Node.js Requires Chilkat v11.7.0+

Embed a QR Code in HTML as a Data URI

See more QR Code Examples

Demonstrates putting a QR code directly into an HTML page or HTML email with no separate image file. The base64 PNG returned by QrCode becomes the src of an img tag as a data URI, which is the MIME type from outputs[0].mimeType followed by the base64 from outputs[0].base64. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    var json = new chilkat.JsonObject();
    json.UpdateString("payload.text","https://www.chilkatsoft.com/");
    json.UpdateInt("render.moduleSize",5);

    var fmt = new chilkat.Formats();
    var jsonOut = new chilkat.JsonObject();
    success = fmt.QrCode("generate",json,jsonOut);
    if (success == false) {
        console.log(fmt.LastErrorText);
        return;
    }

    //  A data URI has the form  data:<MIME type>;base64,<base64 data>
    var sbHtml = new chilkat.StringBuilder();
    sbHtml.Append("<html><body><p>Scan to visit chilkatsoft.com</p><img alt=\"QR code\" width=\"");
    sbHtml.AppendInt(jsonOut.IntOf("outputs[0].width"));
    sbHtml.Append("\" height=\"");
    sbHtml.AppendInt(jsonOut.IntOf("outputs[0].height"));
    sbHtml.Append("\" src=\"data:");
    sbHtml.Append(jsonOut.StringOf("outputs[0].mimeType"));
    sbHtml.Append(";base64,");
    sbHtml.Append(jsonOut.StringOf("outputs[0].base64"));
    sbHtml.Append("\"></body></html>");

    success = sbHtml.WriteFile("qa_output/qr_page.html","utf-8",false);
    if (success == false) {
        console.log(sbHtml.LastErrorText);
        return;
    }

    console.log("image: " + jsonOut.IntOf("outputs[0].width") + " x " + jsonOut.IntOf("outputs[0].height") + " pixels");
    console.log("HTML length: " + sbHtml.Length);

    //  The page, as a browser shows it:

    //  

    //  Sample output:

    //  image: 185 x 185 pixels
    //  HTML length: 1211

}

chilkatExample();