Generate QR Code In Javascript

Hello everyone 👋, this is going to be a very short article where I will show how can we generate a QR Code for any content in JavaScript.

Obviously, I am not going to implement everything from scratch and why should one do that when we have a plethora of useful libraries in JavaScript.

I came across this awesome lightweight library or you can say a simple script qrcodejs. It is very easy to use and is reliable too.

Implementation

• Download this zip file: qrcodejs

• Extract it.

• Now you can use the qrcode.js and qrcode.min.js file in your project.

Code

Include the qrcode.js file in your HTML file.

...
<script src="./qrcode.js" defer></script>
...

Give an id to the div where you want to show the generated QR Code. Here I have used "qrcode" as my id.

...
<div id="qrcode"></div>
...

Now we will create an object from the QRCode function. Need to pass the id of the output div which is "qrcode" in this case.

var QR_CODE = new QRCode("qrcode", {
  width: 220,
  height: 220,
  colorDark: "#000000",
  colorLight: "#ffffff",
  correctLevel: QRCode.CorrectLevel.H,
});

correctLevel: L for low, M for medium, H for high.

Generate QRCode by calling the makeCode method of the QRCode object, which expects the data as its argument.

QR_CODE.makeCode("https://buymeacoffee.com/bibekkakati");

It will automatically insert the generated QRCode in the div whose id has been provided while creating the QRCode object.

Example✨

Check out the GitHub Repo.

Try it out here: Live.

Screenshot is taken from Google Lens while scanning.

Originally published on blog.bibekkakati.me

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