User agent sniffing
The Navigator.userAgent read-only property of the Navigator interface returns the User-Agent (UA) string for the current browser.
Browser support
| Feature | Desktop | Mobile | ||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Safari | Chrome Android | Safari iOS | |
| 1 | 12 | 1 | 1 | 18 | 1 | |
| The WorkerNavigator.userAgent read-only property returns the user agent string for the current browser. | 4 | 12 | 3.5 | 4 | 18 | 5 |
1+Supported (version) Not supported ※Has note Sub-feature descriptions sourced from MDN Web Docs (CC BY-SA 2.5)
Syntax
JAVASCRIPT
console.log(navigator.userAgent);
// On Chrome on macOS, logs something like "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36" (reduced UA string)
// On Firefox on Windows, logs something like "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0"Use cases
-
Using User agent sniffing
The Navigator.
Cautions
- May not be supported in older browsers.
Implementation notes
- Some APIs require a secure context (HTTPS) or user activation. Check the requirements before use.