How can I perform file I/O operations using async in JavaScript?

How can I perform file I/O operations using async in JavaScript?

You can use the fs.promises API in Node.js to perform asynchronous file I/O operations. For example, you can use fs.readFile and fs.writeFile with async/await.

Can you show me a code example?

Sure! Here's a simple example:

const fs = require('fs').promises;

async function readAndWriteFile() {
    try {
        const data = await fs.readFile('input.txt', 'utf8');
        console.log(data);
        await fs.writeFile('output.txt', data);
    } catch (error) {
        console.error('Error:', error);
    }
}

readAndWriteFile();

What happens if the file doesn't exist?

If the file doesn't exist, the fs.readFile method will throw an error, which you can catch in the catch block.

Can I use this in a web browser?

No, the fs module is specific to Node.js. For file operations in the browser, you would typically use the File API or fetch API.