JavaScript Obfuscator

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What JavaScript Obfuscator is

JavaScript Obfuscator transforms JavaScript into code that is harder to understand, with the aim of protecting source code. Its free standard obfuscation runs entirely in the browser without usage limits. Available transformations include variable renaming, string extraction and encryption, dead-code injection, and control-flow flattening. Paid plans add REST API and npm integration for virtual-machine obfuscation, which compiles function bodies into custom bytecode executed by an embedded JavaScript virtual machine. Paid plans can also process HTML containing marked inline JavaScript while keeping the surrounding HTML structure. Basic JavaScript runs in the browser; VM and HTML requests are processed on the service’s servers and discarded afterward. Listed build integrations include Webpack, Esbuild, Gulp, Grunt, Rollup, Netlify, Snowpack, and Vite. Output targets Node.js and evergreen desktop browsers, as well as iOS 16 and later; older browser support is best-effort. TypeScript and JSX should be compiled first, and projects should be bundled. The documentation warns that obfuscation is not encryption and transformed code may be slower and larger.

Who it suits

JavaScript Obfuscator suits developers who want to make client-side JavaScript harder to read or add obfuscation to a build workflow. Paid API and VM options may suit teams needing those integrations.

What it does well

Unlimited standard obfuscation runs in the browser.
Includes control-flow and string transformations.
Lists integrations for common build tools.
Supports Node.js and evergreen desktop browsers.

What to know first

Obfuscation does not encrypt code.
Obfuscated code may be 15% to 80% slower.
TypeScript and JSX need compilation first.
VM and HTML requests are processed on servers.

Limits

The Free plan includes 25 MB lifetime VM quota and a 4 MB VM file size limit; standard obfuscation is unlimited. Pro costs $19 a month and includes 100 MB/month VM quota, 30 MB/day, a 4 MB file limit, and up to 10 files. Team costs $59 a month and Business costs $149 a month, with their own shared quotas, daily allowances, member caps, and VM file limits.

Plans

Plan	Billed and limits	Price
Free	no credit card required · 25 MB lifetime VM quota · 4 MB VM file size limit · Unlimited standard obfuscation	Free
Business	billed monthly · 2.5 GB/month shared VM quota · 600 MB/day/member · Up to 15 members · 10 MB VM file size limit · Priority support	$149 a month
Pro	billed monthly · 100 MB/month VM quota · 30 MB/day · 4 MB VM file size limit · Up to 10 files · REST and npm API	$19 a month
Team	billed monthly · 500 MB/month shared VM quota · 150 MB/day/member · Up to 5 members · 7 MB VM file size limit	$59 a month

As github.com lists them, read 30 Sept 2026. The maker's own page has the final word.

Getting started

Open the project website at https://github.com/javascript-obfuscator/javascript-obfuscator.
Choose the browser, API, extension, or self-hosted route that fits your work.
Compile TypeScript or JSX to JavaScript before processing.
Bundle the project before obfuscation.
For VM or HTML processing, choose a paid plan with the required quota and file limit.

Verdict

JavaScript Obfuscator offers browser-based standard processing and paid VM and HTML options. Treat obfuscation as a readability barrier, not a place to store credentials or secrets.

Questions

Is JavaScript Obfuscator free?

Yes. Standard browser obfuscation is free without usage limits. The Free plan costs nothing and includes a 25 MB lifetime VM quota.

What does Pro cost?

Pro costs $19 a month, billed monthly. It includes REST and npm API access, 100 MB/month VM quota, and a 4 MB VM file size limit.

Which platforms and targets does it support?

Platforms include API, extension, self-hosted, and web. Supported targets are browser, browser-no-eval, and Node.js.

Is the package open source?

Yes. The package is distributed under the BSD-2-Clause license.

Can it process HTML files?

Paid plans can obfuscate HTML files containing marked inline JavaScript while preserving the surrounding HTML structure.

Does obfuscation encrypt my secrets?

No. The documentation says obfuscation is not encryption and advises against putting API keys, secrets, or credentials in frontend code.

Facts from JavaScript Obfuscator's own pages

API integration: Pro, Team, and Business plans provide REST API access and npm package integration for VM obfuscation. · obfuscator.io, 30 Sept 2026
Browser processing: Standard obfuscation runs entirely in the browser and is free without usage limits. · obfuscator.io, 30 Sept 2026
Build integrations: The project lists plugins and integrations for Webpack, Esbuild, Gulp, Grunt, Rollup, Weex, Malta, Netlify, Snowpack, and Vite. · github.com, 30 Sept 2026
Core features: The package provides variable renaming, string extraction and encryption, dead-code injection, control-flow flattening, and other code transformations. · github.com, 30 Sept 2026
HTML support: Paid plans can obfuscate HTML files containing marked inline JavaScript while preserving the surrounding HTML structure. · obfuscator.io, 30 Sept 2026
License: The open-source package is distributed under the BSD-2-Clause license. · github.com, 30 Sept 2026
Performance limit: The repository warns that obfuscated code can be 15% to 80% slower and files significantly larger depending on options. · github.com, 30 Sept 2026
Privacy: The service states that VM and HTML requests are processed on its servers and discarded after processing, while basic JavaScript obfuscation runs in the browser. · obfuscator.io, 30 Sept 2026
Purpose: JavaScript Obfuscator transforms JavaScript into harder-to-understand code to protect source code. · github.com, 30 Sept 2026
Runtime defenses: VM Self Defending detects integrity changes and hooks, while VM Debug Protection detects developer tools, breakpoints, and runtime inspection. · obfuscator.io, 30 Sept 2026
Runtime support: The output targets Node.js and supports evergreen desktop browsers plus iOS 16 and later, with older browsers supported only on a best-effort basis down to ES2015 modules. · obfuscator.io, 30 Sept 2026
Security limitation: The documentation says obfuscation is not encryption and advises against storing API keys, secrets, or credentials in frontend code. · obfuscator.io, 30 Sept 2026
Source requirements: TypeScript and JSX should be compiled to JavaScript before obfuscation, and projects should be bundled before processing. · obfuscator.io, 30 Sept 2026
VM protection: Obfuscator.io compiles function bodies into custom bytecode executed by an embedded JavaScript virtual machine. · obfuscator.io, 30 Sept 2026

Where JavaScript Obfuscator stands on Freedom251

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