What is Node.js and how does it work with Express?

What is Node.js and how does it work with Express?

Node.js is a JavaScript runtime built on Chrome's V8 engine, allowing you to run JavaScript on the server side. Express is a web application framework for Node.js that simplifies building web applications and APIs.

Can you give me an example of a simple Express server?

Sure! Here's a basic example:

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

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

app.listen(3000, () => {
  console.log('Server is running on http://localhost:3000');
});

What are some common middleware used in Express?

Common middleware in Express includes:

1. body-parser for parsing request bodies.
2. morgan for logging requests.
3. cors for enabling Cross-Origin Resource Sharing.

How do I handle errors in an Express application?

You can handle errors in Express by defining an error-handling middleware function. Here's an example:

app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).send('Something broke!');
});