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When I was a lecturer at Academia Desafío Latam, a student found this jsoncrack.com webapp and introduced me to it.

For a long time I’ve been looking for a tool to explore complex JSON objects. I build many side-projects (git_explorers, rip_grep, rails_explorer) to explore data. That’s the reason why I was amazed by Jsoncrack

When I tested the webapp in production, an annoying bug appeared which rendered a blank page in every visit. It was a method call to a null object. I submitted a PR to add a nullsafe operator, that simple line change fixed the problem.