How would you rate your competence in working with Express.js for web application development?

Express.js is a minimal and flexible Node.js framework that allows for quick creation of web applications and APIs. I can create routes, use middleware for request processing, work with URL parameters and queries, as well as integrate templating engines and databases.

Example of a simple server on Express.js:

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

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

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

I am also familiar with error handling, static files, and CORS configuration. I can create RESTful APIs and work with JSON requests.