Navigator.appVersion

The Navigator.appVersion read-only property of the Navigator interface returns a string representing version information about the browser.

The appVersion property returns information indicating the browser version.

Note that the information returned varies significantly by browser. In some browsers, such as Chrome, this is nearly the same as the value returned by Navigator.userAgent, with the Mozilla/ prefix removed. For example:

In other browsers, such as Firefox, this is cut down to a short string that hints at the platform/OS. For example:

Theoretically this information is useful for detecting the browser and serving code to work around browser-specific bugs or lack of feature support. However, this is unreliable and is not recommended for the reasons given in User-Agent reduction and Browser detection using the user agent.