What Does Your User Agent Say About You?


A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

The user agent string can be accessed with JavaScript on the client side using the navigator.userAgent property.

A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".


User Agent String

Browser Data

Change Browser User Agent Javascript

Brent Mccoy
• Tuesday, 05 July, 2022
• 9 min read

It’s all great if we just fetch HTML and parse it with cheerio. Now, we need to scrape a website with JS enabled, because website is doing black magic client side rendering.

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October 27, 2018, Most of the users don’t know what is user agent of a browser. So, There are a very few users who actually want to change their web browser ’s user agent.

But, In short, An user agent is a software that provides information to a website about your browser, operating system, device etc. It helps a website to deliver compatible and relevant contents to its visitors.

Some websites deliver different contents for different operating systems, browsers and devices. In that case, You may feel necessity to change web browser ’s user agent or operating system id to windows.

There are plenty of extensions or add-ons for all popular browsers to change its operating system, device and other information. You can simply install it in your browser (Chrome of Firefox) and then start using it.

After installing them, You should see a new icon in top right corner of browser. Click on that user agent extension icon and choose your preferences from browser versions, operating systems and device types etc.

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You will see the different version of web pages according to the user agent you have selected In fact, Extensions and add-ons are the easiest way to changeuseragent.

ChangeUserAgent in Chrome without Extensions: First, Visit a webpage. Alternatively, You can right-click on blank area of webpage and choose To inspect.

You will find them by clicking on Edit from the device list of drop-down. Just, Right clicks on blank space and choose New > String.

A full list of user agents can be found here: You can set value according to your preference. If you want to get back the default user agent, Just right click on general.user agent.override preference and choose reset.

You can easily change, browser type, device, operating system information from there. You can change any web browser ’s user agent using third-party extensions or manually.

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The Navigator ID.sergeant read-only property returns the user agent string for the current browser. Also keep in mind that users of a browser can change the value of this field if they want (UA spoofing).

Some Firefox extensions do that; however, this only changes the HTTP header that gets sent, and doesn't affect browser detection performed by JavaScript code. Opera 6+ allows users to set the browser identification string via a menu.

A Hamstring 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.

If you ever wanted to make your web traffic seem like it was coming from a different browser –say, to trick a site that claims it’s incompatible with yours–you can. This allows you to request web pages intended for different browsers–or even different devices, like smartphones and tablets.

Click the menu button to the right of the “Console” tab at the bottom of the Developer Tools pane and select “Network Conditions” If you don’t see the console at the bottom, click the menu button in the top right corner of the Developer Tools pane–that’s the button just to the left of the “x”–and select “Show Console”.

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On the Network conditions tab, uncheck “Select automatically” next to User agent. It only works while you have the Developer Tools pane open, and it only applies to the current tab.

To create the preference, right-click on the about:config page, point to New, and select String. You can find extensive lists of user agents on various websites, such as this one.

This setting applies to every open tab and persists until you change it, even if you close and reopen Firefox. To revert Firefox to the default user agent, right-click the “general.user agent.override” preference and select Reset.

Microsoft Edge and Internet Explorer have user agent switchers in their developer tools, and they’re nearly identical. To open them, click the settings menu and select “F12 Developer Tools” or just press F12 on your keyboard.

The developer tools will open in a separate pane at the bottom of the window. It only applies to the current tab, and only while the F12 Developer Tools pane is open.

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Platform identifiers change based on the operating system being used, and version numbers also increment as time passes. Mapping UA string tokens to a more human-readable browser name for use in code is a common pattern on the web today.

When mapping the new Edge token to a browser name, Microsoft recommends using a different name than the one developer used for the legacy version of Microsoft Edge to avoid accidentally applying any legacy workarounds that are not applicable to Chromium-based browsers. When Microsoft is notified about these types of issues, website owners are contacted and informed about the updated UA.

Reload to refresh your session. You signed out in another tab or window. The new Microsoft Edge running on Chromium isn’t yet here officially, but a leaked build allows us to try out the browser in anticipation of its highly-anticipated release.

Using the browser on a daily basis isn’t obviously recommended as experimental builds like this can’t by any means become your main driver. For many users, switching to a different user agent and thus emulating another browser is a method to bypass certain website restrictions that concern a specific app.

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For example, if a website doesn’t support Chromium, you can very well change the user agent to mimic a different browser like Mozilla Firefox. The best example is Skype for Web, which doesn’t work in Firefox anymore, so Mozilla users need to switch to another user agent to connect to the service.

For those unfamiliar with this screen, it’s specifically supposed to provide developers with advanced tools that let them analyze code and website performance. Changing the user agent is actually considered a developer option that helps webmasters check their pages against potential compatibility issues with different browsers.

I have the need to change the user agent information that Cordova uses. If there was the possibility to change the user agent, then I wouldn't get the confirmation box.

Code doesn't break, but after check the value of sergeant it is still the original value. If anyone knows a different way to get rid of the confirmation box from the source of that page before it is shown, then that would be fine too.

Hi Jan-Dirk, To change the user agent you can use this (replace sample string with yours): Kind regards, Jordan the Clerk team Share feedback and vote for features on our Feedback Portal.

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I used this code to remove the confirmation: text = text.replace('function switchtomobile()', 'function dontswitch2mobile()'); // rename the function so code doesn't break on next command text = text.replace('switchtomobile()', ''); // remove the call to the function Hi Jan-Dirk, You can solve the first problem by adding this to top of the page source.

Hello Jordan, you suggestion to use base target have solved a big part of the issue. My only issue is that consecutive pages still give the alert() and I don't think I can avoid that.

On each product page of the site I include in my app, there is an 'add to cart' button which does a form post that is never fired. I think I have to find a different way of displaying products in my app.

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