JavaScript Requires Chilkat v11.7.0+

Generate a QR Code PNG in Memory

See more QR Code Examples

Demonstrates getting a QR code image without writing a file. With no output options the result is a PNG returned as base64 in outputs[0].base64 of the response. The example decodes it into a BinData, which holds the bytes of the PNG to send in an HTTP response, store in a database, attach to an email, or save. JavaScript

var success = false;

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

var json = new CkJsonObject();
json.UpdateString("payload.text","https://www.chilkatsoft.com/");
json.UpdateInt("render.moduleSize",6);

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

console.log("format: " + jsonOut.StringOf("outputs[0].format"));
console.log("MIME type: " + jsonOut.StringOf("outputs[0].mimeType"));
console.log("image: " + jsonOut.IntOf("outputs[0].width") + " x " + jsonOut.IntOf("outputs[0].height") + " pixels");

//  outputs[0].base64 is the PNG file, base64 encoded.
var bdPng = new CkBinData();
success = bdPng.AppendEncoded(jsonOut.StringOf("outputs[0].base64"),"base64");
if (success == false) {
    console.log(bdPng.LastErrorText);
    return;
}

console.log("PNG bytes: " + bdPng.NumBytes);

//  The BinData holds the image.  Here it is simply saved.
success = bdPng.WriteFile("qa_output/qr_in_memory.png");
if (success == false) {
    console.log(bdPng.LastErrorText);
    return;
}

//  The PNG held in bdPng:

//  

//  Sample output:

//  format: png
//  MIME type: image/png
//  image: 222 x 222 pixels
//  PNG bytes: 877