A simple json-path parser for scala

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The core functionality exposed in jp is json path parsing

import jp._

val path = Path("$.store.book[0].title")

Will return a Path object from which you may call result to get the corresponding ParseResult.

To make results more useful in applications, jp exposes a trait called Transform[I,O] which transforms a type I into type O given the json path parse results.

Below is an example of transforming a json path parse result with lift json.

import net.liftweb.json.JsonAST
import net.liftweb.json.Printer

path("""{"store":"book":[{"title":"test"}]}""")(as.lift.Json).fold(identity, { js =>
   Printer.pretty(JsonAST.render(js))
})

Passing in a Transform will result in Either[String, T] where String contains an error message for a potential malform parsing result, and T represents the type of the transformation, in this, a case JValue.

• (<expr>) expression evaluation $.store.book[(@.length-1)]
• @ current object references (only useful in (<expr>) contexts)
• ?(<bool expr>) filters $.store.book[?(@.price < 10)].title
• [,] union operator $..book[0,1]

Doug Tangren (softprops) 2012