What are some alternatives?
When comparing JSON Lint Pro for Desktop 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.
JSONedit - JSON editor for Windows and Wine with tree, list and text views.
JSON Editor Online - View, edit and format JSON online
JSON Online Viewer - JSON Online Viewer is a fast JSON tree visualizer.
JSONMate - JSON tree editor, inspector and beautifier
BeautifyTools JSON Validator - Use JSON Validator to validate JSON code and find errors to fix.