Ktor is a framework to easily build connected applications – web applications, HTTP services, mobile and browser applications. Modern connected applications need to be asynchronous to provide the best experience to users, and Kotlin coroutines provide awesome facilities to do it in an easy and straightforward way. The goal of Ktor is to provide an end-to-end multiplatform framework for connected applications.

Getting started

Creating a new Ktor project

Creating HTTP APIs

Creating an interactive website

Creating a WebSocket chat

Configuring a server

Adding Ktor dependencies

Creating a server

Configuring a server in code or in a file

Plugins

Routing

Routing

Type-safe routing

Application structure

Handling requests

Sending responses

Serving static content

Plugins

Content negotiation and serialization

Templating

Authentication and authorization

Sessions

WebSockets

Swagger UI/OpenAPI

Custom plugins

Running, debugging, and testing

Running

Auto-reload

Testing

Deployment

Creating Fat JARs

WAR

GraalVM

Docker

Google App Engine

Heroku

Getting started

Creating a client application

Creating a WebSocket chat client

Creating a cross-platform mobile application

Setting up the client

Adding client dependencies

Creating and configuring a client

Engines

Plugins

Requests

Making requests

Type-safe requests

Default request

Retrying failed requests

Responses

Receiving responses

Response validation

Plugins

Content negotiation and serialization

Authentication and authorization

Cookies

Content encoding

Caching

WebSockets

Custom plugins

Testing

Testing

API Docs