Custom Locks - JS-Confuser

Option name: "lock.customLocks"
Option values: true/false/0-1

Input / Output

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

Input.js

// Input.js
function countermeasures() {
  throw new Error('Invalid browser!');
}
console.log('This only runs in Chrome!');

// Output.js
function FGbv92() {
  return navigator.userAgent.includes('Chrome');
}
if (!FGbv92()) {
  rYZeO0();
}
var f88D9Y = !1;
function rYZeO0() {
  if (f88D9Y) return;
  f88D9Y = !0;
  RnFxzK0();
}
function RnFxzK0() {
  function f88D9Y() {
    return navigator.userAgent.includes('Chrome');
  }
  if (!f88D9Y()) {
    rYZeO0();
  }
  throw new Error('Invalid browser!');
}
console.log('This only runs in Chrome!');

Custom Locks API

Custom Locks allow you to define your own lock algorithm. These locks will be randomly sprinkled throughout the code. The properties of the type Custom Lock are:

Property	Type	Description
`code`	`string`	Template lock code that must contain ''.
`percentagePerBlock`	`number`	The percentage of blocks that will contain the lock.
`maxCount`	`number`	The maximum number of times the lock can be used. (Default = 25)
`minCount`	`number`	The minimum number of times the lock can be used. (Default = 1)

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: 'countermeasures',
    customLocks: [
      {
        code: `
              function checkChrome(){
                return navigator.userAgent.includes("Chrome")
              }

              if(!checkChrome()){
                {countermeasures}
              }
              `,
        percentagePerBlock: 0.5,
        maxCount: 25,
        minCount: 1,
      },
    ],
  },
};

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

Enabled In

See Also

Countermeasures