Browser, os and device detection
JavaScript HTML
Latest commit 97b47bc Feb 9, 2016 1 @antivanov Fixes #3 "Opera in iOS"
Opera on iOS devices is now properly recognized.


Sniffr Build Status

Browser, OS and device detection based on the available user agent string.

it's very rarely a good idea to use user agent sniffing. You can almost always find a better, more broadly compatible way to solve your problem! MDN: Browser detection using the user agent

Why use it

In case some browser-specific issue cannot be fixed uniformly across the browsers we may need to perform (sad gasp) some browser detection. For example, browser X crashes when function Y from library Z is used, so we have to detect when we are dealing with browser X and disable library Z.

Another legitimate case is when we want to know what browsers, os and devices are most frequently used when our site is accessed. Then we can just analyze the user agent string sent in HTTP request headers on a server side. As a minor variation, alternatively, we can perform the user agent string analysis on the client side and send to the server only the results.

What is recognized


  • Firefox
  • Internet Explorer
  • Edge
  • Chrome
  • Opera
  • Safari
  • Android Browser
  • BlackBerry Browser
  • Opera mini

Operating Systems

  • Windows
  • Linux
  • Mac OS
  • iOS
  • Blackberry OS
  • OpenBSD
  • Android
  • Firefox OS
  • Windows Phone
  • Windows Mobile


  • iPad
  • iPhone
  • Galaxy
  • HTC
  • Nexus
  • Nokia
  • Lumia
  • Blackberry
  • XBox


To install the library use Bower:

bower install sniffr

Ready to use library is available in the dist folder.

How to use

The library is meant to be used only in a browser, no server-side code is run. Include the library:

<script src="bower_components/dist/sniffr.min.js" />

after the script has loaded the object Sniffr is available and can be used in the client code.


//If Windows and Firefox 28 or later
if ( === "windows"
  && === "firefox" && Sniffr.browser.version[0] >= 28) {
  //Apply some workaround


//Sending user browser and os information to the server for further analysis
Stats.send(Sniffr.os, Sniffr.browser, Sniffr.device);


Sniffr.os: operating system

Sniffr.browser: browser

Sniffr.device: device

Sniffr.sniff : function that expects a user agent string as an argument, it is called automatically in a browser

Server side

Sniffr can also be used in a Node.js environment in case you need to do some server-side user agent analysis as well.

First install it

npm install sniffr

Then load the module, provide it the agent string and query the results just like in a browser environment:

var Sniffr = require("sniffr");
var s = new Sniffr();

s.sniff("Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5355d Safari/8536.25");

console.log("Operating System:");

Other libraries

Some libraries like jQuery provide only browser information and not the OS information. Some like Detectizr are plugins for other libraries that you may not use. And some require server-side code. A few libraries are usable only on the server side or only in a browser.

Sniffr provides simple and symmetric API, does not depend on other libraries, does not require the server part, is tiny, fast and easily extensible. In addition, it can be used either in a browser environment and on the server side.


The original sniffing dog image location is