JavaScript obfuscator

Protect your JavaScript at runtime.

JS-Reactor compiles your source into bytecode for a custom virtual machine embedded in the output script. Beautifiers and AST analyzers see the interpreter, not your original logic.

Launch Web IDE View features
100%
Offline capable
0
Runtime dependencies
AST
Driven transforms
VM
Bytecode interpreter

What JS-Reactor applies.

Each transform is independent and toggleable in the IDE. Enable what fits your threat model and skip what does not.

VM translation

Your logic is compiled to a custom bytecode and executed by an embedded interpreter. Beautifiers see the VM, not your code.

Control-flow flattening

Linear control flow is broken into small blocks and dispatched by a state machine. Loops, branches, and jumps become hard to tell apart.

String encryption

String literals are extracted, encrypted with rotating keys, and decrypted only at the moment they are used, defeating static string scraping.

Tamper and integrity checks

The VM verifies its own bytecode at runtime. If a byte is changed or interpreter functions are hooked, the script fails silently.

Offline CLI

Protection runs through a local command-line binary. No source is uploaded to a third-party service.

Optional transforms

Math obfuscation, dead-code injection, and minify are all toggleable in the IDE so you can trade output size against resistance.

Real input, real Max output.

Most JavaScript obfuscators rely on renaming variables and reformatting. Tools such as deobfuscator.io or js-beautify can reconstruct that kind of output. The sample below is a genuine JS-Reactor build with every protection enabled, generated from the seven-line input above it. The visible source is the VM interpreter and its data, not your algorithm.

input.js Readable source 
function calculateScore(level, bonus) {
    const base = level * 10;
    const total = base + bonus;
    return total;
}

const score = calculateScore(7, 25);
console.log("Final score: " + score);
Original script
protected.js Max protection 
(function(){try{Function("/*! JS Reactor | www.fireflyprotector.xyz */")}catch(_){}})();
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VM · control-flow flattening · string encryption · integrity · anti-debug · self-defending

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