FOR DEVELOPERS

How to Create a QR Code Using JavaScript

Author

Onwuemene Joshua
Joshua is a frontend developer, a WordPress developer and a Technical writer. He has collaborated on projects which required his Html, CSS/SASS, TailwindCSS and JavaScript skills. He writes on frontend development explaining difficult concepts in a beginner-friendly manner.

Frequently Asked Questions

What is the difference between a barcode and a QR code?

A barcode stores data in one dimension (can be read horizontally) whereas a QR code can store data in two dimensions (can be read horizontally and vertically).

How can QR codes be scanned and what types of devices can read them?

A QR code scanner app can be used to scan QR codes on a smartphone or tablet. To scan, follow the steps below.

Download a QR code reader from the app store.
Open the app and aim your device’s camera at the QR code to scan it.
The QR code will be instantly recognized by the scanning app which will then show the data contained in it.

You can scan QR codes on some smartphones without downloading a third-party app. Just launch the camera app and aim it at the QR code to scan it. Other devices like digital cameras and barcode scanners can also read QR codes.

What types of information can be stored in a QR code, and how much data can it hold?

In addition to text and links, QR codes can hold vCard data, calendar events, wi-fi network information, phone numbers, email addresses, and more. A QR code's capacity for data storage is influenced by its size, complexity, and the type of data being stored.

In general, QR codes can store up to 2,953 bytes of binary data, 4,296 alphanumeric characters, or 7,089 numeric characters. The capacity can change depending on the capabilities of the scanner app and the QR code generator being used.

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