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Jscrambler Client for Browser and Node.js

DISCLAIMER: If you are looking for Jscrambler 3.8 or below please go to this page.


On your project:

npm i jscrambler --save-dev

Or globally:

npm i -g jscrambler

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": "AAAA",
    "secretKey": "SSSS"
  "applicationId": "XXXXX",
  "filesSrc": [
  "filesDest": "/path/to/destDir/",
  "params": [
      "name": "stringSplitting"
  "areSubscribersOrdered": false,
  "jscramblerVersion": "5.1"

Please, replace the AAAA, SSSS and XXXXX placeholders with your API credentials and Application ID.

You can also download this file through Jscrambler's application builder. More information can be found here.


npm install -g jscrambler
  Usage: jscrambler [options] <file ...>


    -h, --help                       output usage information
    -V, --version                    output the version number
    -a, --access-key <accessKey>     Access key
    -c, --config <config>            JScrambler configuration options
    -H, --host <host>                Hostname
    -i, --application-id <id>        Application ID
    -o, --output-dir <dir>           Output directory
    -p, --port <port>                Port
    --protocol <protocol>            Protocol (http or https)
    --cafile <path>                  Internal certificate authority
    -C, --cwd <dir>                  Current Working Directory
    -m, --source-maps <id>           Download source maps
    -R, --randomization-seed <seed>  Set randomization seed
    -s, --secret-key <secretKey>     Secret key
    -R, --randomization-seed <seed>  Set randomization seed
    --recommended-order <bool>       Use recommended order
    -W --werror                      Cancel protection if any file contains errors
    --jscramblerVersion <version>    Use a specific Jscrambler version

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 Profile > API Credentials. In the examples these are shortened to AAAA and SSSS for the sake of readability.

Flag -W / --werror

Jscrambler by default will protect your application even if errors occurred in some of your files. For example: if your app have 5 files and 1 of them has syntax errors, Jscrambler will protect the files with no errors and keep the original content in the other one.

With this flag, any error/warning will make the protection fail. There are two possible types of errors:

  • Syntax errors


    function a[] {


    Error: "Unexpected token [" in test.js:1
    Protection failed
  • Errors parsing jscrambler code annotations


     //@jscrambler define __something
    function test() {
      return true;
    //@jscrambler [define xxxxx]
    function test1() {
      return false;


    Error: "[Annotation Error] Expected " " or [a-z]i but "_" found." in test.js:1
    Error: "[Annotation Error] Expected " ", "define", "disable", "enable", "global", "order" or "target" but "[" found." in test.js:8
    Error: "Parsing errors on annotations" in test.js
    Protection failed

Output to a single file

jscrambler -a AAAA -s SSSS -i APP_ID -o output.js input.js

Output multiple files to a directory

jscrambler -a AAAA -s SSSS -i APP_ID -o output/ input1.js input2.js

Using minimatch

jscrambler -a AAAA -s SSSS -i APP_ID -o output/ "lib/**/*.js"

Using configuration file

jscrambler -c config.json

where config.json is an object optionally containing any of the JScrambler options listed here, using the structure described in the RC configuration.

Enabling/disabling the recommended order

jscrambler --recommended-order false input1.js -o output/

To enable:

jscrambler --recommended-order true input1.js -o output/


npm install jscrambler

Quick example

var jscrambler = require('jscrambler').default;
  keys: {
  host: '',
  port: 443,
  applicationId: 'YOUR_APPLICATION_ID',
  filesSrc: [
  filesDest: '/path/to/destDir/',
  params: [  
      'name': 'whitespaceRemoval'
      'name': 'duplicateLiteralsRemoval'
.then(function () {
  console.log('All done!');
.catch(function (err) {

More detailed informations can be found here.

JScrambler Parameters

Please refer to docs for more information.