JavaScript DeObfuscator & Beautifier
Instantly clean up, format, and make sense of ugly, minified, or obfuscated JavaScript code.
Unpack Code NowJavaScript Formatter
Paste your code below to unpack it and make it readable in seconds.
JavaScript DeObfuscator (Beautifier)
Why Use Our DeObfuscator?
Our tool provides a premium experience for cleaning and understanding complex JavaScript.
Powerful Formatting
Leverages the robust JS-Beautify library to intelligently format and indent your code.
Instant & Client-Side
Your code is processed instantly in your browser. Nothing is uploaded, ensuring speed and privacy.
Easy to Use
A simple interface lets you paste, click, and copy. No complex options or configurations needed.
How It Works
Making your code readable is a simple three-step process.
Paste Your Code
Copy your messy, minified, or packed JavaScript code into the input field.
Click the Button
Press the 'Unpack & Format' button to let the tool work its magic instantly.
Copy Your Result
Your clean, formatted, and readable code appears, ready to be copied and analyzed.
A Guide to JavaScript Obfuscation and Deobfuscation
Learn why code is obfuscated, common techniques, and how beautifiers help you make sense of it all.
What is JavaScript Obfuscation?
JavaScript obfuscation is the process of intentionally making source code difficult for humans to read and understand. While the code remains fully functional for the browser to execute, its logic, variable names, and structure are scrambled. This is different from encryption, which makes the code unusable until decrypted. Obfuscated code is still valid, executable JavaScript—it's just a mess.
Common Obfuscation Techniques
Developers use several techniques to obscure their code, often in combination:
- Minification: This is the simplest form. It removes all unnecessary characters like whitespace, line breaks, and comments. This reduces file size for faster loading but also makes the code a single, unreadable line.
- Variable Renaming: Descriptive variable names like
customerNameorcalculateTotalare replaced with short, meaningless names likea,b, or_0x2a1f. This is highly effective at hiding the code's intent. - String Encoding: Plain text strings are converted into other formats like hexadecimal or Base64, and then decoded at runtime. This hides URLs, messages, or keys within the code.
- Control Flow Flattening: The logical flow of the code is obscured by breaking it into small parts and placing them inside a large loop and a `switch` statement, making it extremely difficult to follow the execution path manually.
- Packing: The entire script is often compressed or packed into a single, dense string which is then unpacked and executed by a small loader function. A famous example is code packed with `eval(p,a,c,k,e,d)`.
What is Deobfuscation?
Deobfuscation is the reverse process: trying to make obfuscated code readable again. A "beautifier" or "formatter" is the first and most crucial tool in this process. Our tool acts as a powerful beautifier.
What our tool can do:
- Reverse Minification: It re-introduces proper indentation, spacing, and line breaks, transforming a one-liner back into a structured, readable format.
- Unpack Common Packers: It can often detect and automatically unpack scripts that have been compressed into formats like the `p,a,c,k,e,d` packer.
- Reveal Structure: By formatting the code correctly, it clearly shows the structure of loops, functions, and conditional statements, which is the first step to understanding its logic.
What beautifiers cannot do: A tool like this cannot magically recover the original variable and function names (e.g., turn `a` back into `customerName`). That information is permanently lost during the obfuscation process. True manual analysis is still required to fully understand heavily obfuscated code, but a beautifier makes that analysis possible.
Why Deobfuscate Code?
- Debugging: When working with third-party libraries that are only available in a minified version, a beautifier helps you debug issues by making the library's code readable in your browser's developer tools.
- Learning: It's a great way to study how complex web applications are built by looking at their formatted source code.
- Security Analysis: Security researchers use deobfuscators as the first step in analyzing suspicious or malicious scripts to understand what they do and how to defend against them.
Frequently Asked Questions
Find answers to common questions about our JavaScript DeObfuscator.
A JavaScript DeObfuscator, often called a beautifier or unpacker, takes complex, minified, or intentionally obscured JavaScript code and reformats it to be human-readable. It adds indentation, line breaks, and spacing to reveal the code's structure.
Yes, our JavaScript DeObfuscator and Beautifier is completely free to use for all your code analysis needs.
No. All deobfuscation and formatting happen locally in your browser using JavaScript. Your code is never transmitted to our servers, ensuring its complete privacy and security.
This tool is primarily a 'beautifier'. It excels at unpacking and formatting code that has been minified or packed with common techniques. However, it cannot reverse heavy obfuscation that involves renaming variables and functions to meaningless characters, as the original names are lost.
Simply paste your obfuscated or minified JavaScript code into the input text area and click the 'Unpack & Format' button. The readable, formatted code will appear in the output box below, ready to be copied.
Developers and security researchers often need to deobfuscate code to understand how a script works, to debug a minified library, or to analyze potentially malicious code found on a website.
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