The new Dictionaries docs - MIT
The Web block to extract a dictionary from JSON (draggable)
Blocks based JSON Browser - ABG
Blocks based JSON Filter and Lookup (2018, needs dictionary update) - ABG
Extracting data from JSON text (2016, needs refesh for dictionaries)
JSONTools extension - Luke Gackle
Web Component – JSON Response On App Inventor - Sajal Dutta
JSON Path Finder - @Luc_Volders
How to Prettify JSON with JavaScript - @Kevinkun
Collapsible JSON WebViewer - @Osmany_Ferrer_Borges , @TIMAI2