Generate html output before rendering response with expressjs

generate-output-html-expressjs.js

function(err, html) {
    let outputFolder = path.resolve('output');

    // Check if folder does not exist
    if ( !fs.existsSync(outputFolder) ) {
        // Create folder
        fs.mkdirSync(outputFolder);
    }

    // Write html output to file
    fs.writeFileSync(path.join(outputFolder, 'output.html'), html);

    // Send html with response
    res.send(html);
}