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JavaScript Obfuscator
Obfuscate JavaScript code to make it harder to read and reverse-engineer. Three levels — Light (minify only), Medium (rename variables), Heavy (encode strings). Runs entirely in your browser.
Level:
Paste JavaScript and click Obfuscate.
What is JavaScript Obfuscation?
JavaScript obfuscation transforms readable code into a functionally equivalent but difficult-to-understand version. Common techniques include variable renaming (replacing meaningful names with random strings), string encoding (converting literals to hex/unicode escapes), dead code injection, and control flow flattening. It is used to protect intellectual property and prevent easy copying of client-side logic.
Frequently Asked Questions
Yes. Since browsers must execute JavaScript, the code can always be deobfuscated with enough effort. Tools like de4js and browser DevTools can partially reverse obfuscation. Obfuscation raises the barrier but is not a substitute for server-side security.
Minification is universally recommended for production. Basic obfuscation adds overhead and can impact debugging. Most production deployments use a bundler (webpack, Rollup) with minification. Heavy obfuscation is typically only for commercial SDKs and DRM systems.
Minification removes whitespace and comments to reduce file size — the code stays readable. Obfuscation intentionally makes code hard to understand, often at the cost of larger size and worse performance.
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