Compile-time JSON marshaling and abstraction for Scala, Scala Native and Scala.js
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colinrgodsey Merge pull request #22 from MediaMath/scala_native
add crossbuild for scala native, update scala-js, update docs
Latest commit 467ae30 Mar 17, 2017


import json._

@accessor case class Book(name: String, pages: Int, chapters: Seq[String])

Book("Making JSON Easy in Scala", 2, List("Getting Started, Fast", "Getting Back to Work")).js

res0: json.JObject =
  "name": "Making JSON Easy in Scala",
  "pages": 2,
  "chapters": ["Getting Started, Fast", "Getting Back to Work"]


Compile time JSON marshalling of primitive values, case-classes, basic collections, and whatever you can imagine for scala, scala-native and scala-js.

  • Extensible accessor API. Serialize any type you want.
  • Provides a useful JS-like AST for intermediate JSON data.
  • Implicit accessors that chain to resolve Higher-Kind types (e.g. Option[T]).
  • Uses default fields correctly.
  • Preserves object field order.
  • Rich field exceptions with field names (all field errors, not just the first), perfect for form validation.
  • Ability to use non-string key types in a Map (for key types that serialize to JString).
  • Enables use of normal looking scala structures with any previously existing JSON API.
  • Produces pretty and human readable JSON from normal scala types.
  • Supports scala-js so you can extend your models to the web.
  • Supports scala-native so you can take your models everywhere else (requires jansson, available through apt, brew, etc).
  • Enables you to create readable APIs that match existing/specific class structure.
  • Exposes rich compile-time type info, more run-time type data than reflect could ever provide.
  • Uses existing scala collection CanBuildFrom factories to support buildable collections.
  • Provides support for unknown types (Any) via 'pickling' with a run-time class registry.
  • Support for scala 2.10.x, 2.11.x, 2.12.0-M3.
  • Support for scala-js 0.6.x.
  • Support for scala-native 0.1.x.


  • Usage and Examples - Getting started with basic usage and examples.
  • Accessors - Accessors are the compile-time constructs that allow you to go from a JValue to a scala type and back.
  • Registry - The Accessor Registry allows you to pickle registered types from untyped (Any) data.
  • Enumerator - Allows enumerated case object values of a sealed trait (useful for map keys).
  • EpochDeadline - Clone of scala's Deadline that serializes to numeric Unix epoch time.
  • Migration - Uses a version field in JSON to transform old schemas to new ones.
  • Scaladocs


resolvers += "mmreleases" at ""

libraryDependencies += "com.mediamath" %% "scala-json" % "1.0"

//or scala + scala-js/scala-native
libraryDependencies += "com.mediamath" %%% "scala-json" % "1.0"

//for @accessor annotation support
resolvers += Resolver.sonatypeRepo("releases")
addCompilerPlugin("org.scalamacros" % "paradise" % "2.1.0" cross CrossVersion.full)