Узел в производстве — Советы

Всегда делайте «try…catch…» при разборе JSON.

request(options, (error, response, body) => {
    let data = {}, products = [];
    if(error){
        // handle the error here
        console.log(error);
        res.redirect('/fallback');
    }
    try {
        data = JSON.parse(body);
        products = data.productList.filter(product =>  product.instock);
    } catch(exception) {
        // handle the exception here
        console.log(exception);
        res.redirect('/fallback');
    }
    // everything is OK
    res.render('productsList', {
        products: products
    });
});