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Wednesday, January 10, 2024

Get Browser Kind and Model in JavaScript


On this Byte, we’ll see tips on how to detect a person’s browser sort and model utilizing JavaScript. This would possibly appear to be it ought to be a trivial job, however that is not all the time the case. It may be fairly useful when creating responsive and user-friendly net functions. We’ll be wanting into why it is necessary to determine a browser’s sort and model, after which we’ll delve into the strategies to get the browser sort and model.

Why Detect Browser Title and Model?

The reply lies within the various help for various net applied sciences throughout totally different browsers and their variations. For example, sure options of HTML5, CSS3, or JavaScript will not be supported or would possibly behave in another way in several browsers. By detecting the browser title and model, builders can present different options or warn customers about potential compatibility points.

Or perhaps you need to present a hyperlink to a person for a browser extension. How will you recognize which extension supplier to hyperlink to? Firefox Add-ons, or the Chrome Internet Retailer?

Getting Browser Title and Model in JavaScript

There are a pair other ways to get the browser title and model in JavaScript. We’ll be taking a look at two strategies. The primary technique includes using the navigator.userAgent property, and the second technique makes use of a 3rd occasion library to do the give you the results you want.

Methodology 1: Utilizing Navigator.userAgent Property

The navigator.userAgent property in JavaScript returns a string that represents the browser’s user-agent header. This string accommodates details about the browser’s title, model, and different particulars.

This is an instance of how you should utilize this property to detect the browser title and model:

var userAgent = navigator.userAgent; 


When you run this code in your browser’s console, it’s going to print out a string that appears one thing like this:

"Mozilla/5.0 (Home windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3"

This string tells us that the browser is Chrome and its model is 58.0.3029.110. Nevertheless, parsing this string to get the precise browser title and model generally is a bit tough as a result of various codecs of user-agent strings throughout totally different browsers. Normally, builders use common expressions to parse this string and extract the required info.

Notice: Whereas the navigator.userAgent property gives a fast and straightforward solution to detect the browser title and model, it isn’t all the time dependable. Some browsers permit customers to vary the user-agent string, which might result in incorrect detection.

Methodology 2: Utilizing Browser Detection Libraries

In some instances, parsing the navigator.userAgent string can turn out to be fairly advanced, particularly when you’ll want to detect a variety of browser varieties and variations. That is the place browser detection libraries could be a variety of assist. They do the heavy lifting for you, making it simpler to determine the browser, its model, OS, and extra. One fashionable library is ua-parser-js.

Let’s examine how we are able to use this library to get the browser title and model:

// Import the ua-parser-js library
var UAParser = require('ua-parser-js');

// Create a brand new parser occasion
var parser = new UAParser();

// Get the browser title and model
var consequence = parser.getResult();
console.log(consequence.browser); // Outputs: { title: "Chrome", model: "89.0.4389.82" }

On this code, we first import the ua-parser-js library. We then create a brand new parser occasion and name the getResult() technique to get the browser info. The output is an object containing the browser title and model.

There are different libraries that carry out browser detection by checking which options are current, which generally is a good different if you happen to suspect the UA has been modified, however that is additionally a troublesome technique since browser options are continually altering.

Potential Points with Browser Detection

Whereas browser detection generally is a great tool, it isn’t with out its potential pitfalls. One of many major points, as we have talked about, is that the navigator.userAgent string could be simply spoofed or altered. Which means that relying solely on this string for browser detection might result in inaccurate outcomes.

One other concern is that browser detection can result in code complexity. If it’s important to write totally different code for various browsers, your code base can shortly turn out to be cluttered and more durable to take care of. That is why function detection is usually advisable over browser detection, relying in your use-case.

Use Circumstances for Browser Detection

Regardless of its potential points, there are fairly a couple of legitimate use instances for browser detection. Let’s discover a few of them.

Internet Optimization

One of the vital widespread use instances for browser detection is net optimization. By realizing the kind and model of the person’s browser, you possibly can customise your web site to offer the very best expertise for that browser.

For instance, you would possibly use browser detection to serve totally different variations of your web site’s CSS or JavaScript information. If the person is on an older browser that does not help sure options, you possibly can serve an easier, extra appropriate model of your website.

// Instance: Serving totally different JavaScript information primarily based on the browser
if (consequence.browser.title === "IE" && consequence.browser.model < "9.0") {
    // Serve an easier model of the JavaScript file for older IE browsers
} else {
    // Serve the common JavaScript file for different browsers

On this instance, we’re utilizing the ua-parser-js library to detect if the person is on an older model of Web Explorer. If they’re, we serve an easier model of the JavaScript file. In the event that they’re on a special browser, we serve the common JavaScript file.

Keep in mind, whereas browser detection generally is a great tool for net optimization, it isn’t a silver bullet. All the time think about the potential points and use it judiciously.

Consumer Expertise Enhancement

On this planet of net improvement, person expertise (UX) is king. It is all about making a easy, intuitive, and satisfying expertise on your customers, proper? That is the place browser detection can come into play.

We could say you’ve got developed a function that leverages the newest Internet APIs. Nevertheless, these APIs aren’t supported by all browsers. As an alternative of leaving your customers with older browsers in the dead of night (and probably pissed off), you should utilize browser detection to offer them another, however nonetheless nice, expertise.

This is an instance. Suppose you’ve got applied a function utilizing the Internet Speech API, which isn’t supported in Web Explorer.

if (window.hasOwnProperty('SpeechRecognition') || window.hasOwnProperty('webkitSpeechRecognition')) {
    // Use the Internet Speech API
} else {
    // Present different technique

On this code, if the person’s browser helps the Internet Speech API, we go forward and use it. If not, we offer another technique that is appropriate with their browser. This manner, no person is left behind and everybody will get to take pleasure in your website, whatever the browser they’re utilizing.

Notice: All the time bear in mind to check your website totally on numerous browsers after implementing browser detection. This can be sure that your customers get the very best expertise, no matter their browser sort and model.


On this Byte, we have explored tips on how to detect a person’s browser sort and model in JavaScript. We have seen how we are able to use the navigator.userAgent property, in addition to browser detection libraries, to realize this. We have additionally mentioned potential points with browser detection and highlighted a few of its use instances, significantly in enhancing person expertise.

Whereas browser detection generally is a great tool, it isn’t all the time the most effective answer. Each time attainable, use function detection to see if the browser helps no matter function you are wanting to make use of. Nevertheless, in instances the place browser-specific quirks or bugs come into play, or when coping with unsupported options, browser detection generally is a lifesaver.

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