Get download progress in Node.js with request

Question

I\'m creating an updater that downloads application files using the Node module request. How can I use chunk.length to estimate the remaining file

Answer 1

If you are using "request" module and want to display downloading percentage without using any extra module, you can use the following code:

function getInstallerFile (installerfileURL) {

    // Variable to save downloading progress
    var received_bytes = 0;
    var total_bytes = 0;

    var outStream = fs.createWriteStream(INSTALLER_FILE);

    request
        .get(installerfileURL)
            .on('error', function(err) {
                console.log(err);
            })
            .on('response', function(data) {
                total_bytes = parseInt(data.headers['content-length']);
            })
            .on('data', function(chunk) {
                received_bytes += chunk.length;
                showDownloadingProgress(received_bytes, total_bytes);
            })
            .pipe(outStream);
};

function showDownloadingProgress(received, total) {
    var percentage = ((received * 100) / total).toFixed(2);
    process.stdout.write((platform == 'win32') ? "\033[0G": "\r");
    process.stdout.write(percentage + "% | " + received + " bytes downloaded out of " + total + " bytes.");
}