What are some alternatives?
When comparing JSONLinter and JSONFormatter.org, you can also consider the following products
JSONLint - JSON Lint is a web based validator and reformatter for JSON, a lightweight data-interchange format.
JSON Lint Pro for Desktop - JSON Lint Pro for Desktop is, simply, ...
JSONMate - JSON tree editor, inspector and beautifier
BeautifyTools JSON Validator - Use JSON Validator to validate JSON code and find errors to fix.
JSONedit - JSON editor for Windows and Wine with tree, list and text views.
JSON Formatter & Validator - The JSON Formatter was created to help with debugging.