JSDefender

JSDefender

PreEmptive
+

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About

JS-Confuser is a powerful, open source JavaScript obfuscation tool that transforms your source code into a highly unreadable form, deterring reverse engineering, tampering, and unauthorized reuse while preserving full functionality. It offers multiple obfuscation techniques, including variable renaming, control flow flattening, string concealing, and function obfuscation, along with locks such as domain-based or date-based execution constraints and integrity checks to detect runtime modifications. Designed for flexibility, it provides obfuscation presets, ranging from 10 to 21+ transformation layers, and also allows fully customizable configurations to suit performance and protection needs. The tool operates entirely in the browser for fast, private obfuscation workflows, and includes advanced tooling features such as a playground for interactive experimentation, customizable options via JavaScript, integrated code prettification, and debugging support.

About

Cutting-edge JavaScript obfuscation techniques with control-flow flattening, tamper detection and other in-app protection transforms. We would not send our own unprotected code to a remote service controlled by third parties and we would not expect you to either. JSDefender supports major JavaScript frameworks, runtimes, and bundlers including Angular, Node, React, React Native, Webpack and others. Unlike languages like .NET and Java that are compiled to intermediate, stack-based assembly instructions before being distributed in binary form, JavaScript apps are typically distributed in source form. This means that your code is directly visible to anyone with access to the execution environment (like a browser). So, potential attackers can very easily step through the running code using a debugger built into their browser, or use other tools to statically analyze the code for vulnerabilities.

About

JavaScript is a scripting language and programming language for the web that enables developers to build dynamic elements on the web. Over 97% of the websites in the world use client-side JavaScript. JavaScript is one of the most important scripting languages on the web. Strings in JavaScript are contained within a pair of either single quotation marks '' or double quotation marks "". Both quotes represent Strings but be sure to choose one and STICK WITH IT. If you start with a single quote, you need to end with a single quote. There are pros and cons to using both IE single quotes tend to make it easier to write HTML within Javascript as you don’t have to escape the line with a double quote. Let’s say you’re trying to use quotation marks inside a string. You’ll need to use opposite quotation marks inside and outside of JavaScript single or double quotes.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Supported

Audience

Developers and teams wanting a tool to secure their JavaScript by transforming it into heavily obfuscated, self-defending code

Audience

IT teams in need of a professional-grade Application Protection solution

Audience

Web developers and anyone looking for a mobile solution for running and developing web content

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

API

Offers API Not Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Free Version Supported
Free Trial Not Supported

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

Free
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

JS-Confuser
United States
js-confuser.com

Company Information

PreEmptive
Founded: 1996
United States
www.preemptive.com/products/jsdefender/

Company Information

JavaScript
Founded: 1995
United States
javascript.com

Alternatives

JavaScript Obfuscator Pro

JavaScript Obfuscator Pro

JavaScript Obfuscator

Alternatives

Jscrambler

Jscrambler

4.4 out of 5 stars

Alternatives

AssemblyScript

AssemblyScript

The AssemblyScript Project
PrimeVeil

PrimeVeil

Covalence Systems
BlueClosure

BlueClosure

Minded Security
Dotfuscator

Dotfuscator

PreEmptive

Categories

Categories

Categories

Integrations

Benerator Not Supported
Claude Opus 5 Not Supported
CoffeeCup HTML Editor Not Supported
Easy Editor Not Supported
Ezumee Not Supported
GaiaNet Not Supported
Gemini 2.5 Pro Preview (I/O Edition) Not Supported
Gemini 3.5 Flash-Lite Not Supported
MirrorFly Not Supported
Refraction Not Supported
SAVVI AI Not Supported
Seald Not Supported
Second State Not Supported
Serply Not Supported
Slater Not Supported
Speed Not Supported
SpellBox Not Supported
TTerm Connect Not Supported
TeleportHQ Not Supported
Unified.to Not Supported

Integrations

Benerator Not Supported
Claude Opus 5 Not Supported
CoffeeCup HTML Editor Not Supported
Easy Editor Not Supported
Ezumee Not Supported
GaiaNet Not Supported
Gemini 2.5 Pro Preview (I/O Edition) Not Supported
Gemini 3.5 Flash-Lite Not Supported
MirrorFly Not Supported
Refraction Not Supported
SAVVI AI Not Supported
Seald Not Supported
Second State Not Supported
Serply Not Supported
Slater Not Supported
Speed Not Supported
SpellBox Not Supported
TTerm Connect Not Supported
TeleportHQ Not Supported
Unified.to Not Supported

Integrations

Benerator Supported
Claude Opus 5 Supported
CoffeeCup HTML Editor Supported
Easy Editor Supported
Ezumee Supported
GaiaNet Supported
Gemini 2.5 Pro Preview (I/O Edition) Supported
Gemini 3.5 Flash-Lite Supported
MirrorFly Supported
Refraction Supported
SAVVI AI Supported
Seald Supported
Second State Supported
Serply Supported
Slater Supported
Speed Supported
SpellBox Supported
TTerm Connect Supported
TeleportHQ Supported
Unified.to Supported
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