JavaScript QR Code Generator

QR Code is becoming very popular nowadays as it is used to hide information from us humans and can only be read by devices like scanner, Pretty cool right?

Do you want to make your own QR Code Generator ?

I'm going to explain exactly how you can build your own QR Code generator using JavaScript in just one library and a little code.

Excited? Let's learn how to do it.

How to make a JavaScript QR Code Generator using JavaScript

For generating QR code in JavaScript, we will be using a 3rd party Javascript library Qrious.

Here is the code for creating a simple form for the user to input any value, and then the Javascript code for generating QR code. (Click on the Image to preview the code)

In the code above, we have initialized the QRious object with the default value https://studytonight.com and the <canvas> tag id in which the QR code will be rendered.

To use the QRious Javascript library, we have included the script in our code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/qrious/4.0.2/qrious.min.js"></script>

We have also defined the generateQRCode() function to generate custom QR code for the value input.

There many properties that can be used to modify the color, size, etc. of the QR code, for example:

qr.set({
    background: 'green',
    backgroundAlpha: 0.8,
    foreground: 'blue',
    foregroundAlpha: 0.8,
    padding: 25,
    size: 500
});

With the above code, the background color for the QR code will be green, and the QR code color will be blue, the padding will be 25px and the height/width of the QR code will be 500px.

Conclusion

This is how you can make a simple but powerful QR Code generator with the help of the JavaScript library Qrious.

With the knowledge gained from this article, you can now create your own JavaScript QR code generator and customize it to suit your specific needs.

Whether you want to add QR code generation to your website, create a tool for your business or personal use, or simply learn more about JavaScript and QR codes, this article has provided you with a solid foundation to get started.

I hope you find this simple tutorial useful. If you are facing any issue, do share in the comment section below.

Frequently Asked Question (FAQs)

1. Which JavaScript library for generating QR code?

You can choose from multiple options. We have used Qrious Javascript library but you can also use Qr Code.js which is also a Javascript library.

2. What programming language is used for QR code?

You can use any language like Python or Javascript, it really depends on you. You can follow the above tutorial to get an idea of how to create a QR Code using Javascript.

3. How do I create a QR code in HTML?

You can create a QR code in HTML indirectly as we have to design the interface to work with Javascript but the actual work is done by Javascript which is used to generate the QR code.

4. How to create dynamic QR code in JavaScript?

To create a dynamic QR code in JavaScript, follow these simple steps:

1. Include a QR code library in your HTML file, such as qrcode.js, by adding a script tag with the source link.
2. Define the data you want to encode in the QR code, such as a URL or text message.
3. Use JavaScript to instantiate the QR code generator from the library, passing in the data as a parameter.
4. Optionally, you can customize the QR code by setting various options, such as size, color, and error correction level.
5. Finally, append the generated QR code image to your HTML page, making it visible to the user.

5. Which is better static or dynamic QR code?

Both static and dynamic QR codes have their advantages and are suitable for different use cases:

Static QR codes:

• Static QR codes contain fixed information, such as a URL, text, or contact information.
• They are quick and easy to generate and can be used for simple purposes like sharing website links, contact details, or basic information.
• Once generated, static QR codes cannot be changed, meaning the information encoded in them cannot be updated without generating a new QR code.
• They are ideal for situations where the information being shared is unlikely to change frequently, and where a simple, one-time scan is sufficient.

Dynamic QR codes:

• Dynamic QR codes contain dynamic information that can be updated after generation, such as a URL, text, or contact information.
• They require a backend server to generate and manage the QR codes, allowing for real-time updates and changes to the encoded information.
• Dynamic QR codes are useful in situations where the information being shared may change frequently, such as for marketing campaigns, inventory management, or event registration.
• They provide flexibility and scalability, as the encoded information can be updated without needing to generate a new QR code every time.

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