User agent device javascript

How to detect a mobile device with JavaScript?

In this tutorial, we are going to learn how can we detect a mobile device over which we are working using JavaScript.

Approach 1: Using the navigator.userAgent Property

To detect a mobile device with JavaScript we are going to use the window navigator object which contains all the information regarding a browser. The property which we will use to detect a mobile device will be the userAgent property which is used to return the user-agent header sent to the server by the browser. The value we receive from this property is the browser name, version, and platform i.e., all the information regarding a mobile device you will get using this function.

Syntax

Syntax to detect a mobile device with JavaScript is given as −

window.navigator.userAgent ; or navigator.userAgent ;

Steps

Steps to detect a mobile device using JavaScript are given below −

• Create a button and link it with a function named as myfunction.
• Now in the function we will create one if loop.
• Inside the if loop we will write some conditions using navigator.userAgent property to detect any mobile device.
• The conditions we write will find match for each type of mobile devices such as android, webOS, iPad, iPhone, iPod, BlackBerry, and windows Phone.
• After checking all the conditions, it will return true if any mobile device found.
• If any mobile device is not found than we get false in the “a” variable using else loop.
• At last print the value of a in the answer variable which is linked with the paragraph tag with id result to print the value either true or false on the screen

Example

We can use the below HTML code to detect mobile device with JavaScript −

    Check    

Note − To get the output from the above code as ‘true’ you need to run your code using the chrome developer tool by choosing the option of mobile phones. When you enter the mobile zone of the developer tool there you can choose any mobile phone to work as an emulator from the list of mobile devices present there to detect the presence of mobile phones using the above code.

On running the code, a button will appear on the window named Check by clicking you can detect the mobile phone. If the code is running on any mobile device, then the output will be true otherwise it will be false.

Approach 2

But this method of user-agent is not the best method to detect a mobile device with JavaScript because the user-agent strings can be spoofed very easily. So, we can also use the window.orientation method to detect a mobile device using JavaScript, this method checks for the orientation of the viewport of the device. It provides us certain values in degrees like -90, 0,90,180 all these values signify different viewports. If the value of the viewport is greater than 0 it means that the device is a mobile otherwise it’s not a mobile phone.

Note − This feature is deprecated and no longer recommended

Steps to detect a mobile device using JavaScript are given below −

• Create a button and link it with a function named ‘myfunction’.
• Now inside the script tag, we will define the function.
• Create a variable named as answer and inside it we will use the window.orientation method to check if the orientation value is greater than -1 or not.
• In the next line, we will call the alert method which will print the value as “It is a mobile phone” if the value of the answer variable is true.
• Otherwise, the value will be shown as “It is not a mobile phone”.

Example

We can use the below HTML code to detect mobile device with JavaScript −

   Check    

Note − To check the output of this code we need to use the chrome developer tool as used in the above code.

If the code runs on an emulator mobile then we get the alert as “It is a mobile phone” else, we will get the output as “It is not a mobile phone”.

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How To Detect Mobile Device, OS using JavaScript

Hello Devs, In this blog, we are going to learn that how you can detect mobile device or browser or OS using JavaScript and you can redirect the user to the mobile application or to the web application automatically.

Table of content

So without wasting any time, lets get into the tutorial.

1.What is navigator object in JavaScript

To get the bowser details or device details, JavaScript stores these information in the navigator property of window object.
navigator object contains lots of information about the browser, some of the most used/ important information we will see later in this tutorial.

Lets first see what navigator object is.
if you directly want to see how to get the detect mobile and desktop then you can skip this part can click here

navigator object contains information about the browser.
(NOTE: Not all but all major browser support this object)

2.Some of the most important properties are,

1. Clipboard — used to copy something to clipboard and paste it any where (Ex. while making Click to copy)
2. connection
3. language — shows the language of browser.
4. geolocation — Returns a Geolocation object that can be used to locate the user’s position
5. onLine — check whether the browser is online
6. platform — machine type where browser is installed.
7. cookieEnabled — it returns a Boolean value that indicates whether cookies are enabled or not.
8. serviceWorker — mainly used to checks if the browser supports service workers
9. vibrate(time) — make device vibrate if it support that
10. userAgent — will see below
11. userAgentData — will see below

I think this much information about the navigator object is enough to understand what is navigator object and what all information it contains

3.How to detect mobile device or browser or OS.

To get these information we will use the property userAgent , userAgentData of navigator object.

navigator.userAgent
userAgent will give you the information of lot of things like device name, browser name, OS version but the information returned by browser is not much understandable.
So, we can understand these returned information from the hack.

to get OS version and name you can follow the below hack,

if (window.navigator.userAgent.indexOf("Windows NT 10.0")!= -1) console.log("OS is Windows 10");> if (window.navigator.userAgent.indexOf("Windows NT 6.3") != -1) console.log("OS is Windows 8.1");> if (window.navigator.userAgent.indexOf("Windows NT 6.2") != -1) console.log("OS is Windows 8");> if (window.navigator.userAgent.indexOf("Windows NT 6.1") != -1) console.log("OS is Windows 7");> if (window.navigator.userAgent.indexOf("Windows NT 6.0") != -1) console.log("OS is Windows Vista");> if (window.navigator.userAgent.indexOf("Windows NT 5.1") != -1) console.log("OS is Windows XP");> if (window.navigator.userAgent.indexOf("Windows NT 5.0") != -1) console.log("OS is Windows 2000");> if (window.navigator.userAgent.indexOf("Mac") != -1) console.log("OS is Mac/iOS");> if (window.navigator.userAgent.indexOf("X11") != -1) console.log("OS is UNIX");> if (window.navigator.userAgent.indexOf("Linux")!= -1) console.log("OS is Linux");> 

to check mobile device info you can follow below hack,

 function detectMobile()  const toMatch = [ /Android/i, /webOS/i, /iPhone/i, /iPad/i, /iPod/i, /BlackBerry/i, /Windows Phone/i ]; return toMatch.some((toMatchItem) =>  return navigator.userAgent.match(toMatchItem); >); > 

userAgent is much more complex to get these details.
So we have one more property i.e.
navigator.userAgentData
This gives the information about browser and mobile detection in 1 line.

navigator.userAgentData.mobile; //returns true or false, depending on the condition 

NOTE: Both of these 2 ways are not recommended to be use in the production.

So lets now see the best way to do so,

4.Better way is,

using matchMedia
it gives you more flexibility to decide that after what screen size you want to deal it as mobile or desktop and lot of other info,
please check official doc from MDN, MDN — Media Query
MDN- Media Query Features
About Pointer

function DetectDevice()  let isMobile = window.matchMedia || window.msMatchMedia; if(isMobile)  let match_mobile = isMobile("(pointer:coarse)"); return match_mobile.matches; > return false; > DetectDevice() //return true if mobile, and return false if desktop 

matchMedia also gives you the right to let you choose that after what screen-size you want to treat the device as Mobile(same as CSS Media Query) and its much more flexible than navigator object.

if (window.matchMedia("only screen and (max-width: 760px)"))  //do something you want to for the screen size less than 760 > 

we can also use window and screen object achieve this, but these are the older way and much complicated in bigger applications.

if(window.innerWidth > 768)//do something> if(screen.width > 768)//do something> 

Thank you for reading this far. This is a brief introduction on How to Detect Mobile Screen & OS using JavaScript .
If you find this article useful, like and share this article. Someone could find it useful too.

If you find anything technically inaccurate please feel free to comment below.

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Navigator: userAgent property

The Navigator.userAgent read-only property returns the user agent string for the current browser.

Note: The specification asks browsers to provide as little information via this field as possible. Never assume that the value of this property will stay the same in future versions of the same browser. Try not to use it at all, or only for current and past versions of a browser. New browsers may start using the same UA, or part of it, as an older browser: you really have no guarantee that the browser agent is indeed the one advertised by this property.

Also keep in mind that users of a browser can change the value of this field if they want (UA spoofing).

Browser identification based on detecting the user agent string is unreliable and is not recommended, as the user agent string is user configurable. For example:

• In Firefox, you can change the preference general.useragent.override in about:config . Some Firefox extensions do that; however, this only changes the HTTP header that gets sent and that is returned by navigator.userAgent . There might be other methods that utilize JavaScript code to identify the browser.
• Opera 6+ allows users to set the browser identification string via a menu.

Value

A string specifying the complete user agent string the browser provides both in HTTP headers and in response to this and other related methods on the Navigator object.

The user agent string is built on a formal structure which can be decomposed into several pieces of info. Each of these pieces of info comes from other navigator properties which are also settable by the user. Gecko-based browsers comply with the following general structure:

userAgent = appCodeName/appVersion number (Platform; Security; OS-or-CPU; Localization; rv: revision-version-number) product/productSub Application-Name Application-Name-version

Examples

alert(window.navigator.userAgent); // alerts "Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.2) Gecko/20010725 Netscape6/6.1" 

Specifications

Browser compatibility

BCD tables only load in the browser

See also

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This page was last modified on Apr 7, 2023 by MDN contributors.

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