JavaScript Deobfuscator - Deobfuscate JavaScript Code Online
Free online JavaScript deobfuscator tool to unminify and make obfuscated JavaScript code readable and easier to understand.
JavaScript Deobfuscator
Make obfuscated JavaScript readable
Input
Output
Deobfuscated JavaScript will appear here
Paste obfuscated code in the input area
How to Deobfuscate JavaScript - Step by Step Guide
Input Your Obfuscated JavaScript
Let's make your obfuscated JavaScript readable! You have several convenient options:
Example: Obfuscated JavaScript Input
Here's obfuscated JavaScript that's hard to read:
function _0x2a4b(_0x1c5d,_0x3e7f){if(_0x1c5d["\x6c\x65\x6e\x67\x74\x68"]<0x3)return![];return _0x3e7f["\x6c\x65\x6e\x67\x74\x68"]>=0x8;}
Automatic Deobfuscation & Formatting
The deobfuscator makes your code readable! The tool automatically applies multiple techniques:
Example: Deobfuscated Output
The same code, now deobfuscated and readable:
function _0x2a4b(_0x1c5d, _0x3e7f) { if (_0x1c5d["length"] < 3) { return false; } return _0x3e7f["length"] >= 8; }
Review and Understand the Code
Analyze the deobfuscated code with improved readability:
Export Deobfuscated Code
Save your readable JavaScript for analysis or documentation:
Frequently Asked Questions
What is JavaScript deobfuscation?
JavaScript deobfuscation is the process of converting obfuscated or minified code back into a more readable format. It includes beautifying the code structure, decoding encoded strings, and simplifying complex patterns to make the code easier to understand and analyze.
Can this tool fully recover original variable names?
No, deobfuscation cannot fully recover original variable and function names that were changed during obfuscation. However, it can decode string literals, improve code formatting, and make the logic easier to follow. Original names are permanently lost unless comments or hints remain in the code.
Is it legal to deobfuscate JavaScript code?
Deobfuscating code for learning, debugging your own code, or security research is generally legal. However, reverse engineering proprietary software to steal intellectual property or circumvent licensing may violate terms of service or copyright laws. Always respect software licenses and intellectual property rights.
Will deobfuscated code work the same as obfuscated code?
Yes, deobfuscation only improves readability without changing functionality. The code performs exactly the same operations. However, some obfuscated code includes anti-debugging or anti-tampering checks that may break if the code structure is modified.
Can I deobfuscate heavily obfuscated code?
The tool can handle various levels of obfuscation, including string encoding, minification, and basic transformations. However, heavily obfuscated code with advanced techniques may require multiple passes or manual analysis. The tool provides a good starting point for understanding complex obfuscated JavaScript.
Is the JavaScript deobfuscator completely free?
Yes, totally free with no limitations on file size or usage frequency. No registration required, and you can deobfuscate unlimited JavaScript files. All processing happens in your browser for privacy.