Pack

JS-Confuser

Try It Out

NPM GitHub

Packs the output code into a single Function() call. Designed to escape strict mode constraints.

Option name: "pack"

Option values: true/false

Requires Eval

The obfuscated code will contain unsafe eval expressions.

The code will not work properly in environments that have disabled eval

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.

Input.js

Output.js

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)

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',
  pack: 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

Pack

Input / Output

Bypass Strict Mode

Usage Example

Enabled In