Rename Variables

Option name: "renameVariables"
Option values: true/false/Function

Input / Output

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

Input.js

// Input.js
var twoSum = function (nums, target) {
  var hash = {};
  var len = nums.length;
  for (var i = 0; i < len; i++) {
    if (nums[i] in hash) return [hash[nums[i]], i];
    hash[target - nums[i]] = i;
  }
  return [-1, -1];
};

var test = function () {
  var inputNums = [2, 7, 11, 15];
  var inputTarget = 9;
  var expectedResult = [0, 1];

  var actualResult = twoSum(inputNums, inputTarget);
  ok(actualResult[0] === expectedResult[0]);
  ok(actualResult[1] === expectedResult[1]);
};

test();

// Output.js
var NuNuUw = function (NuNuUw, D9jnem) {
    var fOHfw1 = {},
      b6kIuF = NuNuUw.length;
    for (var RT0b4YA = 0; RT0b4YA < b6kIuF; RT0b4YA++) {
      if (NuNuUw[RT0b4YA] in fOHfw1) {
        return [fOHfw1[NuNuUw[RT0b4YA]], RT0b4YA];
      }
      fOHfw1[D9jnem - NuNuUw[RT0b4YA]] = RT0b4YA;
    }
    return [-1, -1];
  },
  D9jnem = function () {
    var D9jnem = [2, 7, 11, 15],
      m54g60p = 9,
      Qrjetu = [0, 1],
      F9DNLKi = NuNuUw(D9jnem, m54g60p);
    ok(F9DNLKi[0] === Qrjetu[0]);
    ok(F9DNLKi[1] === Qrjetu[1]);
  };
D9jnem();

Access the renamed variable

The comment syntax /* @js-confuser-var */ "varName" provides a method to access variable mappings. This is especially useful for eval() scenarios where you want preserve the mapping.

// Input
var message = "Hello world!";
eval(`console.log(${ /* @js-confuser-var */ "message"  })`);

console.log("message was renamed to", /* @js-confuser-var */ "message");

// Output
var nSgZyJf = "Hello world!";
eval(`console.log(nSgZyJf)`) // "Hello world!"
console["log"]("message was renamed to", "nSgZyJf") // message was renamed to nSgZyJf

Even if Rename Variables is disabled, the comment /* @js-confuser-var */ will still be removed. (The original name will be returned as a string)

Never rename a variable

The prefix __NO_JS_CONFUSER_RENAME__ disables renaming a certain variable. This can be useful for debugging the obfuscator.

// Input
var __NO_JS_CONFUSER_RENAME__message1 = "My first message"
var message2 = "My other message"

console.log(__NO_JS_CONFUSER_RENAME__message1)
console.log(message2)

// Output
var __NO_JS_CONFUSER_RENAME__message1 = "My first message";
var jRLf713 = "My other message";

console.log(__NO_JS_CONFUSER_RENAME__message1),
console.log(jRLf713)

Custom Implementation

`options.renameVariables(varName)`

Control which variable names are changed. Returns a boolean.

Parameter	Type	Description
`varName`	`string`	The variable name proposed to be changed.

Options.js

module.exports = {
  target: "node",

  // Disable renaming a certain variable
  renameVariables: (varName) => varName != "jQuery",
};

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',
  renameVariables: true,
};

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

Access the renamed variable

Never rename a variable

Custom Implementation

`options.renameVariables(varName)`

Usage Example

Enabled In

​Input / Output

​Access the renamed variable

​Never rename a variable

​Custom Implementation

​options.renameVariables(varName)

​Usage Example

​Enabled In

Input / Output

Access the renamed variable

Never rename a variable

Custom Implementation

`options.renameVariables(varName)`

Usage Example

Enabled In