"several new features have been added, including several F# specific features, support for JSONPath querying, ability to integrate with Dependency Injection frameworks, ability to Merge JSON objects and more."
James Newton-King - Json.NET 6.0 Release 4 - JSON Merge, Dependency Injection
JSONPath - XPath for JSON
The following XPath expression
/store/book[1]/title
would look like
x.store.book[0].title
or
x['store']['book'][0]['title']
JSONPath expressions can use the dot–notation
$.store.book[0].title
or the bracket–notation
$['store']['book'][0]['title']
Expressions of the underlying scripting language (<expr>) can be used as an alternative to explicit names or indices as in
$.store.book[(@.length-1)].title
using the symbol '@' for the current object. Filter expressions are supported via the syntax ?(<boolean expr>) as in
$.store.book[?(@.price < 10)].title
| 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 |
