Tool Overview

This code obfuscator takes readable JavaScript or TypeScript code and transforms it into a much harder to read version while keeping the same behavior. It uses a client side obfuscation library to change identifiers, alter structure, and add protection tricks. The goal is to slow down people who try to copy, debug, or reverse engineer your logic from the browser.

The problem it solves is simple. Source code sent to the browser is plain text. Anyone can open the developer tools, read the functions, and copy business logic. Manual tricks such as renaming a few variables are not enough. You need a repeatable way to apply advanced transformations like control flow flattening, string array usage, and dead code injection. This tool wraps those features in a safe, guided interface.

This tool is mainly for technical users and professionals. Frontend developers, library authors, and product teams can use it to protect critical parts of their client side code. Security minded users can combine it with other controls such as code splitting and server side logic. While a beginner can learn the basics of obfuscation here, the main audience is people who already write and ship JavaScript or TypeScript code.

Background & Concept Explanation

Code obfuscation is the process of transforming source code into a form that is difficult for humans to understand while keeping its original behavior. It is widely used when source code is shipped to users, such as in web apps, browser extensions, or desktop clients built on web technologies. The goal is not perfect security, but to raise the cost of reverse engineering.

In JavaScript, obfuscation often includes renaming variables and functions to short, meaningless names, hiding strings in arrays, flattening control flow, and injecting extra code paths that never actually run. These changes confuse both casual readers and many static analysis tools. They also make it much harder to identify which parts of the code base implement key business rules.

Without a tool, doing this by hand is extremely hard. You would need to rename every identifier, update all references, and ensure you do not break scope rules. You would have to invent confusing logic and dead branches that still type check and run. One mistake can break the program completely. Manual obfuscation does not scale to real projects.

This tool loads a dedicated obfuscation library into the browser. The library receives your code and an options object. Based on the options, it rewrites your code into a different program that behaves the same but has a much less obvious structure. The app also measures how the size changes and can ask an AI assistant to review the before and after versions.

Key Features

• Three obfuscation levels. You can choose LIGHT, MEDIUM, or STRONG. Each level maps to a set of options inside the obfuscation engine. LIGHT keeps things simpler and faster. STRONG enables more aggressive transformations such as full control flow flattening, high dead code injection, debug protection, console disabling, string array encoding, and Unicode escape sequences. This matters because different projects need different trade offs between protection, size, and performance.
• Client side obfuscation library loading. The app dynamically loads a JavaScript obfuscation library from a content delivery network when the page opens. It checks when the global object is ready and shows user friendly errors if loading fails. This allows the UI to stay lightweight while still using a powerful engine.
• Source code input panel. You can paste or type original JavaScript or TypeScript code into a full height editor area. The editor is a simple textarea with a monospaced theme so that code is easy to read. This panel is the only place where you edit your original code in the tool.
• Side by side view of original and obfuscated code. On larger screens, the tool shows two panels next to each other. The left side is the original source. The right side is the resulting obfuscated output. This direct comparison makes it easier to evaluate obfuscation strength and check for obvious issues.
• Mobile friendly tab switcher. On small screens, the layout shifts to a single panel at a time. Tabs labeled Source and Obfuscated let you switch between the two views. This keeps the interface usable on phones without dropping any features.
• File upload support with size limits. You can load code from a local file using the upload button. The tool accepts .js, .jsx, .ts, and .tsx files. It enforces a maximum file size of about 2MB both on file size and on text length. If the file is too large, you receive a clear error message and the file input resets.
• Reusable sample code. A sample button loads a realistic block of code that includes authentication flow, token generation, form validation, data processing, event handling, network calls, and statistics. This lets you quickly see what obfuscation does to non trivial code without needing your own project.
• Clipboard integration for both panels. Each code panel has a copy button. Clicking it uses the browser clipboard API to copy the current content. If the copy fails, the tool shows a small error message. This makes it easy to reuse obfuscated code in your build system.
• Download obfuscated code as a file. For the obfuscated panel, you can click a download button. The tool wraps the code in a Blob and offers it as a JavaScript file, named obfuscated.js by default. This is very useful when you want to store the result or ship it manually.
• Size statistics after obfuscation. After a run, the tool calculates original size and obfuscated size in bytes, converts them to kilobytes, and computes the percentage change. A small stats card shows the final size and a percentage like +10.5% or -5.2%. This helps you understand the impact of different obfuscation levels on bundle size.
• AI security analysis. Once you have a result, you can ask for an AI driven security audit. The tool sends both original and obfuscated code to a backend service. The AI returns a summary, a list of protections it detects, and a list of recommendations. These appear in a dedicated panel with badges and bullet points.
• Robust error handling and messages. The tool wraps all heavy operations in try and catch blocks. It validates input length and library availability before starting. Common issues such as syntax errors, library loading failure, or oversized outputs produce specific error messages that appear in a persistent banner at the top.

Common Use Cases

A frontend team might paste their login and session management code into the tool. They choose MEDIUM or STRONG obfuscation to make it harder for attackers to see how tokens are generated and stored. They then copy the obfuscated version into a separate build step or into a script tag in their app shell.

A library author could take the part of their client side package that implements custom algorithms and run it through LIGHT obfuscation. This level keeps size growth modest while still hiding function and variable names. The rest of the library might remain unobfuscated for easier debugging.

A security engineer can evaluate how well obfuscation hides sensitive patterns. They can run sample code that includes obvious security smells, obfuscate it at different levels, and then inspect both the output and the AI report. This helps them judge whether the current settings are strong enough for their risk profile.

A teacher or trainer can use the built in sample code and obfuscation levels as part of a workshop on client side security. Students can see original and obfuscated versions side by side, learn which features are applied, and read the AI recommendations.

Developers working on browser extensions can use the tool to obfuscate parts of their content scripts before packaging. They then download the obfuscated file and include it in the extension bundle while leaving configuration files and manifest readable.

How to Use This Tool (Step-by-Step)

1. Open the code obfuscator interface. You will see a top bar, a controls bar with obfuscation level buttons and an Obfuscate button, and two large code panels for source and output.
2. Decide how to load your code. You can either paste or type it directly into the Original Code panel, use the upload icon to select a .js, .jsx, .ts, or .tsx file, or click the Sample button to load the prepared example. For a new user, starting with the sample is a good way to explore.
3. Review the selected obfuscation level in the controls bar. LIGHT focuses on compact code with string array usage but no heavy control flow changes. MEDIUM adds control flow flattening and dead code injection with moderate thresholds. STRONG enables full control flow flattening, maximum dead code, debug protection, disabling console output, string array encoding with base64, Unicode escape sequences, and disables simplification.
4. Adjust the level as needed by clicking the corresponding button. The active level is highlighted with a white background and colored text. The others appear as simple gray text buttons.
5. Check that the obfuscation library is loaded. If the Obfuscate button shows “Loading...” with a spinner, wait until it switches to the normal label. If the library fails to load, you will see an error message at the top telling you to refresh or check your connection.
6. Click the Obfuscate button when your code is ready. The tool clears any previous result and AI report, sets a processing state, and then calls the obfuscation service. While it runs, a spinner and “Processing...” text appear on the button.
7. Wait for the obfuscated code to appear in the Obfuscated Code panel. On desktop, it appears on the right side. On mobile, the interface may switch automatically to the Obfuscated tab. If there is an error, read the message in the red banner and fix the problem, such as syntax errors or size limits.
8. Review the stats section below. Look at the size change percentage and final size in kilobytes. If the change is very large, you may want to try LIGHT or MEDIUM instead of STRONG to reduce bundle impact.
9. If you want a deeper review, click the Analyze button in the Security Analysis card. The tool sends both the original and obfuscated code to the AI backend. While it runs, you will see a small bouncing loader and a short message.
10. Once the AI analysis is ready, read the summary, scan the list of protection techniques it detects, and review the recommendations. Use these insights to decide if you should adjust your obfuscation level or combine it with other security practices.
11. When you are satisfied with the result, use the Copy button in the Obfuscated Code panel to copy the entire output or click Download to save it as a file. Paste or place this code into your build pipeline, script tags, or extension bundle as needed.
12. If you want to start over, click the Clear button in the top bar. This removes both original and obfuscated code, resets AI results, and clears any errors.

Calculations & Logic

At the core, the tool sends your code string and an options object to the obfuscation library. Before that, it enforces several checks. It verifies that the input is a non empty string and trims it. It enforces a maximum input length of about 2MB characters, and if this limit is exceeded it throws a size error instead of trying to process the code.

For light obfuscation, the options enable compact output, string array features, and some simplification while disabling heavy features like control flow flattening and dead code injection. For medium obfuscation, control flow flattening is enabled with a threshold of 0.5, and dead code injection with a threshold of 0.4, plus the string array remains active. For strong obfuscation, the thresholds are set to 1, debug protection and its interval are enabled, console output is disabled, string array encoding uses base64, the threshold is set to 1, Unicode escape sequences are enabled, and simplification is turned off.

The obfuscator returns an object with a method getObfuscatedCode. The tool calls this method to get the final string. It guards against invalid responses and missing output and throws a specific error if something is wrong. It then checks the length of the obfuscated code against a maximum output limit of about 10MB. This protects the browser from extremely large results.

To compute size statistics, the tool uses Blob objects to measure bytes rather than relying on string length alone. It builds two blobs: one from the original code and one from the obfuscated code. It reads their size properties, then calculates the relative change as ((newSize - originalSize) / originalSize) * 100. This value is formatted to one decimal place and prefixed with a plus sign if positive.

When you request an AI security audit, the tool first checks that both the original and obfuscated code are non empty and under 50KB in length. It then calls a backend helper that wraps the AI service. The backend returns a structured report with a summary, a list of protections, and a list of recommendations. The tool validates this structure before displaying it.

Reference Tables or Scales

Tips, Limitations & Best Practices

Remember that obfuscation is a layer of defense, not a perfect shield. Determined attackers with time and tools can still analyze obfuscated code. Always keep truly sensitive logic, secrets, and keys on the server side where users cannot access them directly.

Choose LIGHT or MEDIUM for large applications where bundle size and performance are important. These levels still rename identifiers and confuse structure without adding as much dead code or heavy control flow tricks. Use STRONG only on focused sections of code that justify higher overhead.

Always test obfuscated code in a safe environment before pushing it to production. Because obfuscation changes structure deeply, you should run your normal test suite and manual checks to make sure behavior did not change. Pay special attention to timing sensitive code and integration with third party scripts.

Use the built in sample code to understand how different levels behave before obfuscating your own project. This lets you see how loops, async functions, DOM event handlers, and utility functions look when transformed.

Watch the size statistics after each run. If you see a very large positive percentage change, consider lowering the level or excluding some code from obfuscation. Very large obfuscated bundles can slow down downloads and parsing.

Keep input size under the limits. The tool refuses to process files larger than about 2MB and will not request AI analysis for code larger than 50KB. If your project is bigger, consider obfuscating only specific modules or splitting the code into smaller parts.

Use the AI security report as guidance. The summary and recommendations can point out missing protections or possible improvements. However, treat it as advice, not as a strict checklist. Always combine it with your own security review.

Avoid obfuscating code that is meant to be open for learning, such as tutorials or open source examples. Obfuscation makes code hard to understand for everyone, including legitimate users and collaborators.

Finally, document in your team when and how you use obfuscation. Track which parts of the code base are obfuscated and at which level, so that future maintainers know where to expect unreadable code in production bundles.