Javascript Deobfuscator

Decode and Analyze Complex Scripts

Obfuscation techniques—like hex encoding, packing, and minification—are often used to hide the true intent of a script. Whether you are a security researcher analyzing potential malware or a developer debugging a legacy system without source maps, reading raw obfuscated code is impossible.

Our JavaScript Deobfuscator transforms these unintelligible blocks of text into structured, indented, and readable code. By applying intelligent formatting and unescaping strings, it exposes the control flow and logic, allowing you to trace execution paths and understand the script's behavior.

How to Deobfuscate Code

1. Input: Paste the raw, obfuscated string into the editor.
2. Settings: Choose your indentation preference (2 spaces is standard for deep nesting).
3. Execute: Click "Deobfuscate JS" to unpack and format the code immediately.

Frequently Asked Questions

What is JavaScript deobfuscation?

Deobfuscation is the reverse engineering process of converting difficult-to-read (obfuscated) code back into a understandable format. It reveals the code's structure and logic, which were intentionally hidden to protect intellectual property or conceal malicious behavior.

How do you un-obfuscate JavaScript code?

The most efficient method is using an automated deobfuscator. This tool parses the messy string, applies syntax highlighting, inserts proper line breaks, and decodes escaped characters to restore visual hierarchy and readability.

Can all obfuscated JavaScript be reversed?

You can always restore the structure (readability), but you cannot recover original data lost during obfuscation, such as specific variable names or comments. The logic becomes clear, but the context provided by naming conventions remains lost.

What is the difference between a deobfuscator and a beautifier?

A beautifier purely handles formatting (indentation and spacing). A deobfuscator goes a step further by attempting to decode packed data, unescape strings, and simplify syntax to make the actual logic more apparent, not just the layout.

Is it legal to deobfuscate JavaScript?

Generally, yes, for purposes of security research, debugging, or interoperability. However, using deobfuscation to bypass licensing, steal proprietary algorithms, or violate Terms of Service is illegal.