Often following imports are needed when working with lift-json:

import net.liftweb.json._
import net.liftweb.json.JsonAST._
import net.liftweb.json.JsonParser._
import net.liftweb.json.Printer._

With Scala 2.8 package objects it is possible to put most used types and functions into a package object, letting the user to import those into scope simply by

import net.liftweb.json._