Countermeasures

Option name: "lock.countermeasures"
Option value: string

Input / Output

This example showcases how Countermeasures transforms the code. Try it out by changing the input code and see changes apply in real-time.

Input.js

// Input.js
function onTamperDetected() {
  throw new Error('The code has been tampered with!');
}

// Output.js
var NY0SMF = !1;
function gy78un() {
  if (NY0SMF) return;
  NY0SMF = !0;
  oGq6X3v();
}
function oGq6X3v() {
  throw new Error('The code has been tampered with!');
}

Crash Process

The default behavior is to crash the process This is done by an infinite loop to ensure the process becomes useless.

while(true) {
  // ...
}

Custom Callback

By setting countermeasures to a string, it can point to a callback to invoke when a lock is triggered. The countermeasures callback function can either be a local name or an external name. Examples:

"onLockTriggered"
"window.onLockTriggered"

If the function is defined within the locked code, it must follow the local name rules.

Local Name rules

The function must be defined at the top-level of your program.
The function must not rely on any scoped variables.
The function cannot call functions outside it’s context.

These rules are necessary to prevent an infinite loop from occurring.

Test your countermeasure

Domain Lock:

Try your code within DevTools while on another website.

Time Lock:

Try setting your machine time to before or past the allowed range.

Integrity:

Try changing a string within your code.

Usage Example

The provided code example will obfuscate the file input.js and write the output to a file named output.js.

Usage Example

import JSConfuser from "js-confuser";
import {readFileSync, writeFileSync} from "fs";

// Read input code
const sourceCode = readFileSync("input.js", "utf8");
const options = {
  target: 'browser',
  lock: {
    countermeasures: 'onTamperDetected',
  },
};

JSConfuser.obfuscate(sourceCode, options).then((result)=>{
  // Write output code
  writeFileSync("output.js", result.code);
}).catch(err=>{
  // Error occurred
  console.error(err);  
});

Getting Started

Options

Presets

Input / Output

Crash Process

Custom Callback

Local Name rules

Test your countermeasure

Domain Lock:

Time Lock:

Integrity:

Usage Example

Enabled In

See Also

​Input / Output

​Crash Process

​Custom Callback

​Local Name rules

​Test your countermeasure

​Domain Lock:

​Time Lock:

​Integrity:

​Usage Example

​Enabled In

​See Also

Input / Output

Crash Process

Custom Callback

Local Name rules

Test your countermeasure

Domain Lock:

Time Lock:

Integrity:

Usage Example

Enabled In

See Also