好用的json-path

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Here is a complete overview and a side by side comparison of the JSONPath syntax elements with its XPath counterparts.

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