Have you had experience developing applications using Express.js?

Yes, I have worked with Express.js to create server applications on Node.js. Express is a minimalist and flexible framework that allows for quick routing setup, request handling, and middleware integration.

Example of a simple server on Express:

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

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

app.listen(3000, () => {
  console.log('Server running on port 3000');
});

I used Express for creating REST APIs, handling JSON requests, as well as for database integration and authentication middleware.