Code Obfuscation of Javascript code using JScrambler
Tags: javascript, react, code, obfuscation
Published: 2023-07-09 06:16:50

**What is code obfuscation?**
Code obfuscation is the process of modifying the source code of a program to make it difficult to understand and analyze, while preserving its functionality. In the case of JavaScript, obfuscation is often used to protect sensitive information or intellectual property, as well as to make it harder for attackers to reverse engineer or exploit the code.

There are different techniques used for code obfuscation and few were stated below,

**Variable and Function Renaming**
One of the simplest techniques is to rename variables and functions to meaningless or randomly generated names. This makes the code harder to understand and follow.

**String Encryption**
Encrypting strings within the code and dynamically decrypting them at runtime can make it difficult for an attacker to extract sensitive information from the code.

**Code Splitting**
Breaking up the code into multiple parts and dynamically loading them at runtime can make it harder for someone to understand the overall flow of the program.

**Code Transformation **
Transforming the code structure, such as changing the order of statements, adding redundant code, or using complex control flow constructs, can make the code more convoluted and challenging to comprehend.

**Removing Whitespace and Comments**
Stripping out unnecessary whitespace and comments can make the code more compact and harder to read, although this is more of a basic obfuscation technique.

It's important to note that code obfuscation is not a foolproof security measure. A determined attacker can still reverse engineer or analyze the obfuscated code given enough time and effort. However, obfuscation can act as a deterrent and make it more time-consuming for an attacker to understand the code.

There are several JavaScript obfuscation tools available that automate these techniques. Some popular ones **JS Defender**, **JScrambler** and **Appdome**. These tools can help streamline the obfuscation process and generate obfuscated versions of your JavaScript code.

Here I have used Jscrambler for the understanding of engineering and limitation of obfuscating the code.

Sign in and create the dashboard on the jscrambler by connecting your Demo app. I have used this link to create the sample project and connect the code with Jscrambler dashboard.

Make sure you have configure the token generated from the dashboard should be linked with the app config file to have proper connection with the dashboard.

To confirm the connection, execute the following command and see the console.

`Jscrambler`

Once all the connection is completed, we were able to see the app name in the dashboard with the code from js file.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/sdeqwzsrde126wpf2ywb.png)

Now we have to choose the options from the dashboard for obfuscation, As am using the trial version of jscrambler, we can obfuscate only the variable name.

In the below screenshot you can see the obfuscation of variable name.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/cty4nzdlrtu8q12cmmyf.png)


Note: We have tried using the code obfuscation tool for react native and react js. But there is some limitation in obfuscating the JSX code. 

Thanks for Reading,

Happy coding.....!