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JSONPath - XPath for JSON
JSONPath expressions always refer to a JSON structure in the same way as XPath expression are used in combination with an XML document. Since a JSON structure is usually anonymous and doesn't necessarily have a "root member object" JSONPath assumes the abstract name $ assigned to the outer level object. JSONPath expressions can use the dot –notation $.store.book[0].title or the bracket –notation
<a href="http://ad.doubleclick.net/adj/ttm.xml/art;tn=3;tw=300;th=55;to=h;tcs=0;tcp=0;ta=center;tva=bottom;tc=ffffff;tnm=3;te=1;sz=100x50;ord=123456789?" target="_blank"><img src="http://ad.doubleclick.net/adj/ttm.xml/art;tn=3;tw=300;th=55;to=h;tcs=0;tcp=0;ta=center;tva=bottom;tc=ffffff;tnm=3;te=1;sz=100x50;ord=123456789?" width="100" height="50" border="0" alt="" /></a> May 31, 2006 More and more web service providers seem to be interested in offering JSON APIs beneath their XML APIs. One considerable advantage of using a JSON API is its ability to provide cross-domain requests while bypassing the restrictive same domain policy of the XmlHttpRequest object.
Converting Between XML and JSON