How do I convert normal JavaScript to JSFuck?

Use online tools like jsfuck.com or write custom scripts that leverage the Function constructor, but it requires understanding the derivation process from the README, such as generating characters from undefined and using type coercion.

Is JSFuck good for obfuscating real code?

No, it's too verbose and easily detectable; dedicated obfuscation tools offer better balance between size and security without the extreme bloat and complexity of JSFuck.

JSFuck vs other code golf techniques: which is more minimal?

JSFuck is unique in using only six characters, but other esolangs or golfing styles might achieve different constraints; it's best for JavaScript-specific challenges focused on character reduction.

Can JSFuck run any JavaScript code, including ES6 features?

Yes, since it uses the Function constructor to evaluate strings, it can execute any valid code, but generating JSFuck for complex features like async/await is non-trivial and rarely done.

What are the main limitations of JSFuck?

Key limitations include code size explosion, browser inconsistencies in string representations, and the need for parentheses, though alternatives are discussed in the README but add complexity.

How does JSFuck handle function calls with multiple arguments?

Through complex techniques like using reduce and bind, as detailed in the README's section on calling methods with more than one argument, which significantly increases code length and difficulty.

Open-Awesome

jsFuck

WTFPLJavaScript

An esoteric JavaScript style that writes and executes any code using only six characters: []()!+.

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8.6k stars681 forks0 contributors

What is jsFuck?

JSFuck is an esoteric programming style that writes and executes any JavaScript code using only six characters: `[`, `]`, `(`, `)`, `!`, and `+`. It solves the challenge of extreme code minimalism by exploiting JavaScript's type coercion, primitive wrappers, and function constructors to generate all necessary characters and operations.

Target Audience

JavaScript enthusiasts, security researchers, and educators interested in language quirks, code obfuscation, and programming puzzles.

Value Proposition

Developers choose JSFuck for its unique educational value, demonstrating JavaScript's flexibility and edge cases in a constrained, mind-bending way that no other project replicates.

Overview

Write any JavaScript with 6 Characters: !+

Use Cases

Best For

Understanding JavaScript type coercion and primitive wrappers
Writing obfuscated or minimal JavaScript code
Educational demonstrations of language fundamentals
Programming challenges and code golf competitions
Exploring esoteric programming styles
Security research on non-alphanumeric code execution

Not Ideal For

Production web development requiring readable, maintainable code and standard practices
Projects where code size or execution performance is a critical concern
Educational settings focused on teaching clean code and industry best practices
Security-sensitive applications needing transparent, auditable code

Pros & Cons

Pros

Minimal Character Set

Uses only six characters ([], (), !, +) to write any JavaScript, demonstrating extreme language flexibility through type coercion and primitive wrappers, as shown in the README's derivation of characters from values like undefined and true.

Educational Depth

Illustrates JavaScript's type system, coercion, and function execution via hands-on examples, making it a valuable resource for understanding language internals beyond surface-level syntax.

Environment Agnostic

Runs in any JavaScript environment without dependencies, as stated in the README, ensuring compatibility with both browsers and Node.js for experimental use.

Creative Problem-Solving

Encourages exploration of language constraints, with the README's 'Alternatives' section discussing different character sets and execution methods, fostering innovative thinking.

Cons

Browser Inconsistencies

The README admits that string representations of native functions differ between browsers (e.g., Firefox uses line breaks), which can break portability and reliability of JSFuck code.

Extreme Verbosity

Code becomes massively inflated; the alert(1) example is hundreds of characters long, rendering it impractical for any real-world application due to bloated size and poor readability.

No Practical Utility

Purely academic and esoteric, serving only for education, obfuscation, or puzzles, with no support for modern development workflows or production use cases.

Complex Generation Process

Generating JSFuck code requires deep, manual understanding of JavaScript quirks, as the README shows intricate steps to derive characters and methods, making it inaccessible for casual use.

Frequently Asked Questions

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