JSON Online Viewer is described as '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)'. There are more than 10 alternatives to JSON Online Viewer, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and JSON. The best alternative is Boop, which is both free and Open Source. Other great sites and apps similar to JSON Online Viewer are JSON Editor Online (Free), JSONFormatter.org (Free), JSON Formatter & Validator (Free) and JSONLint (Free, Open Source).