PreEmptive logo

JSDefender: A Professional-Grade
JavaScript Obfuscator

Professional-grade obfuscation and in-app protection for over 20 years!

Every app needs security measures to protect its users and code—that goes double for JavaScript-based applications. Without proper protection, your app could be at risk of tampering, misuse, data theft, intellectual property infringement, and more.

JavaScript applications distribute code in source form, making them vulnerable to reverse engineering, tampering, and IP theft. JSDefender provides professional-grade obfuscation that renders your code incomprehensible to decompilers while maintaining full functionality.
Supports React, Angular, Vue, Node.js, and all major JavaScript frameworks
JSDefender for JavaScript demo on laptop image

The Global Standard for In-App Protection

80% of Fortune 500 Dev Teams and Developers Use PreEmptive Dotfuscation!

JavaScript Security Threats, JSDefender Prevents:

Languages like .NET and Java are compiled to intermediate, stack-based assembly instructions before your app distributes them in a binary. Apps using JavaScript, on the other hand, distribute their code in source form.

As a result, your code is directly visible to anyone who has access to a browser or app. Therefore, potential hackers can easily use a debugger or decompiler to spot vulnerabilities in your code and use them to their advantage.

Reverse Engineering

Reverse engineering icon

Tampering

Tampering icon

Unauthorized Debugging

Unauthorized debugging icon

JSDefender's Multi-Layer Obfuscation Process

Our layered approach to JavaScript hardening provides multiple layers of protection for your application. Some of the elements we use to layer your application’s security include:
How Does JavaScript Obfuscation with JSDefender Work
Start Your Free Trial Today!

What Obfuscated JavaScript Looks Like

When you use JSDefender to obfuscate your JS code, your code immediately becomes incomprehensible to decompiling tools. Here’s what JavaScript with obfuscated code looks like.
Before
After

How to Obfuscate JavaScript with JSDefender

With as many options as the tool has for obfuscating your JavaScript code, JSDefender has hundreds of possible combinations you can use to protect your work. All you have to do is open a command line and start up JSDefender.

From there, JSDefender helps you to scramble and obfuscate the most vulnerable parts of your code, preventing bad actors from being able to tamper with it.

Try our free online obfuscation tool to get a taste of how the program can work for yourself!

Before and after rename obfuscation example image

Want to See JSDefender in Action?

Here’s a video with a quick overview of how JSDefender works as a code obfuscation tool. Our customer success expert Mike walks through how to use the tool using PacMan as his test subject.

Try for Free Today

JSDefender delivers robust, multi-layered code protection and expert support for all major JavaScript frameworks.

Start your free trial today and experience watertight security for your applications.