Detect if is mobile with Javascript, read user agent

How to detect if your user is using a mobile device in Javascript? You can do it by checking the…

November 5, 2013

How to detect if your user is using a mobile device in Javascript? You can do it by checking the user agent, that is the “signature” of the browser. When a browser request a page it introduces himself by telling which browser is. This signature is accessible by php on the server, but also by Javascript on the client.

Read User Agent in Javascript:

function isMobile () {
   if( navigator.userAgent.match(/iphone/i) ||
   navigator.userAgent.match(/ipad/i) ||
   navigator.userAgent.match(/android/i) ||
   navigator.userAgent.match(/blackberry/i) ||
   ) {
      return true;
   return false;

This code search the user agent string for matching for keyword “ipad”, “iphone”, “blackberry” and “android”. If there is an occurence return true, else return false;


I'm a software engineer, an everyday web developer and a maker. I usually build sites with PHP, within or without WordPress. I build Internet of Things with Arduino and ESP8266. I'm the founder of and and I'm actually the Chief Technical Officer of Better Days web agency.


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