const express = require('express');
const app = express();

app.get(
    '/categories/:categoryId/products/:productId',
    function (request, response) {
        let catId = request.params['categoryId'];
        let prodId = request.params['productId'];
        response.send(
            `Категория: ${catId}  Товар: ${prodId}`
        );
    }
);

app.listen(3000);