Generate QR Code - Codenull

Data
The value to be encoded into the QR code. It can be any valid JavaScript value (object, string, number, etc.). It will be automatically converted to a string using JSON.stringify. Options (optional)
You can provide custom options to control the appearance and behavior of the QR code. Some useful options include:

errorCorrectionLevel: 'L' | 'M' | 'Q' | 'H' – Error correction capability (default: 'M')
margin: number – Margin around the QR code in modules
scale: number – Scale factor for the image size
width: number – Fixed width of the QR code

For a full list of available options, refer to the qrcode options documentation. Returns
A Promise<string> that resolves to a Data URL representing the QR code image in PNG format. Sending an object

const generateQrCode = require("./utils/qrCodeGenerator").default;

const data = {
  id: 123,
  name: "Product A",
  url: "https://example.com/item/123",
};

// Optional
const options = {
  errorCorrectionLevel: "H",
  margin: 2,
  scale: 8,
};

generateQrCode(data, options)
  .then((qrCodeDataUrl) => {
    console.log(qrCodeDataUrl); // Outputs: data:image/png;base64,...
  })
  .catch((error) => {
    console.error("QR code generation failed:", error);
  });

Sending an URL

const generateQrCode = require("./utils/qrCodeGenerator").default;

const targetUrl = "https://example.com/my-site";

generateQrCode(data)
  .then((qrCodeDataUrl) => {
    console.log(qrCodeDataUrl); // Outputs: data:image/png;base64,...
  })
  .catch((error) => {
    console.error("QR code generation failed:", error);
  });

📧 Sending the QR Code via Email You can send the generated QR code either as an attachment or inline image in the email body using the sendEmail utility. ✅ Option 1: Send as an Attachment

const generateQrCode = require("./utils/qrCodeGenerator").default;
const sendEmail = require("./utils/mailSender").default;

const sendQrByEmail = async (options) => {
  // 1. Generate the QR code Data URL
  const targetUrl = "https://example.com/my-site";
  const qrDataUrl = await generateQrCode(targetUrl);

  // Strip the "data:image/png;base64," prefix from the data URL to get the base64 image
  const base64Image = qrDataUrl.split(",")[1];

  // 2. Prepare common email options
  const emailOpts = {
    from: "",
    to: "",
    subject: "Your Personalized QR Code",
    message: `
      <p>Hello!</p>
      <p>Thanks for using our service. Here’s your QR code:</p>
      <p>Scan it with any QR reader to get your information.</p>
    `,
    attachments: [
      {
        filename: "qrcode.png",
        content: base64Image,
        encoding: "base64",
      },
    ],
  };

  // 3. Send the email
  await sendEmail(emailOpts);
};

sendQrByEmail(options);

✅ Option 2: Send as Inline Image in the Email Body

const generateQrCode = require("./utils/qrCodeGenerator").default;
const sendEmail = require("./utils/mailSender").default;

const sendQrByEmail = async (options) => {
  // 1. Generate the QR code Data URL
  const targetUrl = "https://example.com/my-site";
  const qrDataUrl = await generateQrCode(targetUrl);

  // 2. Prepare common email options
  const emailOpts = {
    from: "",
    to: "",
    subject: "Your Personalized QR Code",
    message: `
      <p>Hello!</p>
      <p>Thanks for using our service. Here’s your QR code:</p>
      <img src="${qrDataUrl}" alt="QR Code" style="max-width:300px;" />
      <p>Scan it with any QR reader to get your information.</p>
    `,
  };

  // 3. Send the email
  await sendEmail(emailOpts);
};

sendQrByEmail(options);