Javascript useragent browser version

Getting a browser’s name client-side

Is there any object or method that returns data about the browser, client-side? For example, I need to detect if the browser is IE (Interner Explorer). Following is the code snippet.

function isInternetExplorer() < if(navigator.appName.indexOf("Microsoft Internet Explorer") != -1) < return true; >return false; > 

13 Answers 13

JavaScript side — you can get browser name like these ways.

if(window.navigator.appName == "") OR if(window.navigator.userAgent == "") 

The problem with using this is that Netscape will be returned when executed in Firefox. I think a more reliable method is window.navigator.userAgent .

You seem to have deleted your reply from my thread so I’ll post it here. Feel free to remove it when you’ve read it.

I, the OP, didn’t downvote neither. But I can think of two reasons why it got downvoted. First being that the parameter isn’t wrongly put (you jumped to conclusions without checking if the issue is a bit more convoluted). Second being that it actually didn’t answer the question. The value inserted will be null or create an error. Having said that, I’ll upvote you so you don’t loose so much rep. But your reply doesn’t get to the level of upvote, really. I’ll still do that because -2 is too harsh. In the future, though, you might ask yourself — is it really that simple?. Usually it isn’t.

Thanks @KonradViltersten to message me here. I’ve accepted my mistake and deleted my answer too. It was my mistake. was in hurry to get reputation but lost 4 points 😀 — BTW good question.

Yeah, it’s a nuisance to get downvote. I prefer to leave a comment. I can give you a wild upvote, since you seem to understand the mistake. No point punishing the wiser ones.

This is pure JavaScript solution. Which I was required.
I tried on different browsers. It is working fine. Hope it helps.

You can use the navigator.appName and navigator.userAgent properties. The userAgent property is more reliable than appName because, for example, Firefox (and some other browsers) may return the string «Netscape» as the value of navigator.appName for compatibility with Netscape Navigator.

Note, however, that navigator.userAgent may be spoofed, too – that is, clients may substitute virtually any string for their userAgent . Therefore, whatever we deduce from either appName or userAgent should be taken with a grain of salt.

var nVer = navigator.appVersion; var nAgt = navigator.userAgent; var browserName = navigator.appName; var fullVersion = ''+parseFloat(navigator.appVersion); var majorVersion = parseInt(navigator.appVersion,10); var nameOffset,verOffset,ix; // In Opera, the true version is after "Opera" or after "Version" if ((verOffset=nAgt.indexOf("Opera"))!=-1) < browserName = "Opera"; fullVersion = nAgt.substring(verOffset+6); if ((verOffset=nAgt.indexOf("Version"))!=-1) fullVersion = nAgt.substring(verOffset+8); >// In MSIE, the true version is after "MSIE" in userAgent else if ((verOffset=nAgt.indexOf("MSIE"))!=-1) < browserName = "Microsoft Internet Explorer"; fullVersion = nAgt.substring(verOffset+5); >// In Chrome, the true version is after "Chrome" else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) < browserName = "Chrome"; fullVersion = nAgt.substring(verOffset+7); >// In Safari, the true version is after "Safari" or after "Version" else if ((verOffset=nAgt.indexOf("Safari"))!=-1) < browserName = "Safari"; fullVersion = nAgt.substring(verOffset+7); if ((verOffset=nAgt.indexOf("Version"))!=-1) fullVersion = nAgt.substring(verOffset+8); >// In Firefox, the true version is after "Firefox" else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) < browserName = "Firefox"; fullVersion = nAgt.substring(verOffset+8); >// In most other browsers, "name/version" is at the end of userAgent else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) < (verOffset=nAgt.lastIndexOf('/')) ) < browserName = nAgt.substring(nameOffset,verOffset); fullVersion = nAgt.substring(verOffset+1); if (browserName.toLowerCase()==browserName.toUpperCase()) < browserName = navigator.appName; >> // trim the fullVersion string at semicolon/space if present if ((ix=fullVersion.indexOf(";"))!=-1) fullVersion=fullVersion.substring(0,ix); if ((ix=fullVersion.indexOf(" "))!=-1) fullVersion=fullVersion.substring(0,ix); majorVersion = parseInt(''+fullVersion,10); if (isNaN(majorVersion)) < fullVersion = ''+parseFloat(navigator.appVersion); majorVersion = parseInt(navigator.appVersion,10); >document.write('' +'Browser name = '+browserName+'
' +'Full version = '+fullVersion+'
' +'Major version = '+majorVersion+'
' +'navigator.appName = '+navigator.appName+'
' +'navigator.userAgent = '+navigator.userAgent+'
'); 

Источник

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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Detect Browser Version in JavaScript

1. Use the userAgent to Detect Browser Version in JavaScript
2. Why Browser Version Detection Should Be Avoided in JavaScript
3. Another Option to Detect Browser Version in JavaScript

There are many devices in today’s world with various screen sizes.

But the problem is that not all the devices can support various features implemented on the website.

To detect the browser version and browser name, we can use the userAgent in JavaScript.

Use the userAgent to Detect Browser Version in JavaScript

The navigator is the property of the window object.

To access the userAgent , you can use navigator.userAgent or use object destructuring to get the userAgent from the navigator.

const < userAgent >= navigator console.log(userAgent); 

Using the includes method will take a string as a parameter to return it. This string helps in detecting the browser as follows.

if (userAgent.includes('Firefox/'))   console.log(userAgent) > else if (userAgent.includes('Edg/'))   console.log(userAgent) > else if (userAgent.includes('Chrome/'))   console.log(userAgent) > else if (userAgent.includes('Safari/'))   // Safari  > 

//Mozilla Firefox Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:98.0) Gecko/20100101 Firefox/98.0  //Microsoft Edge Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.80 Safari/537.36 Edg/98.0.1108.50  // Google Chrome Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36 

The browser version and its name are present at the end of the string provided by the userAgent .

You can run the code below if you want to get the end part, i.e., the browser version and name and not the entire string.

if (userAgent.includes('Firefox/'))   console.log(`Firefox v$userAgent.split('Firefox/')[1]>`) > else if (userAgent.includes('Edg/'))   console.log(`Edg v$userAgent.split('Edg/')[1]>`) > else if (userAgent.includes('Chrome/'))   console.log(`Chrome v$userAgent.split('Chrome/')[1]>`) > else if (userAgent.includes('Safari/'))   // Safari  > 

//Mozilla Firefox Firefox v98.0  //Microsoft Edge Edg v98.0.1108.50  // Google Chrome Chrome v98.0.4758.102 Safari/537.36 

All browser displays the same output. It is because all are built on chromium.

Why Browser Version Detection Should Be Avoided in JavaScript

It’s not a good idea to detect the browser name and its version using userAgent because it’s not 100% accurate.

Every browser sets this data differently, and all browsers do not follow a particular standard.

Another Option to Detect Browser Version in JavaScript

Feature detection in a browser-

It can be a better idea to detect whether a particular browser supports a particular feature or not. And based on whether it supports a feature or not, you can take further action and write your code accordingly.

Progressively developing a website-

Following a design technique, you develop a website for smaller devices first with fewer features and move your way up to the top while increasing the features. It is known as a bottom-up approach.

Building for modern browsers-

Develop a full-fledged website with all the features for modern browsers and then tweak some changes so that it is supported on older browsers. It can be difficult to implement and less effective than the progressive or bottom-up approach.

Sahil is a full-stack developer who loves to build software. He likes to share his knowledge by writing technical articles and helping clients by working with them as freelance software engineer and technical writer on Upwork.

Related Article — JavaScript Browser

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Как определить версию браузера пользователя с помощью JavaScript

Узнайте, как определить версию браузера пользователя с помощью JavaScript для адаптации веб-приложений и предупреждения об устаревших версиях.

Определение версии браузера пользователя может быть полезно во многих случаях, например, при необходимости адаптации веб-приложения под конкретную версию браузера или предупреждении пользователя об устаревшей версии. В этой статье мы рассмотрим, как определить версию браузера пользователя с помощью JavaScript.

Использование navigator.userAgent

Один из способов определить версию браузера — это использовать свойство navigator.userAgent . Это свойство возвращает строку, содержащую информацию о браузере, такую как название и версия.

Пример кода для определения версии браузера с помощью navigator.userAgent :

function getBrowserVersion() < const userAgent = navigator.userAgent; const browserName = userAgent.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || []; if (/trident/i.test(browserName[0])) < const rv = /\brv[ :]+(\d+)/g.exec(userAgent) || []; return `IE $`; > const version = browserName[2] ? browserName[2] : null; const browser = browserName[1] ? browserName[1] : null; if (browser === null || version === null) < return 'Unknown Browser'; >return `$ $`; > console.log(getBrowserVersion()); // Выведет название и версию браузера

Использование navigator.appName и navigator.appVersion

Еще один способ определить версию браузера — использовать свойства navigator.appName и navigator.appVersion . Однако стоит отметить, что данные свойства могут быть менее надежными, чем navigator.userAgent .

Пример кода для определения версии браузера с помощью navigator.appName и navigator.appVersion :

function getBrowserVersion() < const appName = navigator.appName; const appVersion = navigator.appVersion; let browserName = ''; let version = ''; if (appName === 'Microsoft Internet Explorer') < browserName = 'IE'; version = appVersion.slice(appVersion.indexOf('MSIE') + 5, appVersion.indexOf(';', appVersion.indexOf('MSIE'))); >else if (appName === 'Netscape') < browserName = 'Netscape'; version = appVersion.slice(appVersion.indexOf(' rv:') + 4, appVersion.indexOf(')')); >else < return 'Unknown Browser'; >return `$ $`; > console.log(getBrowserVersion()); // Выведет название и версию браузера

😉 Итак, теперь вы знаете, как определить версию браузера пользователя с помощью JavaScript. Удачи в разработке!

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