JavaScript Obfuscator - JavaScript Obfuscator is a free online tool that obfuscates your source code, preventing it from being stolen and used without permission.
Uncrustify - Banish crusty code with the Uncrustify C/C++/C#/Obj-C/D/Java/Pawn/VALA source code beautifier.
Terser - JavaScript parser, mangler, optimizer and beautifier toolkit for ES6+
UglifyJS - JavaScript minifier, beautifier, mangler and parser toolkit.
Artistic Style - astyle, code formatting
Gnirts - Gnirts is a JavaScript library for obfuscating string literals by encoding them as different string literals.