Skip to content
Redux implementation for Kotlin (supports multiplatform JVM, native, JS, WASM)
Kotlin JavaScript CSS
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.
.circleci Merge branch 'task/website-CD' of… Sep 28, 2019
buildSrc update to kotlin 1.3.60 (#29) Nov 30, 2019
gradle update to kotlin 1.3.60 (#29) Nov 30, 2019
lib update docs to use 0.3.1 (#36) Dec 19, 2019
website update docs to use 0.3.1 (#36) Dec 19, 2019
.gitignore Removed libs from .gitignore, doc updates Sep 23, 2019 update docs to use 0.3.1 (#36) Dec 19, 2019
LICENSE Update LICENSE Sep 14, 2019 update docs to use 0.3.1 (#36) Dec 19, 2019
build.gradle initial commit. Redux without tests May 24, 2019
gradlew updated to gradle 5.6-rc1 Aug 5, 2019
gradlew.bat updated to gradle 5.6-rc1 Aug 5, 2019
settings.gradle [WIP] add todo example Sep 18, 2019



badge badge badge badge badge badge badge badge

A redux standard for Kotlin that supports multiplatform projects

Misson Statement

Provide a standard redux implementation for Kotlin. In doing so will foster a ecosystem of middleware, store enhancers, & dev tools. These core values will guide descisions for the project:

  • core redux-kotlin will be a minimal implementation that other libraries can build upon
  • modular development (follow example of
  • support for all platforms supported by Kotlin multiplatform (JVM, iOS, Native, JS, WASM)
  • developed in open and enable discussion for all interested parties via open channels (slack, github, etc. TBD)
  • not owned by a individual or company

Redux in Kotlin, and in mobile in particular, may differ a bit from javascript. Many have found the basic pattern useful on Android & iOS leading to tens of opensource redux libraries in Kotlin, Java, and Swift, yet an ecosystem has yet to emerge. A port of javascript redux is a good starting point for creating a standard and will aid in cross-pollination of middleware, store enhancers, & dev tools from the javascript world.

Redux has proven helpful for state managment in mobile. A multiplatform Kotlin implementation & ecosystem will increase developer productivity and code reuse across platforms.

Droidcon NYC Slides Video TBA

*** PLEASE FILL OUT THE Redux on Mobile Survey ***

How to add to project:

Artifacts are hosted on maven central. They are published with gradle metadata, so you may need to enable with enableFeaturePreview("GRADLE_METADATA") in your settings.gradle file. For multiplatform, add the following to your shared module:

kotlin {
  sourceSets {
        commonMain { //   <---  name may vary on your project
            dependencies {
                implementation "org.reduxkotlin:redux-kotlin:0.3.1"

For JVM only:

  implementation "org.reduxkotlin:redux-kotlin-jvm:0.3.1"

Usage is very similar to JS Redux and those docs will be useful These docs are not an intro to Redux, and just documentation on Kotlin specific bits. For more info on Redux in general, check out

Create an AppState class

  data class AppState(val user: User, val feed: List<Feed>)

Create Reducers:

  val reducer: Reducer<AppState> =  { state, action ->
    when (action) {
        is UserLoggedInAction -> state.copy(user = action.user)

Create Middleware: There are a few ways to create middleware:

Using a curried function stored in a val/var:

  val loggingMiddleware: Middleware = 
          { store ->
              { next ->
                  { action ->
                        //log here

Using a function:

  fun loggingMiddleware(store: Store) = { next: Dispatcher -> 
              { action: Any -> 
                     //log here

Using the convinence helper function middleware:

   val loggingMiddleware = middleware { store, next, action -> 
          //log here

Create a store

  val store = createStore(reducer, AppState(user, listOf()), applyMiddleware(loggingMiddleware))

You then will have access to dispatch and subscribe functions from the store.


Want to give feedback, contribute, or ask questions?

#redux slack channel in kotlinlang

Trello boards -

Or create an issue on github.

You can’t perform that action at this time.