JSONFormatter.org is described as 'Online JSON Formatter and JSON Validator will format json data, and helps to validate, convert JSON to XML, JSON to CSV. Save and Share JSON'. There are more than 10 alternatives to JSONFormatter.org, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and JSON. The best alternative is Json Editor, which is free. Other great sites and apps similar to JSONFormatter.org are JSON Editor Online (Free), JSONedit (Free), JSONLint (Free, Open Source) and JSON Formatter & Validator (Free).
JSON Online Viewer is a fast JSON tree visualizer. Intended for small-to-medium sized JSON texts. Main features are: visually pleasing, easy interactivity and reliability. The tree can be searched with the browser's native search function (Ctrl-F).