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Maryk Maryk

What is Maryk?

Maryk is a Kotlin Multiplatform toolkit for data. You describe your data once — with types and validation — and use that same model across clients and servers. No drift, no duplicate schemas.

What you get at a glance

Section titled “What you get at a glance”
  • One strongly‑typed model for all platforms (JVM, Android, iOS, macOS, Linux, Windows, JS).
  • Built‑in validation and rich property types (primitives, collections, embedded, multi‑type, value objects).
  • Version‑aware storage and queries: ask for “what changed” or “as of time T”.
  • Portable serialization: fast YAML/JSON streaming and compact ProtoBuf transport.
  • Pluggable stores with the same API (In‑Memory, RocksDB, FoundationDB, Remote).
  • Desktop tooling: the App and CLI for browsing and editing stores.

A tiny taste

Section titled “A tiny taste”
object Person : RootDataModel<Person>() {
  val firstName by string(index = 1u)
  val lastName by string(index = 2u)
  val dateOfBirth by date(index = 3u)
}


val john = Person.create { firstName with "John"; lastName with "Smith" }
Person.validate(john) // throws if invalid

Why this matters

Section titled “Why this matters”
  • Fewer bugs — one canonical model means fewer mismatches between app and backend.
  • Less bandwidth — request only the fields you need (reference graphs) or only the changes since last time.
  • Easier evolution — serialize schemas and run compatibility checks; migrate stores safely when models change.

When Maryk fits

Section titled “When Maryk fits”
  • You’re building multi‑client apps and want a single source of truth for data.
  • You need time‑travel/debuggability or live change streams.
  • You like Kotlin and want to share as much logic as possible across platforms.

Next steps

Section titled “Next steps”