BYTEHIDE SHIELD FOR TYPESCRIPT
TypeScript Obfuscator
Protect your TypeScript project against reverse engineering, copying, and tampering. ByteHide Shield obfuscates the compiled output of your TypeScript, built into your pipeline.
Get started
Webpack
npm install --save-dev @bytehide/webpack-shieldAdd Shield to your Webpack config. It protects the compiled output after TypeScript builds.
Full setup guide in the docsVite
npm install --save-dev @bytehide/vite-shieldAdd the Shield plugin to vite.config. It protects every production build.
Full setup guide in the docsCLI
npm install -g @bytehide/shield-cli
tsc
shield protect "dist/**/*.js"Compile your TypeScript, then protect the output with one command.
Full setup guide in the docsFree to use with a ByteHide account
The first time Shield runs, it asks for a project token that connects it to your account. The package is free.
Get your free tokenHow it works
How to obfuscate a TypeScript project
TypeScript compiles to JavaScript before it runs. Shield protects that compiled output. Here is how it works in three steps.
Step 01
Install the Shield package for your build
Add the ByteHide package for your bundler, Webpack or Vite, or use the CLI. It installs as a dev dependency in your project.
Step 02
Add your project token
Create a free ByteHide account to get your project token, and add it to the plugin configuration. The token connects Shield to your account.
Step 03
Build as usual
Run your normal build. TypeScript compiles, the bundler bundles, and Shield protects the output automatically. Every release ships obfuscated.
Why obfuscate
Why obfuscate TypeScript code
TypeScript compiles to JavaScript before it reaches the browser. Whatever you ship is readable, and the structure your types describe so clearly is just as clear to anyone reading the compiled output.
- Your types document your logicInterfaces and type definitions make your code easy to understand. That clarity helps your team, and it helps an attacker reading the compiled JavaScript just as much. Obfuscation removes that readability from the shipped code.
- Compiled TypeScript still ships to the clientType checking happens at build time, but the JavaScript that results is what runs in the browser, in plain sight. Obfuscation protects that output.
- Source maps can expose your original codeA misconfigured build can ship source maps that reveal your original TypeScript, names and all. Obfuscation, plus disabling production source maps, closes that gap.
Example
See TypeScript obfuscation in action
Obfuscation is easier to understand when you see it. Here is a small piece of TypeScript before and after Shield protects the compiled output.
interface License {
key: string;
isValid(): boolean;
}
class LicenseChecker implements License {
constructor(public key: string) {}
isValid(): boolean {
return this.key === 'ByteH1de!2026';
}
}
const checker = new LicenseChecker('ByteH1de!2026');
console.log(checker.isValid());var _0xa1=['c7f2','9d3a','b14e'];function _0x1b(b){var _s=0;while(1)switch(_s){
case 0: _0xa1[1]=_dec(0x12); _s=1; break;
case 1: return b===_0xa1[0];
}}var _0x2c=function(d){this.k=_0x1b(_dec(0x3f));};
_0x2c.prototype._0x4e=function(){return _0x1b(this.k);};
(new _0x2c())._0x4e();Same behavior, unreadable result. The compiled output reveals nothing about your original types or logic.
What it covers
What ByteHide Shield protects in your TypeScript build
Shield applies its protection to the JavaScript your TypeScript compiles to. Here is what that covers.
- Your compiled logicThe functions, classes, and algorithms from your TypeScript become unreadable in the shipped output. The behavior is identical, the logic is not legible.
- Your strings and constantsAPI endpoints, keys, messages, and configuration values are encrypted, so they cannot be read by scanning the compiled file.
- Your control flowThe structure of your logic is reshaped so the program flow cannot be followed, even after the code is beautified.
- Your whole project, every buildProtection runs as part of your pipeline, so every release ships obfuscated automatically. There is no manual step to forget.
Type checking protects you at build time. Shield protects what you ship.
Source maps
TypeScript obfuscation and source maps
Source maps are one of the most common ways a protected TypeScript project leaks its original code. Understanding them is part of obfuscating TypeScript properly.
- What a source map isA source map links your compiled JavaScript back to your original TypeScript, so browser developer tools can show readable code while debugging. It is useful in development, and a liability in production.
- Why a production source map undoes your obfuscationIf your build ships a source map to production, anyone can open developer tools and read your original TypeScript, with your real names, types, and structure. The obfuscation of the compiled file no longer matters, because the map hands over the source.
- How to obfuscate TypeScript safelyDisable source map generation for production builds, or keep source maps private and never deploy them. Then apply Shield to the compiled output. The shipped JavaScript is obfuscated, and there is no map back to the original.
Obfuscation and source map hygiene work together. One without the other leaves a gap.
Free tool vs Shield
Free obfuscator vs ByteHide Shield
For a quick test of a single JavaScript file, the free online obfuscator is enough. For a real TypeScript project, ByteHide Shield protects the whole build.
ByteHide Shield
Production-grade protection
The free online tool obfuscates single JavaScript files. ByteHide Shield protects a full TypeScript project, built into your pipeline.
Open the free JavaScript obfuscatorFrequently asked questions
What is a TypeScript obfuscator?
Can I obfuscate TypeScript directly?
How do I add ByteHide Shield to a TypeScript project?
Is it free?
Will obfuscation affect my application performance?
Can obfuscated TypeScript be reversed?
What is the best TypeScript obfuscator?
Protect your TypeScript project with
ByteHide Shield
Obfuscation is one layer. ByteHide Shield adds code virtualization, runtime self-protection, and advanced configuration, built into your TypeScript pipeline.
