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Documentation Index

Fetch the complete documentation index at: https://docs.js-confuser.com/llms.txt

Use this file to discover all available pages before exploring further.

  • Option name: "pack"
  • Option values: true/false
[!WARNING] Requires Eval The obfuscated code will contain unsafe eval expressions. The code will not work properly in environments that have disabled eval

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Input / Output

This example showcases how Pack transforms the code. Try it out by changing the input code and see changes apply in real-time. 
// This file is evaluated as JavaScript. You can use JavaScript here.
// Learn more: https://js-confuser.com/docs/getting-started/playground#jsconfuser-ts

module.exports = {
  target: 'browser',
  pack: true,
  renameVariables: true,
  compact: false,
  minify: true,
};
===END OPTIONS===

// Strict mode JavaScript blocks eval() access to local variables
var myVar = "Initial Value";
eval((/* @js-confuser-var */ "myVar") + ' = "Modified Value"');

console.log(myVar); // "Modified Value"

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Bypass Strict Mode

The Pack option is designed to bypass strict mode constraints. This is achieved by wrapping the output code in a Function() call. This allows the code to be executed in a different context, where strict mode is not enforced. Several obfuscation techniques require non-strict mode JavaScript. These include:
  • With Statement (Control Flow Flattening)
  • Eval scope access (Tamper Protection)

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Usage Example

The provided code example will obfuscate the file input.js and write the output to a file named output.js. 
import JSConfuser from "js-confuser";
import {readFileSync, writeFileSync} from "fs";

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

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