# Peeling Back the Layers: Unmasking Hidden Secrets in JavaScript Code

Hey there! Today, let's go on a little adventure into the world of website secrets. Imagine this: if you add **?\_debug=1** to the end of a JavaScript(.js) page's address, it's like unlocking a hidden door. We'll explore a cool security trick that makes a regular web address spill the beans on hidden comments and cool stuff.

### **The Hacker's Arsenal: ?\_debug=1 Unleashed -**

Imagine stumbling upon a URL like [`https://test.com/dist/js/validate.js?_debug=1`](http://test.com/dist/js/validate.js?_debug=1). A harmless-looking query parameter, right? Yet, when injected with this unsuspecting flag, the JavaScript file eagerly exposes its hidden comments and debugging artifacts.

In the below image, you can see how a normal .js file looks when visited.

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1699865245791/d0871c8b-1df3-42db-a3e5-bb2eaf6b582e.png?auto=compress,format&format=webp align="left")

Now let's add `?_debug=1` at the end of the URL.

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1699865315202/ba12857c-cfb0-488b-8c61-ed04ba552f03.png?auto=compress,format&format=webp align="left")

You'll notice that the JavaScript file reveals hidden comments.

*(****\*\*Note*** *\- This may not work consistently. My hunch is that it should work when the debugging mode is turned on in the JavaScript file.)*

### **The Unseen Risks**

From a hacker's perspective, these hidden comments can be a gateway to understanding the inner workings of an application. It may reveal APIs, authentication mechanisms, or other delicate details, turning what seems like harmless information into a potential roadmap for an attack.

### **Mitigating the Risk: A Call to Action**

1. **Code Sanitization:** Developers, let's adopt a meticulous approach to code sanitization. Strip away unnecessary comments and debugging artifacts before deploying code to production.
    
2. **Server Configuration:** Configure servers to disregard debugging flags or query parameters in production environments. Limit access to sensitive files and directories.
    
3. **Educating Developers:** Developers, remain vigilant. Understand the potential risks associated with n comments and encourage best practices for secure coding within your teams.