JScrambler Client for Node.js

• RC config
• CLI
  • Required Fields
  • Output to a single file
  • Output multiple files to a directory
  • Using minimatch
  • Using configuration file
• API
  • Upload/download example
• JScrambler Options
  • asserts_elimination
  • browser_os_lock
  • constant_folding
  • dead_code
  • dead_code_elimination
  • debugging_code_elimination
  • dictionary_compression
  • domain_lock
  • domain_lock_warning_function
  • dot_notation_elimination
  • exceptions_list
  • expiration_date
  • expiration_date_warning_function
  • function_outlining
  • function_reorder
  • ignore_files
  • literal_hooking
  • duplicate_literals
  • member_enumeration
  • mode
  • name_prefix
  • rename_all
  • rename_local
  • self_defending
  • string_splitting
  • whitespace

RC configuration

You may put your access and secret keys into a config file if found in these directories. Besides simplifying the command entry, this has the added benefit of not logging your JScrambler credentials.

Here's an example of what your .jscramblerrc file should look like:

{
  "keys": {
    "accessKey": "XXXXXX",
    "secretKey": "XXXXXX"
  },
  "params": {
    "self_defending": "%DEFAULT%"
  }
}

Replace the XXXXXX fields with your values of course. :)

CLI

npm install -g jscrambler

Usage: jscrambler [source files] [options]

Options:

  --help
  -V, --version
  -c, --config [config]
  -o, --output [output]
  -a, --access-key <accessKey>
  -s, --secret-key <secretKey>
  -h, --host [host]
  -p, --port [port]
  -v, --api-version [apiVersion]
  --asserts-elimination [assertsElimination]
  --browser-os-lock [browserOsLock]
  --constant-folding
  --dead-code
  --dead-code-elimination
  --debugging-code-elimination [debuggingCodeElimination]
  --dictionary-compression
  --domain-lock [domainLock]
  --domain-lock-warning-function [domainLockWarningFunction]
  --dot-notation-elimination
  --exceptions-list [exceptionsList]
  --expiration-date [expirationDate]
  --expiration-date-warning-function [expirationDateWarningFunction]
  --function-outlining
  --function-reorder
  --ignore-files [ignoreFiles]
  --literal-hooking [literalHooking]
  --literal-duplicates
  --member-enumeration
  --mode [mode]
  --name-prefix [namePrefix]
  --rename-all
  --rename-local
  --self-defending
  --string-splitting [stringSplitting]
  --whitespace

Required Fields

When making API requests you must pass valid secret and access keys, through the command line or by having a .jscramblerrc file. These keys are each 40 characters long, alpha numeric strings, and uppercase. You can find them in your jscramber web dashboard under My Account > Api access. In the examples these are shortened to XXXX for the sake of readability.

Output to a single file

jscrambler input.js -a XXXX -s XXXX > output.js

Output multiple files to a directory

jscrambler input1.js input2.js -o dest/ -a XXXX -s XXXX

Using minimatch

jscrambler "lib/**/*.js" -o dest/ -a XXXX -s XXXX

Using configuration file

jscrambler input.js -s XXXX -a XXXX -c ./config.json > output.js

where config.json is an object optionally containing any of the JScrambler options listed here.

API

npm install jscrambler

Upload/download example

var fs = require('fs-extra');
var jScrambler = require('jscrambler');

var client = new jScrambler.Client({
  keys: {
    accessKey: '', // not needed if you have it on your `.jscramblerrc`
    secretKey: '' // not needed if you have it on your `.jscramblerrc`
  }
});

jScrambler
  .uploadCode(client, {
    files: ['index.js'],
    // Node.js obfuscation settings
    rename_local: '%DEFAULT%',
    whitespace: '%DEFAULT%',
    literal_hooking: '%DEFAULT%',
    dead_code: '%DEFAULT%',
    dot_notation_elimination: '%DEFAULT%',
    dead_code_elimination: '%DEFAULT%',
    constant_folding: '%DEFAULT%',
    literal_duplicates: '%DEFAULT%',
    function_outlining: '%DEFAULT%',
    string_splitting:'%DEFAULT%'
  })
  .then(function (res) {
    return jScrambler.downloadCode(client, res.id);
  })
  .then(function (res) {
    fs.outputFileSync('dist.zip', res);
  });

JScrambler Options

The following options are passed to the JScrambler services through the CLI config file or some API methods. More information about them can be found here.

asserts_elimination

Type: String

name1;name2;... - assert function names

Remove function definitions and function calls with a given name.

browser_os_lock

Type: String

Locks a JavaScript application to run only on a specific Browser or Operating System.

available values:

• firefox
• chrome
• iexplorer
• linux
• windows
• mac_os
• tizen
• android
• ios

constant_folding

Type: String

%DEFAULT% - enable constant folding

Simplifies constant expressions at compile-time to make your code faster at run-time.

dead_code

Type: String

%DEFAULT% - enable dead code

Randomly injects dead code into the source code.

dead_code_elimination

Type: String

%DEFAULT% - enable dead code elimination

Removes dead code and void code from your JavaScript.

debugging_code_elimination

Type: String

name1;name2;... - debugging code names

Removes statements and public variable declarations used to control the output of debugging messages that help you debug your code.

dictionary_compression

Type: String

%DEFAULT% - enable dictionary compression

Dictionary compression to shrink even more your source code.

domain_lock

Type: String

domain1;domain2;... - your domains

Locks your project to a list of domains you specify.

domain_lock_warning_function

Type: String

name - your domain lock warning function.

Executes a function whenever there's a domain lock violation.

dot_notation_elimination

Type: String

%DEFAULT% - enable dot notation elimination

Transforms dot notation to subscript notation.

exceptions_list

Type: String

name;name1;name2;... - list of exceptions that will never be replaced or used to create new declarations

There are some names that should never be replaced or reused to create new declarations e.g. document, toUpperCase. Public declarations existing in more than one source file should not be replaced if you submit only a part of the project where they appear. Therefore a list of irreplaceable names and the logic to make distinction between public and local names already exists on JScrambler to avoid touching those names. Use this parameter to add your own exceptions.

expiration_date

Type: String

date - date format YYYY/MM/DD

Sets your JavaScript to expire after a date of your choosing.

expiration_date_warning_function

Type: String

name - your expiration date warning function.

Executes a function whenever there's an expiration date violation.

function_outlining

Type: String

%DEFAULT% - enable function outlining

Turns statements into new function declarations.

function_reorder

Type: String

%DEFAULT% - enable function reordering

Randomly reorders your source code's function declarations.

ignore_files

Type: String

filename;filename1 - List of files (relative paths) to be ignored

Define a list of files (relative paths) that JScrambler must ignore.

literal_hooking

Type: String

min;max[;percentage] - min and max predicates in ternary operator and percentage chance of replacement

Replaces literals by a randomly sized chain of ternary operators. You may configure the minimum and maximum number of predicates per literal, as the occurrence probability of the transformation. This allows you to control how big the obfuscated JavaScript grows and the potency of the transformation.

duplicate_literals

Type: String

%DEFAULT% - enable duplicate literals

Replaces literal duplicates by a symbol.

member_enumeration

Type: String

%DEFAULT% - enable member enumeration

Replaces Browser and HTML DOM objects by a member enumeration.

mode

Type: String

• starter - Standard protection and optimization behavior. Enough for most * JavaScript applications
• mobile - Transformations are applied having into account the limitations and needs of mobile devices
• html5 - Protects your HTML5 and Web Gaming applications by targeting the new HTML5 features
• nodejs - Protects your Node.js application

name_prefix

Type: String

Set a prefix to be appended to the new names generated by JScrambler.

rename_all

Type: String

%DEFAULT% - enable rename all

Renames all identifiers found at your source code. By default, there is a list of JavaScript and HTML DOM names that will not be replaced. If you need to add additional exceptions use the exceptions_list parameter.

rename_local

Type: String

%DEFAULT% - enable rename local

Renames local names only. The best way to replace names without worrying about name dependencies.

self_defending

Type: String

%DEFAULT% - enable self defending

Obfuscates functions and objects concealing their logic and thwarting code tampering attempts by using anti-tampering and anti-debugging techniques. Attempts to tamper the code will break its functionality and using JavaScript debuggers will trigger defenses to thwart analysis.

string_splitting

Type: String

occurrences[;concatenation]

occurrences - Percentage of occurrences. Accepted values between 0.01 and 1. concatenation - Percentage of concatenation occurrences. Accepted values between 0 and 1 (0 means chunks of a single character and 1 the whole string).

whitespace

Type: String

%DEFAULT% - enable whitespace

Shrink the size of your JavaScript removing unnecessary whitespaces and newlines from the source code.