Using Scala CLI, you can require the entire toolkit in a single line:
//> using toolkit latest
Alternatively, you can require just a specific version of UPickle:
//> using dep com.lihaoyi::upickle:3.1.0
In your build.sbt file, you can add the dependency on the Toolkit:
lazy val example = project.in(file("example"))
.settings(
scalaVersion := "3.2.2",
libraryDependencies += "org.scala-lang" %% "toolkit" % "0.1.7"
)
Alternatively, you can require just a specific version of UPickle:
libraryDependencies += "com.lihaoyi" %% "upickle" % "3.1.0"
In your build.sc file, you can add the dependency to the upickle library:
object example extends ScalaModule {
def scalaVersion = "3.2.2"
def ivyDeps =
Agg(
ivy"org.scala-lang::toolkit:0.1.7"
)
}
Alternatively, you can require just a specific version of UPickle:
ivy"com.lihaoyi::upickle:3.1.0"
Construct a new JSON structure with uJson
val obj: ujson.Value = ujson.Obj(
"library" -> "upickle",
"versions" -> ujson.Arr("1.6.0", "2.0.0", "3.1.0"),
"documentation" -> "https://com-lihaoyi.github.io/upickle/",
)
Learn more about constructing JSON in the uJson documentation.
Defining custom JSON serialization
You can customize the ReadWriter of your data type by mapping the ujson.Value, like this:
import upickle.default._
case class Bar(i: Int, s: String)
object Bar {
implicit val barReadWriter: ReadWriter[Bar] = readwriter[ujson.Value]
.bimap[Bar](
x => ujson.Arr(x.s, x.i),
json => new Bar(json(1).num.toInt, json(0).str)
)
}
val bar = Bar(5, "bar")
val json = upickle.default.write(bar)
println(json)
// prints: [5, "bar"]
import upickle.default.*
case class Bar(i: Int, s: String)
object Bar:
given ReadWriter[Bar] = readwriter[ujson.Value]
.bimap[Bar](
x => ujson.Arr(x.s, x.i),
json => new Bar(json(1).num.toInt, json(0).str)
)
val bar = Bar(5, "bar")
val json = upickle.default.write(bar)
println(json)
// prints: [5, "bar"]
Learn more about custom JSON serialization in the uPickle documentation.