How do I use the Node.js File System module for asynchronous operations?

Can you explain how to use the File System module in Node.js for asynchronous file operations?

Sure! The File System module in Node.js allows you to work with the file system on your computer. For asynchronous operations, you can use methods like fs.readFile() and fs.writeFile(). These methods take a callback function that gets executed once the operation is complete.

Can you show me an example of reading a file asynchronously?

Absolutely! Here's a simple example:

const fs = require('fs');

fs.readFile('example.txt', 'utf8', (err, data) => {
    if (err) {
        console.error('Error reading file:', err);
        return;
    }
    console.log('File content:', data);
});

What happens if the file doesn't exist?

If the file doesn't exist, the err parameter in the callback will contain an error object. You can handle this error by checking if err is truthy and then logging or processing the error accordingly.

Can I use promises instead of callbacks?

Yes, you can! The File System module also provides promise-based methods. For example, you can use fs.promises.readFile() which returns a promise that resolves with the file content.