Keyloggers are used to record keystrokes that the victim types into his keyboard. This particular keylogger is written in JavaScript and can only be used in websites where you can modify the source code. Such a feat is only possible via Stored XSS or Man-In-The-Middle attack. To know more about the second method, refer to my video explaining everything regarding developing and deploying a keylogger over a Wi-Fi Network.
(click on the thumbnail to watch the video)
