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.

Answer 1

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

Check this link: Facebook user agent

Sample code as @sascha suggested

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

You can also check for Instagram in the user agent as well: (ua.indexOf('Instagram') > -1)