How to use ES6 import on Node.js project (Node.js/IISNode)

First, create a run.cjs file and update this file to import your Node.js site entry point file (server.js) and configure it as the iisnode's entry point ( in web.config).

run.cjs:

import ("./server.js");

The cjs file extension is important because it tells Node that this file is not an ES module, as it would expect because of "type": "module" in the package.json. It allows other CommonJS files to include our new file - namely iisnode's interceptor.js. It again imports the server.js which then runs fine as ES module.

Below is a demo entry point file server.js.

server.js:

import express from 'express';

const app = express ();

app.get ('/',(req, res) => { const body = "hello this is a ES6 import demo project" // Adds header res.append ('Content-Type', 'text/plain;charset=utf-8'); res.append ('Connection', 'keep-alive') res.append ('Set-Cookie', 'divehours=fornightly') res.append ('Content-Length', Buffer.byteLength (body, 'utf-8')); res.status (200).send (body); })

const PORT = process.env.PORT;

app.listen (PORT,() => { console.log (Running on PORT ${PORT}); })

The below code will set your site default routing for iisnode.

web.config:

<?xml version="1.0" encoding="UTF-8"?> 
<configuration>
   <system.webServer> 
       <handlers>
           <add name="iisnode" path="run.cjs" verb="*" modules="iisnode" />
       </handlers> 
      <rewrite> 
           <rules> <!-- All other URLs are mapped to the node.js site entry point > 
                 <rule name="DynamicContent">
                       <conditions>
                          <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="True"/> 
                       </conditions> 
                          <action type="Rewrite" url="run.cjs"/> 
                 </rule> 
          </rules> 
     </rewrite> 
  </system.webServer> 
</configuration>

Import using ES modules: Since Node v8.5, developers have been able to run variations of support for the ES modules specification using the --experimental-modules flag. These modules can be defined in either.mjs files or.js files also by adding { "type": "module" } in the package.json.

package.json:

{ "name": "index", "version": "1.0.0", "description": "", "main": "server.js", "type": "module", "scripts": { "test": "echo \"Error: no test specified\" && exit 1", "start": "node --experimental-modules server.js" }, "keywords": [], "author": "", "license": "ISC", "dependencies": { "express": "^4.18.1" } }

Now your site will auto redirect to run.cjs file and auto enter your site entry point file (server.js).