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I've just recently started delving deeply into JSON myself, integrating a Shopify storefront with a FileMaker backend.
Here are some resources/apps that helped me immensely:
Generator - Geist Interactive -- generate and map JSON keys to FileMaker fields
JSON Introduction - W3Schools JSON tutorial
JSON Query - app to test JSON paths (OS X)
Thanks Peter. Generator has been helping a lot too for creating the JSON query. Will check out the others.
if you need to retrieve things along a path (an element of an alement) then JSONpath is the best tutorial to look for.