Data loading fails when inserting a file of products in my Node server.js

I am trying to load some product data into a Mongodb database before the Node server starts, I export the data loader in server.js. The failure is due to a duplicate key. First, I’m a newbie when it comes to Node. When I run the file on its own it loads the data without any issues. It only fails when I include in server.js

Here is the code for server.js

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

     const http = require("http");
     http.globalAgent = new http.Agent({
       keepAlive: true
     });
     const connectDbi = require("./config/prod-config");
     connectionDbi();

     const router = require("./routes/productRoutes");
     //Get the data loader here
     const loader = require("./loader/dbLoader");
     //Load the products here
     loader.productsLoader();

     app.use(express.json());
     app.use("/api/v2/products", router);

     app.listen(3000, () => console.log("Example app is listening on port 3000."));

Here is how the data is loaded

 const fs = require("fs");
 const Product = require("../models/Product");

   const products = JSON.parse(
      // Read products from a file
   );


   exports.productsLoader = () => {
     Product.create(products)
        .then(() => console.log("Products loaded"))
        .catch((err) => console.log(err));
   };

Unfortunately, the data starts getting loaded and then fails with a duplicate key after the first product is loaded. There is no other place except in server.js where this loader code is imported and used. How can a duplicate key arise from the loader? How can I prevent this from happening? Is there a better way to ensure this does not happen. I think this behavior may probably be because of the lifecycle process in Node, I’m quite new to Node.js

Here is the error:

Example app is listening on port 3000.
Connected to host localhost
MongoServerError: E11000 duplicate key error collection: products-db index: id_1 dup key: { 
product_id: 667070 }
at c:mongo-projectnode_modulesmongodbliboperationsinsert.js:51:33