json-path-ex

json-path-ex is an implementation of Goessners JsonPath with some extensions. It supports the full specification* (or at least what specification exists) for JsonPath along with the following syntax additions.

Note: Script expressions are not supported by json-path-ex

<?()> key filter expression

<?()> allows you to build filter expression based off of keys.

Example

{
	"foo": {
		"baz": 1
	},
	"bar": {
		"baz": 2
	},
	"other": {
		"baz": 3
	}
}

query: "$..<?(@ != 'bar')>.baz"

result: [
	1,
	3
]

query: "$.<?(@ == 'bar')>.baz"
result: [
	2
]

{} Sub-query

Sub-query allow you to dynamically reference JSON properties within your query by resolving. Sub queries must resolve to a single primitive type (number, string, or boolean) or else the whole query will return undefined.

Example

{
	"levels": [{ "acBoost": 1 }, { "acBoost": 2 }],
	"currentLevel": 1
}

query: "$.levels[{$.currentLevel}].acBoost"
result: 2