Reputation: 2518
I want to convert a scala list of strings, List[String], to an Json object.
For each string in my list I want to add it to my Json object.
So that it would look like something like this:
{
"names":[
{
"Bob",
"Andrea",
"Mike",
"Lisa"
}
]
}
How do I create an json object looking like this, from my list of strings?
Upvotes: 6
Views: 20473
Reputation: 13922
Since I'm familiar with lift-json, I'll show you how to do it with that library.
import net.liftweb.json.JsonDSL._
import net.liftweb.json.JsonAST._
import net.liftweb.json.Printer._
import net.liftweb.json.JObject
val json: JObject = "names" -> List("Bob", "Andrea", "Mike", "Lisa")
println(json)
println(pretty(render(json)))
The names -> List(...)
expression is implicitly converted by the JsonDSL, since I specified that I wanted it to result in a JObject
, so now json
is the in-memory model of the json data you wanted.
pretty
comes from the Printer
object, and render
comes from the JsonAST
object. Combined, they create a String
representation of your data, which looks like
{
"names":["Bob","Andrea","Mike","Lisa"]
}
Be sure to check out the lift documentation, where you'll likely find answers to any further questions about lift's json support.
Upvotes: 4
Reputation: 5069
To directly answer your question, a very simplistic and hacky way to do it:
val start = """"{"names":[{"""
val end = """}]}"""
val json = mylist.mkString(start, ",", end)
However, what you almost certainly want to do is pick one of the many JSON libraries out there: play-json gets some good comments, as does lift-json. At the worst, you could just grab a simple JSON library for Java and use that.
Upvotes: 13