Generate QR Code and save to mongodb

qrCode.js

'use strict';

const qr = require('qr-image');
const mongoose = require('mongoose');
const Grid = require('gridfs');

const json = {
    email: 'john@doe.com',
    name: 'John Doe'
};

let image = qr.imageSync(JSON.stringify(json), { type: 'png', size: 10 });
let gfs = Grid(mongoose.connection.db, mongoose.mongo);
let fileId = new mongoose.mongo.ObjectId();

gfs.writeFile({ _id: fileId, content_type: 'image/png' }, image, function (err, file) {
    console.log(file);
});