JSONLint - JSON Lint is a web based validator and reformatter for JSON, a lightweight data-interchange format.
Uncrustify - Banish crusty code with the Uncrustify C/C++/C#/Obj-C/D/Java/Pawn/VALA source code beautifier.
JSON Formatter & Validator - The JSON Formatter was created to help with debugging.
Artistic Style - astyle, code formatting
JSON Editor Online - View, edit and format JSON online
JavaScript Obfuscator - JavaScript Obfuscator is a free online tool that obfuscates your source code, preventing it from being stolen and used without permission.