Biniam Abdullah

Biniam Abdullah

1600163340

A powerful obfuscator for JavaScript and Node.js

JavaScript obfuscator

JavaScript Obfuscator is a powerful free obfuscator for JavaScript, containing a variety of features which provide protection for your source code.

Key features:

  • variables renaming
  • strings extraction and encryption
  • dead code injection
  • control flow flattening
  • various code transformations
  • and more…

The example of obfuscated code: github.com

Online version:

obfuscator.io

Plugins:

npm version FOSSA Status Build Status Coverage Status Backers on Open Collective Sponsors on Open Collective xscode

You can support this project by donating:

Huge thanks to all supporters!

NOTE! the README on the master branch might not match that of the latest stable release!
If you have a question, check this section first: FAQ

⚠️ Important

Only obfuscate the code that belongs to you.

It is not recommended to obfuscate vendor scripts and polyfills, since the obfuscated code is 15-80% slower (depends on options) and the files are significantly larger.

Installation

Using Yarn or NPM

Install the package with Yarn or NPM and add it to your dependencies or devDependencies:

$ yarn add --dev javascript-obfuscator

or

$ npm install --save-dev javascript-obfuscator
In a Browser

From CDN:

<script src="https://cdn.jsdelivr.net/npm/javascript-obfuscator/dist/index.browser.js"></script>

From node_modules:

<script src="./node_modules/javascript-obfuscator/dist/index.browser.js"></script>

Usage

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

var obfuscationResult = JavaScriptObfuscator.obfuscate(
    `
        (function(){
            var variable1 = '5' - 3;
            var variable2 = '5' + 3;
            var variable3 = '5' + - '2';
            var variable4 = ['10','10','10','10','10'].map(parseInt);
            var variable5 = 'foo ' + 1 + 1;
            console.log(variable1);
            console.log(variable2);
            console.log(variable3);
            console.log(variable4);
            console.log(variable5);
        })();
    `,
    {
        compact: false,
        controlFlowFlattening: true,
        controlFlowFlatteningThreshold: 1,
        numbersToExpressions: true,
        simplify: true,
        shuffleStringArray: true,
        splitStrings: true,
        stringArrayThreshold: 1
    }
);

console.log(obfuscationResult.getObfuscatedCode());
/*
var _0x236b = [
    '8|3|2|4|7|',
    'izyPY',
    'ZXpNn',
    'split',
    '1|5|9|6|0',
    'foo\x20',
    'xPhYQ',
    'sKneg',
    'thwwU',
    'log',
    'map'
];
(function (_0x34d326, _0xc4ba4e) {
    var _0xcd0f69 = function (_0x39b54a) {
        while (--_0x39b54a) {
            _0x34d326['push'](_0x34d326['shift']());
        }
    };
    _0xcd0f69(++_0xc4ba4e);
}(_0x236b, 0x31 + 0x42 * -0x27 + 0xbbc));
var _0x17c9 = function (_0x34d326, _0xc4ba4e) {
    _0x34d326 = _0x34d326 - (0x31 + 0x42 * -0x27 + 0x9dd);
    var _0xcd0f69 = _0x236b[_0x34d326];
    return _0xcd0f69;
};
(function () {
    var _0x32cb02 = _0x17c9, _0x41d9b4 = {
            'thwwU': _0x32cb02('0x5') + _0x32cb02('0x9'),
            'xPhYQ': function (_0x176227, _0x3e4c2d) {
                return _0x176227 + _0x3e4c2d;
            },
            'izyPY': function (_0x13389c, _0x58f8bc) {
                return _0x13389c + _0x58f8bc;
            },
            'sKneg': _0x32cb02('0xa'),
            'ZXpNn': function (_0x1e08e1, _0x5cba70) {
                return _0x1e08e1 - _0x5cba70;
            }
        }, _0x2f8df3 = _0x41d9b4[_0x32cb02('0x2')][_0x32cb02('0x8')]('|'), _0x2087f0 = -0x9a * 0x1f + 0x15 * 0x3 + 0x1267;
    while (!![]) {
        switch (_0x2f8df3[_0x2087f0++]) {
        case '0':
            console[_0x32cb02('0x3')](_0x2e20e0);
            continue;
        case '1':
            console[_0x32cb02('0x3')](_0x3c882f);
            continue;
        case '2':
            var _0x39f804 = _0x41d9b4[_0x32cb02('0x0')]('5', -'2');
            continue;
        case '3':
            var _0x700005 = _0x41d9b4[_0x32cb02('0x6')]('5', 0x1818 + 0x11b5 + -0x29ca);
            continue;
        case '4':
            var _0x172286 = [
                '10',
                '10',
                '10',
                '10',
                '10'
            ][_0x32cb02('0x4')](parseInt);
            continue;
        case '5':
            console[_0x32cb02('0x3')](_0x700005);
            continue;
        case '6':
            console[_0x32cb02('0x3')](_0x172286);
            continue;
        case '7':
            var _0x2e20e0 = _0x41d9b4[_0x32cb02('0x6')](_0x41d9b4[_0x32cb02('0x6')](_0x41d9b4[_0x32cb02('0x1')], -0x2596 + -0x27b * 0x1 + 0xdf * 0x2e), 0x1 * 0x1b06 + -0x1b8e * -0x1 + 0x1 * -0x3693);
            continue;
        case '8':
            var _0x3c882f = _0x41d9b4[_0x32cb02('0x7')]('5', 0x1dc1 * -0x1 + 0x1d59 + 0x6b);
            continue;
        case '9':
            console[_0x32cb02('0x3')](_0x39f804);
            continue;
        }
        break;
    }
}());
*/

obfuscate(sourceCode, options)

Returns ObfuscationResult object which contains two public methods:

  • getObfuscatedCode() - returns string with obfuscated code;
  • getSourceMap() - if sourceMap option is enabled - returns string with source map or an empty string if sourceMapMode option is set as inline.

Calling toString() for ObfuscationResult object will return string with obfuscated code.

Method takes two parameters, sourceCode and options – the source code and the opitons respectively:

  • sourceCode (string, default: null) – any valid source code, passed as a string;
  • options (Object, default: null) – an object with options.

For available options, see options.

obfuscateMultiple(sourceCodesObject, options)

Accepts sourceCodesObject that is a map which keys are identifiers of source codes and values are source codes:

{
    foo: 'var foo = 1;',
    bar: 'var bar = 2;'
}

Returns a map object which keys are identifiers of source codes and values are ObfuscationResult objects.

getOptionsByPreset(optionsPreset)

Returns an options object for the passed options preset name.

CLI usage

See CLI options.

Obfuscate single file

Usage:

javascript-obfuscator input_file_name.js [options]
javascript-obfuscator input_file_name.js --output output_file_name.js [options]
javascript-obfuscator input_file_name.js --output output_folder_name [options]
javascript-obfuscator input_folder_name --output output_folder_name [options]

Obfuscation of single input file with .js extension.

If the destination path is not specified with the --output option, the obfuscated file will be saved into the input file directory, with INPUT_FILE_NAME-obfuscated.js name.

Some examples:

javascript-obfuscator samples/sample.js --compact true --self-defending false
// creates a new file samples/sample-obfuscated.js

javascript-obfuscator samples/sample.js --output output/output.js --compact true --self-defending false
// creates a new file output/output.js
Obfuscate directory recursively

Usage:

javascript-obfuscator ./dist [options]
// creates a new obfuscated files under `./dist` directory near the input files with `obfuscated` postfix

javascript-obfuscator ./dist --output ./dist/obfuscated [options]
// creates a folder structure with obfuscated files under `./dist/obfuscated` path

Obfuscation of all .js files under input directory. If this directory contains already obfuscated files with -obfuscated postfix - these files will ignored.

Obfuscated files will saved into the input directory under INPUT_FILE_NAME-obfuscated.js name.

Conditional comments

You can disable and enable obfuscation for specific parts of the code by adding following comments:

  • disable: // javascript-obfuscator:disable or /* javascript-obfuscator:disable */;
  • enable: // javascript-obfuscator:enable or /* javascript-obfuscator:enable */.

Example:

// input
var foo = 1;
// javascript-obfuscator:disable
var bar = 2;

// output
var _0xabc123 = 0x1;
var bar = 2;

Conditional comments affect only direct transformations of AST-tree nodes. All child transformations still will be applied to the AST-tree nodes.

For example:

  • Obfuscation of the variable’s name at its declaration is called direct transformation;
  • Obfuscation of the variable’s name beyond its declaration is called child transformation.

Kind of variables

Kind of variables of inserted nodes will auto-detected, based on most prevailing kind of variables of source code.

Conflicts of identifier names between different files

During obfuscation of the different files, the same names can be generated for the global identifiers between these files. To prevent this set the unique prefix for all global identifiers for each obfuscated file with identifiersPrefix option.

When using CLI this prefix will be added automatically.

Antiviruses false positive virus alerts

Some input source code that will obfuscated with some obfuscation options can trigger false positive alerts in a few antiviruses. If you will get this false positive triggers, try to play with obfuscation options.

  • Try to change stringArrayEncoding option value between rc4 and base64 values or disable it completely;
  • Try to change identifierNamesGenerator option value from hexadecimal on mangled;
  • Try to disable selfDefending.

If this wont help - attach your source code and describe your obfuscation options here: https://github.com/javascript-obfuscator/javascript-obfuscator/issues/51

JavaScript Obfuscator Options

Following options are available for the JS Obfuscator:

options:
{
    compact: true,
    controlFlowFlattening: false,
    controlFlowFlatteningThreshold: 0.75,
    deadCodeInjection: false,
    deadCodeInjectionThreshold: 0.4,
    debugProtection: false,
    debugProtectionInterval: false,
    disableConsoleOutput: false,
    domainLock: [],
    identifierNamesGenerator: 'hexadecimal',
    identifiersDictionary: [],
    identifiersPrefix: '',
    inputFileName: '',
    log: false,
    numbersToExpressions: false,
    optionsPreset: 'default',
    renameGlobals: false,
    renameProperties: false,
    reservedNames: [],
    reservedStrings: [],
    rotateStringArray: true,
    seed: 0,
    selfDefending: false,
    shuffleStringArray: true,
    simplify: true,
    sourceMap: false,
    sourceMapBaseUrl: '',
    sourceMapFileName: '',
    sourceMapMode: 'separate',
    splitStrings: false,
    splitStringsChunkLength: 10,
    stringArray: true,
    stringArrayEncoding: [],
    stringArrayWrappersCount: 1,
    stringArrayWrappersChainedCalls: true,
    stringArrayThreshold: 0.75,
    target: 'browser',
    transformObjectKeys: false,
    unicodeEscapeSequence: false
}
CLI options:
    -v, --version
    -h, --help

    -o, --output

    --compact <boolean>
    --config <string>
    --control-flow-flattening <boolean>
    --control-flow-flattening-threshold <number>
    --dead-code-injection <boolean>
    --dead-code-injection-threshold <number>
    --debug-protection <boolean>
    --debug-protection-interval <boolean>
    --disable-console-output <boolean>
    --domain-lock '<list>' (comma separated)
    --exclude '<list>' (comma separated)
    --identifier-names-generator <string> [dictionary, hexadecimal, mangled, mangled-shuffled]
    --identifiers-dictionary '<list>' (comma separated)
    --identifiers-prefix <string>
    --log <boolean>
    --numbers-to-expressions <boolean>
    --options-preset <string> [default, low-obfuscation, medium-obfuscation, high-obfuscation]
    --rename-globals <boolean>
    --rename-properties <boolean>
    --reserved-names '<list>' (comma separated)
    --reserved-strings '<list>' (comma separated)
    --rotate-string-array <boolean>
    --seed <string|number>
    --self-defending <boolean>
    --shuffle-string-array <boolean>
    --simplify <boolean>
    --map <boolean>
    --map-base-url <string>
    --map-file-name <string>
    --map-mode <string> [inline, separate]
    --split-strings <boolean>
    --split-strings-chunk-length <number>
    --string-array <boolean>
    --string-array-encoding '<list>' (comma separated) [none, base64, rc4]
    --string-array-wrappers-count <number>
    --string-array-wrappers-chained-calls <boolean>
    --string-array-threshold <number>
    --target <string> [browser, browser-no-eval, node]
    --transform-object-keys <boolean>
    --unicode-escape-sequence <boolean>

compact

Type: boolean Default: true

Compact code output on one line.

config

Type: string Default: ``

Name of JS/JSON config file which contains obfuscator options. These will be overridden by options passed directly to CLI

controlFlowFlattening

Type: boolean Default: false

⚠️ This option greatly affects the performance up to 1.5x slower runtime speed. Use controlFlowFlatteningThreshold to set percentage of nodes that will affected by control flow flattening.

Enables code control flow flattening. Control flow flattening is a structure transformation of the source code that hinders program comprehension.

Example:

// input
(function(){
    function foo () {
        return function () {
            var sum = 1 + 2;
            console.log(1);
            console.log(2);
            console.log(3);
            console.log(4);
            console.log(5);
            console.log(6);
        }
    }

    foo()();
})();

// output
(function () {
    function _0x3bfc5c() {
        return function () {
            var _0x3260a5 = {
                'WtABe': '4|0|6|5|3|2|1',
                'GokKo': function _0xf87260(_0x427a8e, _0x43354c) {
                    return _0x427a8e + _0x43354c;
                }
            };
            var _0x1ad4d6 = _0x3260a5['WtABe']['split']('|'), _0x1a7b12 = 0x0;
            while (!![]) {
                switch (_0x1ad4d6[_0x1a7b12++]) {
                case '0':
                    console['log'](0x1);
                    continue;
                case '1':
                    console['log'](0x6);
                    continue;
                case '2':
                    console['log'](0x5);
                    continue;
                case '3':
                    console['log'](0x4);
                    continue;
                case '4':
                    var _0x1f2f2f = _0x3260a5['GokKo'](0x1, 0x2);
                    continue;
                case '5':
                    console['log'](0x3);
                    continue;
                case '6':
                    console['log'](0x2);
                    continue;
                }
                break;
            }
        };
    }

	_0x3bfc5c()();
}());

controlFlowFlatteningThreshold

Type: number Default: 0.75 Min: 0 Max: 1

The probability that the controlFlowFlattening transformation will be applied to any given node.

This setting is especially useful for large code size because large amounts of control flow transformations can slow down your code and increase code size.

controlFlowFlatteningThreshold: 0 equals to controlFlowFlattening: false.

deadCodeInjection

Type: boolean Default: false

⚠️ Dramatically increases size of obfuscated code (up to 200%), use only if size of obfuscated code doesn’t matter. Use deadCodeInjectionThreshold to set percentage of nodes that will affected by dead code injection.
⚠️ This option forcibly enables stringArray option.

With this option, random blocks of dead code will be added to the obfuscated code.

Example:

// input
(function(){
    if (true) {
        var foo = function () {
            console.log('abc');
            console.log('cde');
            console.log('efg');
            console.log('hij');
        };

        var bar = function () {
            console.log('klm');
            console.log('nop');
            console.log('qrs');
        };

        var baz = function () {
            console.log('tuv');
            console.log('wxy');
            console.log('z');
        };

        foo();
        bar();
        baz();
    }
})();

// output
var _0x5024 = [
    'zaU',
    'log',
    'tuv',
    'wxy',
    'abc',
    'cde',
    'efg',
    'hij',
    'QhG',
    'TeI',
    'klm',
    'nop',
    'qrs',
    'bZd',
    'HMx'
];
var _0x4502 = function (_0x1254b1, _0x583689) {
    _0x1254b1 = _0x1254b1 - 0x0;
    var _0x529b49 = _0x5024[_0x1254b1];
    return _0x529b49;
};
(function () {
    if (!![]) {
        var _0x16c18d = function () {
            if (_0x4502('0x0') !== _0x4502('0x0')) {
                console[_0x4502('0x1')](_0x4502('0x2'));
                console[_0x4502('0x1')](_0x4502('0x3'));
                console[_0x4502('0x1')]('z');
            } else {
                console[_0x4502('0x1')](_0x4502('0x4'));
                console[_0x4502('0x1')](_0x4502('0x5'));
                console[_0x4502('0x1')](_0x4502('0x6'));
                console[_0x4502('0x1')](_0x4502('0x7'));
            }
        };
        var _0x1f7292 = function () {
            if (_0x4502('0x8') === _0x4502('0x9')) {
                console[_0x4502('0x1')](_0x4502('0xa'));
                console[_0x4502('0x1')](_0x4502('0xb'));
                console[_0x4502('0x1')](_0x4502('0xc'));
            } else {
                console[_0x4502('0x1')](_0x4502('0xa'));
                console[_0x4502('0x1')](_0x4502('0xb'));
                console[_0x4502('0x1')](_0x4502('0xc'));
            }
        };
        var _0x33b212 = function () {
            if (_0x4502('0xd') !== _0x4502('0xe')) {
                console[_0x4502('0x1')](_0x4502('0x2'));
                console[_0x4502('0x1')](_0x4502('0x3'));
                console[_0x4502('0x1')]('z');
            } else {
                console[_0x4502('0x1')](_0x4502('0x4'));
                console[_0x4502('0x1')](_0x4502('0x5'));
                console[_0x4502('0x1')](_0x4502('0x6'));
                console[_0x4502('0x1')](_0x4502('0x7'));
            }
        };
        _0x16c18d();
        _0x1f7292();
        _0x33b212();
    }
}());

deadCodeInjectionThreshold

Type: number Default: 0.4 Min: 0 Max: 1

Allows to set percentage of nodes that will affected by deadCodeInjection.

debugProtection

Type: boolean Default: false

⚠️ Can freeze your browser if you open the Developer Tools.

This option makes it almost impossible to use the debugger function of the Developer Tools (both on WebKit-based and Mozilla Firefox).

debugProtectionInterval

Type: boolean Default: false

⚠️ Can freeze your browser! Use at own risk.

If checked, an interval is used to force the debug mode on the Console tab, making it harder to use other features of the Developer Tools. Works if debugProtection is enabled.

disableConsoleOutput

Type: boolean Default: false

Disables the use of console.log, console.info, console.error, console.warn, console.debug, console.exception and console.trace by replacing them with empty functions. This makes the use of the debugger harder.

domainLock

Type: string[] Default: []

⚠️ This option does not work with target: 'node'

Allows to run the obfuscated source code only on specific domains and/or sub-domains. This makes really hard for someone to just copy and paste your source code and run it elsewhere.

Multiple domains and sub-domains

It’s possible to lock your code to more than one domain or sub-domain. For instance, to lock it so the code only runs on www.example.com add www.example.com. To make it work on the root domain including any sub-domains (example.com, sub.example.com), use .example.com.

exclude

Type: string[] Default: []

A file names or globs which indicates files to exclude from obfuscation.

identifierNamesGenerator

Type: string Default: hexadecimal

Sets identifier names generator.

Available values:

  • dictionary: identifier names from identifiersDictionary list
  • hexadecimal: identifier names like _0xabc123
  • mangled: short identifier names like a, b, c
  • mangled-shuffled: same as mangled but with shuffled alphabet

identifiersDictionary

Type: string[] Default: []

Sets identifiers dictionary for identifierNamesGenerator: dictionary option. Each identifier from the dictionary will be used in a few variants with a different casing of each character. Thus, the number of identifiers in the dictionary should depend on the identifiers amount at original source code.

identifiersPrefix

Type: string Default: ''

Sets prefix for all global identifiers.

Use this option when you want to obfuscate multiple files. This option helps to avoid conflicts between global identifiers of these files. Prefix should be different for every file.

inputFileName

Type: string Default: ''

Allows to set name of the input file with source code. This name will be used internally for source map generation.

log

Type: boolean Default: false

Enables logging of the information to the console.

numbersToExpressions

Type: boolean Default: false

Enables numbers conversion to expressions

Example:

// input
const foo = 1234;

// output
const foo=-0xd93+-0x10b4+0x41*0x67+0x84e*0x3+-0xff8;

optionsPreset

Type: string Default: default

Allows to set options preset.

Available values:

  • default;
  • low-obfuscation;
  • medium-obfuscation;
  • high-obfuscation.

All addition options will be merged with selected options preset.

renameGlobals

Type: boolean Default: false

⚠️ this option can break your code. Enable it only if you know what it does!

Enables obfuscation of global variable and function names with declaration.

renameProperties

Type: boolean Default: false

⚠️ this option WILL break your code in most cases. Enable it only if you know what it does!

Enables renaming of property names. All built-in DOM properties and properties in core JavaScript classes will be ignored.

To set format of renamed property names use identifierNamesGenerator option.

To control which properties will be renamed use reservedNames option.

Example:

// input
(function () {
    const foo = {
        prop1: 1,
        prop2: 2,
        calc: function () {
            return this.prop1 + this.prop2;
        }
    };

    console.log(foo.calc());
})();

// output
(function () {
    const _0x46529b = {
        '_0x10cec7': 0x1,
        '_0xc1c0ca': 0x2,
        '_0x4b961d': function () {
            return this['_0x10cec7'] + this['_0xc1c0ca'];
        }
    };
    console['log'](_0x46529b['_0x4b961d']());
}());

reservedNames

Type: string[] Default: []

Disables obfuscation and generation of identifiers, which being matched by passed RegExp patterns.

Example:

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

reservedStrings

Type: string[] Default: []

Disables transformation of string literals, which being matched by passed RegExp patterns.

Example:

	{
		reservedStrings: [
			'react-native',
			'\.\/src\/test',
			'some-string_\d'
		]
	}

rotateStringArray

Type: boolean Default: true

⚠️ stringArray must be enabled

Shift the stringArray array by a fixed and random (generated at the code obfuscation) places. This makes it harder to match the order of the removed strings to their original place.

This option is recommended if your original source code isn’t small, as the helper function can attract attention.

seed

Type: string|number Default: 0

This option sets seed for random generator. This is useful for creating repeatable results.

If seed is 0 - random generator will work without seed.

selfDefending

Type: boolean Default: false

⚠️ Don’t change obfuscated code in any way after obfuscation with this option, because any change like uglifying of code can trigger self defending and code wont work anymore!
⚠️ This option forcibly sets compact value to true

This option makes the output code resilient against formatting and variable renaming. If one tries to use a JavaScript beautifier on the obfuscated code, the code won’t work anymore, making it harder to understand and modify it.

shuffleStringArray

Type: boolean Default: true

⚠️ stringArray must be enabled

Randomly shuffles the stringArray array items.

simplify

Type: boolean Default: true

Enables additional code obfuscation through simplification.

⚠️ in future releases obfuscation of boolean literals (true => !![]) will be moved under this option.

Example:

// input
if (condition1) {
    const foo = 1;
    const bar = 2;

    console.log(foo);

    return bar;
} else if (condition2) {
    console.log(1);
    console.log(2);
    console.log(3);

    return 4;
} else {
    return 5;
}

// output
if (condition1) {
    const foo = 0x1, bar = 0x2;
    return console['log'](foo), bar;
} else
    return condition2 ? (console['log'](0x1), console['log'](0x2), console['log'](0x3), 0x4) : 0x5;

sourceMap

Type: boolean Default: false

Enables source map generation for obfuscated code.

Source maps can be useful to help you debug your obfuscated JavaScript source code. If you want or need to debug in production, you can upload the separate source map file to a secret location and then point your browser there.

sourceMapBaseUrl

Type: string Default: ``

Sets base url to the source map import url when sourceMapMode: 'separate'.

CLI example:

javascript-obfuscator input.js --output out.js --map true --map-base-url 'http://localhost:9000'

Result:

//# sourceMappingURL=http://localhost:9000/out.js.map

sourceMapFileName

Type: string Default: ``

Sets file name for output source map when sourceMapMode: 'separate'.

CLI example:

javascript-obfuscator input.js --output out.js --map true --map-base-url 'http://localhost:9000' --map-file-name example

Result:

//# sourceMappingURL=http://localhost:9000/example.js.map

sourceMapMode

Type: string Default: separate

Specifies source map generation mode:

  • inline - emit a single file with source maps instead of having a separate file;
  • separate - generates corresponding ‘.map’ file with source map. In case you run obfuscator through CLI - adds link to source map file to the end of file with obfuscated code //# sourceMappingUrl=file.js.map.

splitStrings

Type: boolean Default: false

Splits literal strings into chunks with length of splitStringsChunkLength option value.

Example:

// input
(function(){
    var test = 'abcdefg';
})();

// output
(function(){
    var _0x5a21 = 'ab' + 'cd' + 'ef' + 'g';
})();

splitStringsChunkLength

Type: number Default: 10

Sets chunk length of splitStrings option.

stringArray

Type: boolean Default: true

Removes string literals and place them in a special array. For instance, the string "Hello World" in var m = "Hello World"; will be replaced with something like var m = _0x12c456[0x1];

stringArrayEncoding

Type: string[] Default: []

⚠️ stringArray option must be enabled

This option can slow down your script.

Encode all string literals of the stringArray using base64 or rc4 and inserts a special code that used to decode it back at runtime.

Each stringArray value will be encoded by the randomly picked encoding from the passed list. This makes possible to use multiple encodings.

Available values:

  • 'none' (boolean): doesn’t encode stringArray value
  • 'base64' (string): encodes stringArray value using base64
  • 'rc4' (string): encodes stringArray value using rc4. About 30-50% slower than base64, but more harder to get initial values. It’s recommended to disable unicodeEscapeSequence option when using rc4 encoding to prevent very large size of obfuscated code.

For example with the following option values some stringArray value won’t be encoded, and some values will be encoded with base64 and rc4 encoding:

stringArrayEncoding: [
    'none',
    'base64',
    'rc4'
]

stringArrayWrappersCount

Type: number Default: 1

⚠️ stringArray option must be enabled

Sets the count of wrappers for the string array inside each root or function scope. The actual count of wrappers inside each scope is limited by a count of literal nodes within this scope.

Example:

// Input
const foo = 'foo';
const bar = 'bar';

function test () {
    const baz = 'baz';
    const bark = 'bark';
    const hawk = 'hawk';
}

const eagle = 'eagle';

// Output, stringArrayWrappersCount: 5
const _0x3018 = [
    'foo',
    'bar',
    'baz',
    'bark',
    'hawk',
    'eagle'
];
const _0x380f = function (_0x30182a, _0x380f29) {
    _0x30182a = _0x30182a - 0x0;
    let _0x4e002c = _0x3018[_0x30182a];
    return _0x4e002c;
};
const _0xe4db7c = _0x380f;
const _0x26ca42 = _0x380f;
const _0x58c610 = _0x380f;
const foo = _0x58c610('0x0');
const bar = _0x26ca42('0x1');
function test() {
    const _0x500eda = _0x380f;
    const _0x1d1760 = _0x380f;
    const _0x4ca8b0 = _0x380f;
    const _0x4e002c = _0x4ca8b0('0x2');
    const _0x573b1c = _0x1d1760('0x3');
    const _0x1fb6ef = _0x500eda('0x4');
}
const eagle = _0x26ca42('0x5');

stringArrayWrappersChainedCalls

Type: boolean Default: true

⚠️ stringArray and stringArrayWrappersCount options must be enabled

Enables the chained calls between string array wrappers.

Example:

// Input
const foo = 'foo';
const bar = 'bar';

function test () {
    const baz = 'baz';
    const bark = 'bark';

    function test1() {
        const hawk = 'hawk';
        const eagle = 'eagle';
    } 
}

// Output, stringArrayWrappersCount: 5, stringArrayWrappersChainedCalls: true
const _0x4714 = [
    'foo',
    'bar',
    'baz',
    'bark',
    'hawk',
    'eagle'
];
const _0x2bdb = function (_0x471439, _0x2bdb71) {
    _0x471439 = _0x471439 - 0x0;
    let _0x6e47e6 = _0x4714[_0x471439];
    return _0x6e47e6;
};
const _0x1c3d52 = _0x2bdb;
const _0xd81c2a = _0x2bdb;
const foo = _0xd81c2a('0x0');
const bar = _0x1c3d52('0x1');
function test() {
    const _0x21a0b4 = _0x1c3d52;
    const _0x12842d = _0xd81c2a;
    const _0x6e47e6 = _0x12842d('0x2');
    const _0x4f3aef = _0x12842d('0x3');
    function _0x40f1dc() {
        const _0x468540 = _0x12842d;
        const _0x1f4b05 = _0x21a0b4;
        const _0x40a980 = _0x1f4b05('0x4');
        const _0x4d1285 = _0x468540('0x5');
    }
}

stringArrayThreshold

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

⚠️ stringArray option must be enabled

You can use this setting to adjust the probability (from 0 to 1) that a string literal will be inserted into the stringArray.

This setting is especially useful for large code size because it repeatedly calls to the string array and can slow down your code.

stringArrayThreshold: 0 equals to stringArray: false.

target

Type: string Default: browser

Allows to set target environment for obfuscated code.

Available values:

  • browser;
  • browser-no-eval;
  • node.

Currently output code for browser and node targets is identical, but some browser-specific options are not allowed to use with node target. Output code for browser-no-eval target is not using eval.

transformObjectKeys

Type: boolean Default: false

Enables transformation of object keys.

Example:

// input
(function(){
    var object = {
        foo: 'test1',
        bar: {
            baz: 'test2'
        }
    };
})();

// output
var _0x2fae = [
    'baz',
    'test2',
    'foo',
    'test1',
    'bar'
];
var _0x377c = function (_0x1fbd3f, _0x59c72f) {
    _0x1fbd3f = _0x1fbd3f - 0x0;
    var _0x14fada = _0x2fae[_0x1fbd3f];
    return _0x14fada;
};
(function () {
    var _0x8a12db = {};
    _0x8a12db[_0x377c('0x0')] = _0x377c('0x1');
    var _0xc75419 = {};
    _0xc75419[_0x377c('0x2')] = _0x377c('0x3');
    _0xc75419[_0x377c('0x4')] = _0x8a12db;
    var _0x191393 = _0xc75419;
}());

unicodeEscapeSequence

Type: boolean Default: false

Allows to enable/disable string conversion to unicode escape sequence.

Unicode escape sequence increases code size greatly and strings easily can be reverted to their original view. Recommended to enable this option only for small source code.

Preset Options

High obfuscation, low performance

Performance will 50-100% slower than without obfuscation

{
    compact: true,
    controlFlowFlattening: true,
    controlFlowFlatteningThreshold: 1,
    deadCodeInjection: true,
    deadCodeInjectionThreshold: 1,
    debugProtection: true,
    debugProtectionInterval: true,
    disableConsoleOutput: true,
    identifierNamesGenerator: 'hexadecimal',
    log: false,
    numbersToExpressions: true,
    renameGlobals: false,
    rotateStringArray: true,
    selfDefending: true,
    shuffleStringArray: true,
    simplify: true,
    splitStrings: true,
    splitStringsChunkLength: 5,
    stringArray: true,
    stringArrayEncoding: ['rc4'],
    stringArrayWrappersCount: 5,
    stringArrayWrappersChainedCalls: true,
    stringArrayThreshold: 1,
    transformObjectKeys: true,
    unicodeEscapeSequence: false
}

Medium obfuscation, optimal performance

Performance will 30-35% slower than without obfuscation

{
    compact: true,
    controlFlowFlattening: true,
    controlFlowFlatteningThreshold: 0.75,
    deadCodeInjection: true,
    deadCodeInjectionThreshold: 0.4,
    debugProtection: false,
    debugProtectionInterval: false,
    disableConsoleOutput: true,
    identifierNamesGenerator: 'hexadecimal',
    log: false,
    numbersToExpressions: true,
    renameGlobals: false,
    rotateStringArray: true,
    selfDefending: true,
    shuffleStringArray: true,
    simplify: true,
    splitStrings: true,
    splitStringsChunkLength: 10,
    stringArray: true,
    stringArrayEncoding: ['base64'],
    stringArrayWrappersCount: 2,
    stringArrayWrappersChainedCalls: true,
    stringArrayThreshold: 0.75,
    transformObjectKeys: true,
    unicodeEscapeSequence: false
}

Low obfuscation, High performance

Performance will slightly slower than without obfuscation

{
    compact: true,
    controlFlowFlattening: false,
    deadCodeInjection: false,
    debugProtection: false,
    debugProtectionInterval: false,
    disableConsoleOutput: true,
    identifierNamesGenerator: 'hexadecimal',
    log: false,
    numbersToExpressions: false,
    renameGlobals: false,
    rotateStringArray: true,
    selfDefending: true,
    shuffleStringArray: true,
    simplify: true,
    splitStrings: false,
    stringArray: true,
    stringArrayEncoding: [],
    stringArrayWrappersCount: 1,
    stringArrayWrappersChainedCalls: true,
    stringArrayThreshold: 0.75,
    unicodeEscapeSequence: false
}

Default preset, High performance

{
    compact: true,
    controlFlowFlattening: false,
    deadCodeInjection: false,
    debugProtection: false,
    debugProtectionInterval: false,
    disableConsoleOutput: false,
    identifierNamesGenerator: 'hexadecimal',
    log: false,
    numbersToExpressions: false,
    renameGlobals: false,
    rotateStringArray: true,
    selfDefending: false,
    shuffleStringArray: true,
    simplify: true,
    splitStrings: false,
    stringArray: true,
    stringArrayEncoding: [],
    stringArrayWrappersCount: 1,
    stringArrayWrappersChainedCalls: true,
    stringArrayThreshold: 0.75,
    unicodeEscapeSequence: false
}

Frequently Asked Questions

What javascript versions are supported?

es3, es5, es2015, es2016, es2017, es2018, es2019 and partially es2020

I want to use feature that described in README.md but it’s not working!

The README on the master branch might not match that of the latest stable release.

Why CLI command not working?

Try to run npm link javascript-obfuscator command or install it globally with npm i -g javascript-obfuscator

Error maximum call stack size exceeded

Likely this is selfDefending mechanism. Something is changing source code after obfuscation with selfDefending option.

Online version?

obfuscator.io

JSX support?

No. JSX support isn’t planned.

How to change kind of variables of inserted nodes (var, let or const)?

See: Kind of variables

Why I got null value instead of BigInt number?

BigInt obfuscation works correctly only in environments that support BigInt values. See ESTree spec

I enabled renameProperties option, and my code broke! What to do?

Just disable this option.

Download Details:

Author: javascript-obfuscator

Demo: https://obfuscator.io/

Source Code: https://github.com/javascript-obfuscator/javascript-obfuscator

#node #nodejs #javascript

What is GEEK

Buddha Community

A powerful obfuscator for JavaScript and Node.js
WebClues Infotech

WebClues Infotech

1616671994

Hire Dedicated Node.js Developers - Hire Node.js Developers

If you look at the backend technology used by today’s most popular apps there is one thing you would find common among them and that is the use of NodeJS Framework. Yes, the NodeJS framework is that effective and successful.

If you wish to have a strong backend for efficient app performance then have NodeJS at the backend.

WebClues Infotech offers different levels of experienced and expert professionals for your app development needs. So hire a dedicated NodeJS developer from WebClues Infotech with your experience requirement and expertise.

So what are you waiting for? Get your app developed with strong performance parameters from WebClues Infotech

For inquiry click here: https://www.webcluesinfotech.com/hire-nodejs-developer/

Book Free Interview: https://bit.ly/3dDShFg

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Aria Barnes

Aria Barnes

1622719015

Why use Node.js for Web Development? Benefits and Examples of Apps

Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.

What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

  • quick execution and information preparing; 
  • exceptionally reusable code; 
  • the code is not difficult to learn, compose, read, and keep up; 
  • tremendous asset library, a huge number of free aides, and a functioning local area. 

In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

Designers Can Utilize JavaScript for the Whole Undertaking 

This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based. 

A Quick Environment for Microservice Development 

There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.

Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.

 

Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

Original Source

#node.js development company in india #node js development company #hire node js developers #hire node.js developers in india #node.js development services #node.js development

Amelia Williams

1616839211

Node JS Development Company| Node JS Web Developers-SISGAIN

Top organizations and start-ups hire Node.js developers from SISGAIN for their strategic software development projects in Illinois, USA. On the off chance that you are searching for a first rate innovation to assemble a constant Node.js web application development or a module, Node.js applications are the most appropriate alternative to pick. As Leading Node.js development company, we leverage our profound information on its segments and convey solutions that bring noteworthy business results. For more information email us at hello@sisgain.com

#node.js development services #hire node.js developers #node.js web application development #node.js development company #node js application

Amelia Williams

1624450037

Node JS Development Advantages - How Your App Will Benefit From This JavaScript Framework

Web development has been controlling the JavaScript system features for many years. Many big online sites use Java Script for their everyday operations. And recently there has been a change and a shift towards cross-platform mobile application development. The main software frameworks in work these days are React native, apache Cordova, native script and hybrid tools. In the last ten years, Node.JS has been used as a backend development framework. Developers nowadays want to learn and use the same technologies for one entire website. They do not want to learn an entire language for server development. And Node.JS is able to adapt all the functions and syntaxes to the backend services from JavaScript. If you do not know the languages or syntaxes for Node JS development, you can look for an online guide. These guides have a detailed overview of the additional functions and basic systems. You will also find simple tasks in these guides. To read more click on the link.

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sophia tondon

sophia tondon

1625114985

Top 10 NodeJs app Development Companies- ValueCoders

Node.js is a prominent tech trend in the space of web and mobile application development. It has been proven very efficient and useful for a variety of application development. Thus, all business owners are eager to leverage this technology for creating their applications.

Are you striving to develop an application using Node.js? But can’t decide which company to hire for NodeJS app development? Well! Don’t stress over it, as the following list of NodeJS app development companies is going to help you find the best partner.

Let’s take a glance at top NodeJS application development companies to hire developers in 2021 for developing a mind-blowing application solution.

Before enlisting companies, I would like to say that every company has a foundation on which they thrive. Their end goals, qualities, and excellence define their competence. Thus, I prepared this list by considering a number of aspects. While making this list, I have considered the following aspects:

  • Review and rating
  • Enlisted by software peer & forums
  • Hourly price
  • Offered services
  • Year of experience (Average 8+ years)
  • Credibility & Excellence
  • Served clients and more

I believe this list will help you out in choosing the best NodeJS service provider company. So, now let’s explore the top NodeJS developer companies to choose from in 2021.

#1. JSGuru

JSGuru is a top-rated NodeJS app development company with an innovative team of dedicated NodeJS developers engaged in catering best-class UI/UX design, software products, and AWS professional services.

It is a team of one of the most talented developers to hire for all types of innovative solution development, including social media, dating, enterprise, and business-oriented solutions. The company has worked for years with a number of startups and launched a variety of products by collaborating with big-name corporations like T-systems.

If you want to hire NodeJS developers to secure an outstanding application, I would definitely suggest them. They serve in the area of eLearning, FinTech, eCommerce, Telecommunications, Mobile Device Management, and more.

  • Ratings: 4.9/5.0

  • Founded: 2006

  • Headquarters: Banja Luka, Bosnia, and Herzegovina

  • Price: Starting from $50/hour

Visit Website - https://www.valuecoders.com/blog/technology-and-apps/top-node-js-app-development-companies

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