JavaScript obfuscator for Node.js

JavaScript obfuscator for Node.js is a free alternative to js-obfuscator (which uses javascriptobfuscator.com)

• without any limits and sending data to a server;
• compatible with ES6;
• tested on Angular2 bundle;

https://gist.github.com/sanex3339/ffc2876123b52e6d11ce45369fd53acf

Installation

Install the package from NPM and add it to your devDependencies:

$ npm install --save-dev javascript-obfuscator

Usage

var JavaScriptObfuscator = require('javascript-obfuscator');

var obfuscatedCode = JavaScriptObfuscator.obfuscate(
    `
    (function(){
        var variable = 'abc';
        console.log(variable);
    })();
    `,
    {
        rotateUnicodeArray: false
    }
);

console.log(obfuscatedCode);
/*
var _0xabf1 = [
    '\x61\x62\x63', 
    '\x6c\x6f\x67'
];
(function() {
    var _0xe6fab6 = _0xabf1[0x0];
    console[_0xabf1[0x1]](_0xe6fab6);
}());
*/

obfuscate(sourceCode, options)

sourceCode

Type: string Default: null

Any valid source code.

options

Type: Object Default: null

Options for the JavaScript obfuscator:

{
    rotateUnicodeArray: true
    // ...
}

Available options

compact

Type: boolean Default: true

Compact code output one one line.

debugProtection

Type: boolean Default: false

⚠️ Can freeze browser while Developer Tools are enabled! Use at own risk.

Force enable debug mode on page load if Developer Tools panel is enabled (in some, mainly WebKit-based, browsers). This makes it almost impossible to use the Console (the debug panel).

• WebKit-based: blocks the site window, but you still can navigate through Developer Tools panel.
• Firefox: does not block the site window, but still won't let you use DevTools.

debugProtectionInterval

Type: boolean Default: false

⚠️ Can freeze browser even while Developer Tools are disabled! Use at own risk.

Works if debugProtection is enabled.

Force enable debug mode in some browsers (mainly WebKit-based) when Developer Tools panel is enabled, even after page is loaded.

disableConsoleOutput

Type: boolean Default: true

Disable console.log, console.info, console.error and console.warn messages output into the browser console.

encodeUnicodeLiterals

Type: boolean Default: false

⚠️ unicodeArray option must be enabled

This option can slightly slow down your code speed.

All literals in Unicode array become encoded in Base64. To decode strings, a special function will be inserted on the page under unicodeArray node.

reservedNames

Type: string[] Default: []

Disable obfuscation of variable names, function names and names of function parameters that match the passed RegExp pattern.

Example:

	{
		reservedNames: [
			'^someVariable',
			'functionParameter_\d'
		]
	}

rotateUnicodeArray

Type: boolean Default: true

⚠️ unicodeArray must be enabled

Shift the unicodeArray values by a random number of places during the code obfuscation and insert a helper function for shifting the array back into the source code. (It works just like the Caesar cypher.)

Keep in mind that this option affects only how the code is visually organised, since the original arrays can be easily accessed during the debug process.

It is also not recommended to enable rotateUnicodeArray for small source code because a helper function might attract attention.

unicodeArray

Type: boolean Default: true

Put all literal strings into an array and replace every literal string by an array call.

unicodeArrayThreshold

Type: number Default: 0.8 Min: 0 Max: 1

⚠️ unicodeArray option must be enabled

The probability that the literal string will be inserted into unicodeArray. Use this option for huge source code size, because many calls to unicodeArray will slow down code performance.

unicodeArrayThreshold: 0 equals to unicodeArray: false.

wrapUnicodeArrayCalls

Type: boolean Default: true

⚠️ unicodeArray option must be enabled

Instead of using direct calls to unicodeArray items var t = _0x43a123[0x0], when index 0x0 can be easily reverted to 0 with few js beautifiers, this option will wrap all calls to special function instead.

var t = _0x12a634('0x0')