How to fix issue if autocomplete or intellisense does not work in vscode for express.js

If the below line is used in the javascript code:
const express = require(express);

then autocomplete / intellisense will not work. It will not display the relevant methods as shown in the image below.

This is the correct code to use:
const express = require("express");

The quotation marks make the difference and the following image shows the listen() method:

To enable intellisense for express.js see the extension to enable node.js at