Javascript detect mobile screen size

Mobile detection has always been a crucial aspect of app development. It is relevant both for apps, but also software and websites. There are countless reasons to check for mobile browser agents.

Most importantly, the ability to render a unique user experience.

The UAParser.js library alone gets millions of weekly package downloads. And, in most cases, it is enough if you’re building something from scratch.

Sometimes you might just want a simple solution that does the job without any libraries.

How to detect tablet device in javascript

Let me know if I missed any!

navigator.userAgent

The holy grail of browser detection is the navigator.UserAgent property.

This is, of course, a very primitive way of doing it. It can easily be manipulated as the User-Agent property can be spoofed.

But, you can still use it in various projects because it does the job. E.g. Landing pages or making a custom redirect to a mobile version.

How to display a warning message if the user uses an unsupported or outdated browser?

One way this property can be used is to check whether o

how to detect browser in javascript

detectmobilebrowsers.com how to use javascript