Stream local pdf file from nodejs (restify) server to client

stream-pdf-from-nodejs.js

server.get('/downloadPdf/:fileData', function (req, res) {
    // config
    var fileData = Buffer.from(req.params.fileData, 'base64');
    var menuData = JSON.parse(fileData.toString());
    var userName = menuData.userName;
    var menuName = slug(menuData.menuName);
    var fileName = userName + "-" + menuName + PDF_EXT;
    var filePath = PDF_PATH + fileName;

    // process headers
    res.writeHead(200, {
        "Content-Type": 'application/octet-stream',
        "Content-Disposition": "attachment; filename=" + fileName
    });

    // process Data
    var readStream = fileSystem.createReadStream(filePath);
    readStream.pipe(res);
});