Sending a generated PNG in NodeJS/Express

send-qrcode.ts

import healthCardQR from 'express';
import * as shc from '../smartHealthCard';

export const create = async (req: healthCardQR.Request, res: healthCardQR.Response) => {
    try {
        var qrCodeImage = await shc.queryGetQRCode(req.params.id);
        // remove data:image prefix in image object 
        const img = Buffer.from(qrCodeImage.split(",")[1], 'base64');

        res.contentType('image/png');
        res.setHeader('Content-Length', img.length);
        res.end(img); // Send the file data to the browser.
    } catch (err) {
        res.statusCode = 500;
        res.send("Error rendering QR code for this id.");
    }
};