#1, подключила базу, настроила сервер

config.js

+const path = require("path");
+
+const rootPath = __dirname;
+
+module.exports = {
+  rootPath,
+  uploadPath: path.join(rootPath, "public", "uploads"),
+  db: {
+    name: "shop",
+    url: "mongodb://localhost"
+  }
+};

server.js

+const express = require("express");
+const cors = require("cors");
+const mongoose = require("mongoose");
+const products = require("./app/products");
+const categories = require("./app/categories");
+const users = require("./app/users");
+const config = require("./config");
+const app = express();
+const PORT = 8000;
+
+app.use(cors());
+app.use(express.static("public"));
+app.use(express.json());
+
+mongoose.connect(`${config.db.url}/${config.db.name}`, {useNewUrlParser: true})
+  .then(() => {
+    console.log("Mongoose connected!");
+    app.use("/products", products());
+    app.use("/categories", categories());
+    app.use("/users", users());
+
+    app.listen(PORT, () => {
+      console.log("Server started at http://localhost:" + PORT);
+    });
+  });
+
+
+
+