How do I implement file-based caching in Node.js?

How do I implement file-based caching in Node.js?

To implement file-based caching in Node.js, you can use the 'fs' module to read and write cache files. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

const fs = require('fs');
const cacheFile = 'cache.json';

function getCachedData(key) {
    if (fs.existsSync(cacheFile)) {
        const data = JSON.parse(fs.readFileSync(cacheFile));
        return data[key];
    }
    return null;
}

function setCachedData(key, value) {
    let data = {};
    if (fs.existsSync(cacheFile)) {
        data = JSON.parse(fs.readFileSync(cacheFile));
    }
    data[key] = value;
    fs.writeFileSync(cacheFile, JSON.stringify(data));
}

This code allows you to get and set cached data using a JSON file.

What are the benefits of using file-based caching?

File-based caching can improve performance by reducing the need to fetch data from a database or external API repeatedly. It also allows for persistence across server restarts.