JSONPath is described here. The gambas-json application will accept XPath, JSONPath, or ZPath formats. The format can be set with an Object Property and a flag.

Element	XPath	JSONPath	ZPath
root	/	$	$
current	.	@	.
child	/	. or []	/ or /[]
parent	..	n/a	..
recursive descent	//	..	/*/
subscript operator	[]	[]	[]
union operator	|	[,]	&+
array slice operator	n/a	[start: end: step]	[<start>-<end>]
script	[]	?()	@<cmd>

Sample XPath/JSONPath file.

XPath	JSONPath	ZPath	Result
/store/book/author	$.store.book[*].author	$/store/book[*]/author	the authors of all books in the store
//author	$..author	$/*/author	all authors
/store/*	$.store.*	$/store/*/	all things in store, which are some books and a red bicycle.
/store//price	$.store..price	$/store/*/price	the price of everything in the store.
//book[3]	$..book[2]	$/*/book[2]	the third book
//book[last()]	$..book[(@.length-1)]	$/*/book[(@count-1)]
	$..book[-1:]		the last book in order.
//book[position()<3]	$..book[0,1]	$/*/book[0-1]
	$..book[:2]		the first two books
//book[isbn]	$..book[?(@.isbn)]	$//book[]@where(./isbn!=null)	filter all books with isbn number
//book[price<10]	$..book[?(@.price<10)]	$//book[]@where(./price<10)	filter all books cheaper than 10
//*	$..*	$/*/	all Elements in XML document. All members of JSON structure.

The Result is a collection with the ZPath as the key and the value as the value. Similar to combining res1 and res2 in the JSONPath example into a single associative array.