JSONPath is a lightweight component that allows to find and extract relevant portions out of JSON structures on the client as well as on the server. You can read more about it. There are Wiki pages about usage and examples in Javascript and PHP. Extensive...
JSONPath。 XPath の JSON 版。簡単な式で JSON 内の特定のデータを取得することができる。軸という概念がないためシンプルに実装可能。構造体からのパラダイムシフト?