JavaScript Obfuscation Tool

Instructions

Select Obfuscation Mode

Choose between simple, medium, or heavy obfuscation modes as needed.

Configure Options

Enable or disable various obfuscation options as needed.

Provide Source Code

Upload a JavaScript file or enter code directly in the text box.

Execute Obfuscation

Click the "Obfuscate Code" button to start processing.

Get Results

After processing, you can view, copy, or download the obfuscated code.

JavaScript混淆基本知识

What is JavaScript Obfuscation

JavaScript obfuscation is a technique that transforms readable JavaScript code into a functionally equivalent but difficult to read, understand, and reverse-engineer form. Obfuscated code retains its original functionality, but variable names, function names, and structure are converted into more complex or unintuitive forms.

Essence of obfuscation: Increase the complexity and unintelligibility of code without changing its functionality, thereby achieving the purpose of protecting source code.

JavaScript Obfuscation Benefits and Purposes

Intellectual Property Protection
Prevent others from easily copying or modifying your JavaScript code logic
Prevent Code Analysis
Increase the difficulty for competitors or malicious users to analyze and understand your code
Protect Business Secrets
Hide sensitive information such as algorithms, API keys, and business logic
Code Optimization
Some obfuscation techniques can reduce file size and improve loading speed

Common JavaScript Obfuscation Techniques

Variable/Function Name Obfuscation

Replace meaningful variable names, function names, and parameter names with meaningless short names or random characters

Code Compression

Remove spaces, comments, and line breaks, merge variable declarations, shorten property access paths

Control Flow Flattening

Convert simple control flow into complex conditional jumps and loops, making code logic difficult to track

String Encryption

Encrypt string constants in code and decrypt them dynamically during runtime

Obfuscation Levels and Performance Impact

Obfuscation Level	Protection Level	Code Size	Runtime Performance	Use Cases
Simple Obfuscation	Low	Reduced (10-20%)	Almost no impact	General websites, performance-focused
Medium Obfuscation	Medium	May increase (10-30%)	Slight impact	Most web applications
Heavy Obfuscation	High	Significantly increases (30-100%)	Noticeable impact	Core algorithms, high-value code

Limitations of JavaScript Obfuscation

Cannot Completely Prevent Reverse Engineering
Obfuscated code can still be analyzed by experienced developers, though it increases the difficulty
May Impact Performance
Advanced obfuscation techniques may cause decreased code execution speed and increased memory usage
Difficult to Debug
Obfuscated code is difficult to debug and maintain; keep unobfuscated source code
May Increase File Size
Some obfuscation techniques (like self-defending) increase code size, affecting loading speed

Tip: Obfuscation is just the first line of defense for code protection. For highly sensitive code, it's recommended to combine with server-side processing, code splitting, and other security measures.