How do I use memory cache in Express.js?

How do I use memory cache in Express.js?

You can use the node-cache package to implement memory caching in your Express.js application. Would you like a code example?

Yes, please provide a code example.

Sure! First, install the package using npm install node-cache. Then, you can set up caching like this:

const express = require('express');
const NodeCache = require('node-cache');

const app = express();
const cache = new NodeCache();

app.get('/data', (req, res) => {
    const cachedData = cache.get('myData');
    if (cachedData) {
        return res.json(cachedData);
    }
    // Simulate fetching data
    const data = { message: 'Hello, world!' };
    cache.set('myData', data, 100); // Cache for 100 seconds
    res.json(data);
});

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

This code caches the response for 100 seconds.

What happens if the cache expires?

If the cache expires, the next request will fetch fresh data and store it in the cache again. This ensures that your application always has up-to-date information.