Rename Variables

JS-Confuser

Rename Variables

Determines if variables should be renamed.

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

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

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.

Code

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.

Code

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

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);  
});

Enabled In

Feedback

Please help us improve by
providing feedback

View Source

Contents

Rename Variables

Input / Output

Access the renamed variable

Never rename a variable

Custom Implementation

options.renameVariables(varName)

Usage Example

Enabled In