Here's an example of a simple Node.js web app using the Express framework:


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

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.listen(3000, () => {
  console.log('Example app listening on port 3000!');
});


This code creates a new Express application and sets up a single route, the root '/' route, which sends a response with the text "Hello World!". The app listens on port 3000, so if you run this code and visit http://localhost:3000 in your web browser, you'll see the "Hello World!" message displayed.
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