What is browser sniffing in Javascript?

Why is browser sniffing bad?

From the article: Browser sniffing is a technique in which you make assumptions about how a piece of code will work in the future. Generally this means making an assumption that a specific browser bug will always be there – which frequently leads to code breaking when browsers make changes and fix bugs.

What is browser detection in JavaScript?

Browser Detection with JavaScript. … JavaScript has a standard object called navigator that contains data about the browser being used. The navigator object has a lot of properties, but the . userAgent property — a string that contains data about the browser, operating system, and more– is all we’ll need.

What is sniffing agent?

User-Agent (UA) Sniffing

UA Sniffing usually involves searching for a specific string or pattern in the UA string and basing choices on the result of that search. A popular example from real life is: … UA Sniffing may seem like the solution to many problems, but, like most quick solutions, it has hidden long-term costs.

What is the purpose of a browser sniffer?

Browser sniffing (also known as browser detection) is a set of techniques used in websites and web applications in order to determine the web browser a visitor is using, and to serve browser-appropriate content to the visitor. It is also used to detect mobile browsers and send them mobile-optimized websites.

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How do I find my browser name?

Answer: To establish the actual name of the user’s Web browser, you can use the navigator. appName and navigator. userAgent properties. The userAgent property is more reliable than appName because, for example, Firefox or Opera may return the string “Netscape” as the value of navigator.

How do I know if I have IE11?

Use !( window. ActiveXObject) && “ActiveXObject” in window to detect IE11 explicitly. To detect any IE (pre-Edge, “Trident”) version, use “ActiveXObject” in window instead.

What are the types of sniffing attacks?

There are two types of sniffing – active and passive.

  • Active sniffing involves injecting address resolution protocols (ARPs) into a network to flood the switch content address memory (CAM) table. …
  • Active sniffing techniques include spoofing attacks, DHCP attacks, and DNS poisoning among others.

Does VPN prevent packet sniffing?

One effective way to protect yourself from packet sniffers is to tunnel your connectivity a virtual private network, or a VPN. A VPN encrypts the traffic being sent between your computer and the destination. … A packet sniffer would only see encrypted data being sent to your VPN service provider.

How do you detect network sniffing?

Any interface running in promiscuous mode is “listening” to all network traffic, a key indicator that a network sniffer is being used. To check your interfaces using ifconfig, just type ifconfig -a and look for the string PROMISC.