uainfer
This is a simple JavaScript library (MIT License) to infer the user agent from its claimed User-Agent string. The objective of uainfer to provide a human-friendly answer to the inquiry "What browser am I using?".
In the context of a web browser, the most common way to obtain the User-Agent string is from the value of navigator.userAgent
. In the context of an HTTP server, it can be retrieved from the User-Agent
header field in the HTTP request.
Example usage with Node.js REPL (or ):
> uainfer = ;> ua = uainfer
(To use this library in a front-end application, see this JSFiddle demo)
For browsers utilizing Chrome/Blink engine (Samsung Browser, Opera, Vivaldi, etc), the result can contain the corresponding equivalent version of Chrome:
> consoleUserAgent browser: name: 'Vivaldi' version: 196 fullVersion: '1.96.1147.52' chromeFamily: version: 65 fullVersion: '65.0.3325.183' os: name: 'Windows' version: '10'
Non-goals:
- Recognize every single web browsers and obscure user agents out there.
- Deduce other information such as CPU type, device, form factor, etc.
Design choices:
- For a better maintenance, avoid regular expressions.
- Always expand its small but fairly extensive test suite.
- Keep it tidy and lightweight (4 KB when minified).
This library is created and maintained by @AriyaHidayat.