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How to Deobfuscate JavaScript - Step by Step Guide

Step 1

Input Your Obfuscated JavaScript

Let's make your obfuscated JavaScript readable! You have several convenient options:

•
Paste directly: Copy your obfuscated or minified JavaScript and paste it into the input editor
•
Upload a file: Click "Upload" to select an obfuscated .js file from your computer
•
Try the sample: Click "Sample" to see how deobfuscation works

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;}
Step 2

Automatic Deobfuscation & Formatting

The deobfuscator makes your code readable! The tool automatically applies multiple techniques:

•
Beautifies code: Adds proper indentation and line breaks for readability
•
Decodes strings: Converts hex-encoded and base64 strings back to readable text
•
Simplifies structure: Removes unnecessary complexity where possible

Example: Deobfuscated Output

The same code, now deobfuscated and readable:

function _0x2a4b(_0x1c5d, _0x3e7f) {
  if (_0x1c5d["length"] < 3) {
    return false;
  }
  return _0x3e7f["length"] >= 8;
}
Step 3

Review and Understand the Code

Analyze the deobfuscated code with improved readability:

•
Syntax highlighting: Color-coded output makes code structure clear
•
Line numbers: Easy navigation and reference to specific code sections
•
Proper structure: Indentation shows function nesting and code flow
Step 4

Export Deobfuscated Code

Save your readable JavaScript for analysis or documentation:

•
Copy to clipboard: One-click copying for easy use in your projects
•
Download as file: Save deobfuscated code as a .js file
•
Further beautify: Use with our JavaScript Beautifier for additional formatting

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.