How do I use compression in Express.js?

How do I use compression in Express.js?

You can use the 'compression' middleware in Express.js to reduce the size of the response body. First, install it using npm: npm install compression. Then, require it in your app and use it as middleware.

Can you show me a code example?

Sure! Here's a simple example:

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

const app = express();
app.use(compression());

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

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

What types of responses does it compress?

It compresses responses that are sent with a content type that can be compressed, such as text, HTML, JSON, and XML. However, it won't compress already compressed files like images or videos.

Are there any performance considerations?

Yes, while compression can reduce bandwidth usage, it may add some CPU overhead. It's best to test and monitor performance to find the right balance for your application.