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 ):

``js
> uainfer = require('uainfer');
> ua = uainfer.analyze('Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)'
> ua.toString()
'Internet Explorer 7 on Windows XP'
`

(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:

`js
> console.log(ua)
UserAgent {
browser:
{ name: 'Vivaldi',
version: 1.96,
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.