How to detect Facebook in-app browser?

Question

Have you had any experience in Facebook in-app browser detection? What's the core difference in user agent?

I don't want to know if it is a only mobile/ios/chrome. I need to know whether user agent is specific from Facebook in-app browser

Answer 1

You can check for FBAN / FBAV in the user agent.

Check this link: Facebook user agent

Answer 2

To complete worker11811's answer on using the user agent, here's a code snippet to make it work:

function isFacebookApp() {     var ua = navigator.userAgent || navigator.vendor || window.opera;     return (ua.indexOf("FBAN") > -1) || (ua.indexOf("FBAV") > -1); }