// SHOWCASE

Showcase

Example applications and usages of http4k, including TDD approach

Talks

Here's a curated list of talks worth watching. Check out the YouTube Playlist for the latest collection of talks featuring http4k.

Full Stream Ahead: Breaking the Protocol Barrier with http4k

May 2025slides/code

Functional Intelligence: Agents, MCP and the end of the Web(?)

Apr 2025slides/code

Build a REST API with Kotlin and Http4k

Mar 2025code

Have your Serverless Kotlin Functions and Eat Them Too

May 2024

Exploring the Testing Hyperpyramid with Kotlin & http4k @KotlinConf

Oct 2023slides/code

Test Driven Gilded Rose in Kotlin by Duncan McGregor

Nov 2021full series

Talking Kotlin ep. 99: HTTP as a function with http4k

Nov 2021audio

http4k: Server as a Function (Kotlin Webinars vol. 3)

Jun 2021webinar series

Introduction to http4k by Dmitry Kandalov

May 2021

Writing Test Driven Apps with http4k @ Kotliners

Nov 2020

Designing Microservices in Functional Style by Uberto Barbini @ VirtualJUG

Oct 2020

Server as a Function. In Kotlin. _______________ @ KotlinConf

Oct 2018slides

Standalone projects

Each project is tagged with the http4k features it demonstrates:

AWSGraalVMSecurityGraphQLHexagonalHotwireOpenApiQuarkusWebsockets

A collection of examples using various http4k features.

http4k/examples

TemplatesTestingJSON / LensesCD pipelineApproval TestingOpenApiStatic resources

TDD’d example application

http4k/http4k-by-example

TestingHttp ClientMultipartAWSCD pipelineServerlessGraalVM

Dropbox clone in 100 lines of Kotlin

http4k/http4kbox

TestingWebsocketsCD PipelineStatic resources

Simple websocket driven chat-server in 30 lines of Kotlin

http4k/http4k-irc

TestingJSON / LensesCD pipeline

Todo backend (standard routing)

http4k/http4k-todo-backend

TestingJSON / LensesOpenApiCD pipeline

Todo backend (contract routing)

http4k/http4k-contract-todo-backend

TestingContracts

Real World example (Medium clone)

alisabzevari/kotlin-http4k-realworld-example-app