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Obfuscate JavaScript code for protection (legal purposes only)
Obfuscate JavaScript code instantly with our free online JavaScript obfuscator. This tool helps developers protect JavaScript code by making it harder to read and reverse engineer. Simply paste your JavaScript and get obfuscated code in real-time.
This tool is intended for code protection purposes only. Do not use for malicious purposes, hiding malware, or any illegal activities. Use responsibly and ethically.
This is a simplified obfuscator. For production use, consider using thejavascript-obfuscatorpackage which provides advanced obfuscation features.
Replace variable names with meaningless identifiers
Encode strings using Base64 to hide string literals
Transform control flow to make code harder to understand
Remove unnecessary whitespace and format code in one line
Code obfuscation makes JavaScript harder to read and understand, providing a basic level of protection for your intellectual property.
Important Notes:
JavaScript obfuscator transforms readable JavaScript code into functionally equivalent but difficult-to-understand code. Used for protecting intellectual property, preventing casual code theft, and hiding implementation details.
Parse JavaScript into AST (Abstract Syntax Tree), apply transformations: rename variables/functions to meaningless names, convert strings to encoded forms, add dead code, flatten control flow, encode numbers, then regenerate code from modified AST.
Techniques: identifier renaming (a, b, c or hex), string encoding (hex, unicode, base64), control flow flattening, dead code injection, self-defending code, debug protection. Tools: javascript-obfuscator, terser, UglifyJS. Note: obfuscation ≠ encryption.
Make algorithms harder to copy.
Proprietary business logicObscure license checking code.
Detect and prevent code modification.
Deter script kiddies from copying.
// Before obfuscation
function calculateDiscount(price, percentage) {
const discount = price * (percentage / 100);
const finalPrice = price - discount;
return finalPrice;
}
const result = calculateDiscount(100, 15);
console.log('Final price:', result);
// After obfuscation (example output)
var _0x4a2f=['log','Final\x20price:'];
(function(_0x2d8f05,_0x4a2fcd){
var _0x5a8c01=function(_0x594b5e){
while(--_0x594b5e){
_0x2d8f05['push'](_0x2d8f05['shift']());
}
};
_0x5a8c01(++_0x4a2fcd);
}(_0x4a2f,0x1e3));
var _0x5a8c=function(_0x2d8f05,_0x4a2fcd){
_0x2d8f05=_0x2d8f05-0x0;
var _0x5a8c01=_0x4a2f[_0x2d8f05];
return _0x5a8c01;
};
function _0x594b5e(_0x1a2b3c,_0x4d5e6f){
var _0x7a8b9c=_0x1a2b3c*(_0x4d5e6f/0x64);
var _0x2c3d4e=_0x1a2b3c-_0x7a8b9c;
return _0x2c3d4e;
}
var _0xresult=_0x594b5e(0x64,0xf);
console[_0x5a8c('0x0')](_0x5a8c('0x1'),_0xresult);Obfuscation makes code hard to read but functionally equivalent. Variable names, strings, and control flow are transformed.
Use JavaScript obfuscator to protect proprietary algorithms, deter casual code copying, or add a layer of difficulty for reverse engineering. Never rely on it for security.
No. Obfuscation is security through obscurity. Determined attackers can reverse-engineer with time. It increases effort but doesn't prevent access. Don't obfuscate secrets (API keys, passwords).
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