Answer by Julio Peña for Import class from Node.js in normal JavaScript

I think only in two methods for solved your problem

METHOD 1

Module1.js

class HelloWorld {  getHelloWorld() {    return 'Hello World';  }}module.exports = HelloWorld

Module2.js

const HelloWorld = require('./module1.js');const helloWorld = new HelloWorld();

METHOD 2Node <= v12 (Extension file: .msj and run it like node --experimental-modules module2.mjs)

module1.mjs

export default class HelloWorld {    getHelloWorld() {        return 'Hello World';    }}

module2.msj

import HelloWorld from './module1.mjs';const helloWorld = new HelloWorld();console.log(helloWorld.getHelloWorld());

METHOD 2Node >= v13 (Extension files: .msj or Add { "type": "module" } in the package.json)

module1.mjs or module1.js if you add { "type": "module" } in the package.json

export default class HelloWorld {    getHelloWorld() {        return 'Hello World';    }}

module2.mjs or module2.js if you add { "type": "module" } in the package.json

import HelloWorld from './module1.mjs';const helloWorld = new HelloWorld();console.log(helloWorld.getHelloWorld());

NOTE: If you are interested in knowing the difference between "module.exports vs export default", this topic can help you module.exports vs. export default in Node.js and ES6