，这是一个反复试验的过程。经过反复试验，我得到了以下代码：

/* GET home page. */
router.get('/', adminMiddleware, function (req, res, next) {
    const shop = req.query.shop;

    if (req.query.session) {
        // if we're here, that means the app was clicked on in the shopify admin panel
        return res.send({hello: 'world'});
    }

    if (shop) {
        // if we're here, that means this is install initialization
        const state = nonce();
        const redirectUri = forwardingAddress + '/shopify/callback';
        const installUrl = 'https://' + shop +
            '/admin/oauth/authorize?client_id=' + apiKey +
            '&scope=' + scopes +
            '&state=' + state +
            '&redirect_uri=' + redirectUri;

        res.cookie('state', state);
        res.redirect(installUrl);
    } else {
        return res.status(400).send('Missing shop parameter. Please add ?shop=your-development-shop.myshopify.com to your request');
    }
});

因此，根据我的尝试和错误（我对此完全没有信心），我将在以下两种情况下最终进入我的Shopify路线的根目录（如Shopify partner dashboard上的应用程序URL设置中所定义）：

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