JS-Confuser is a free, open-source JavaScript obfuscator that makes code harder to read, copy, reuse, or modify while seeking to preserve its functionality. Its browser playground lets users paste JavaScript, adjust settings, run obfuscation, and download the result; processing remains in the browser even offline, and the maker says code and actions are not sent to a remote server. Users can choose Low, Medium, or High presets or create configurations. Options include variable renaming, string concealing, control-flow flattening, dead-code insertion, domain and date locks, and tamper protection. The API provides JSConfuser.obfuscate for source code and JSConfuser.obfuscateAST for Babel ASTs. The editor targets Browser or Node.js output and includes Prettier and editable JSON settings. Obfuscation may increase file size and performance overhead or break a program. It does not prevent determined reverse engineers from recovering code or sensitive information. Tamper protection requires eval and non-strict mode, may break code, and must be enabled manually.
Who it is for
It suits developers who want to make JavaScript harder to inspect or reuse, either through the browser playground or the programming API. Users needing tamper protection should account for its runtime requirements and possible code breakage.
What is good
- Free and open source.
- Playground runs offline in the browser.
- Offers Low, Medium, and High presets.
- API supports source code and Babel ASTs.
What to know first
- Obfuscation can increase file size and performance overhead.
- Obfuscation may break a program.
- Determined reverse engineers may recover code or sensitive information.
- Tamper protection requires eval and non-strict mode.
Verdict
JS-Confuser offers browser-based and API workflows with configurable obfuscation options. Treat obfuscation as a barrier rather than foolproof protection, and weigh the possible size, performance, and compatibility costs.
JS-Confuser plans and pricing
All plansCompared on code obfuscation software
- Free plan
- Yes
- Supported targets
- JavaScript, Node.js, browser
- Anti-tamper controls
- Yes
- Control-flow obfuscation
- Yes
- String encryption
- Yes
- Deployment model
- hybrid
- Build integration
- api
