| XPath |
JSONPath |
Description |
| / |
$ |
the root object/element |
| . |
@ |
the current object/element |
| / |
. or [] |
child operator |
| .. |
n/a |
parent operator |
| // |
.. |
recursive descent. JSONPath borrows this syntax from E4X. |
| * |
* |
wildcard. All objects/elements regardless their names. |
| @ |
n/a |
attribute access. JSON structures don't have attributes. |
| [] |
[] |
subscript operator. XPath uses it to iterate over element collections and for predicates. In Javascript and JSON it is the native array operator. |
| | |
[,] |
Union operator in XPath results in a combination of node sets. JSONPath allows alternate names or array indices as a set. |
| n/a |
[start:end:step] |
array slice operator borrowed from ES4. |
| [] |
?() |
applies a filter (script) expression. |
| n/a |
() |
script expression, using the underlying script engine. |
| () |
n/a |
grouping in Xpath |
| XPath |
JSONPath |
Result |
/store/book/author |
$.store.book[*].author |
the authors of all books in the store |
//author |
$..author |
all authors |
/store/* |
$.store.* |
all things in store, which are some books and a red bicycle. |
/store//price |
$.store..price |
the price of everything in the store. |
//book[3] |
$..book[2] |
the third book |
//book[last()] |
$..book[(@.length-1)]
$..book[-1:] |
the last book in order. |
//book[position()<3] |
$..book[0,1]
$..book[:2] |
the first two books |
//book[isbn] |
$..book[?(@.isbn)] |
filter all books with isbn number |
//book[price<10] |
$..book[?(@.price<10)] |
filter all books cheapier than 10 |
//* |
$..* |
all Elements in XML document. All members of JSON structure. |
本文转自http://goessner.net/articles/JsonPath/