Ktor is divided into modules to allow fine-grained inclusion of dependencies based on the functionality required. The typical Ktor application would require ktor-server-core and a corresponding engine depending on whether it’s self-hosted or using an Application Server.

All artifacts in Ktor belong to io.ktor group and hosted on JCenter and Maven Central. Pre-release versions are published at Bintray

Ktor is split into several groups of modules:

• ktor-server contains modules that support running the Ktor Application with different engines: Netty, Jetty, Tomcat, and a generic servlet. It also contains a TestEngine for setting up application tests without starting the real server
  • ktor-server-core is a core package where most of the application API and implementation is located
  • ktor-server-jetty supports a deployed or embedded Jetty instance
  • ktor-server-netty supports Netty in embedded mode
  • ktor-server-tomcat supports Tomcat servers
  • ktor-server-servlet is used by Jetty and Tomcat and allows running in a generic servlet container
  • ktor-server-test-host allows running application tests faster without starting the full host
• ktor-features groups modules for features that are optional and may not be required by every application
  • ktor-auth provides support for different authentication systems like Basic, Digest, Forms, OAuth 1a and 2
  • ktor-auth-jwt adds the ability to authenticate against JWT
  • ktor-auth-ldap adds the ability to authenticate against LDAP instance
  • ktor-freemarker integrates Ktor with Freemarker templates
  • ktor-velocity integrates Ktor with Velocity templates
  • ktor-gson integrates with Gson adding JSON content negotiation
  • ktor-jackson integrates with Jackson adding JSON content negotiation
  • ktor-html-builder integrates Ktor with kotlinx.html builders
  • ktor-locations contains experimental support for typed locations
  • ktor-metrics adds the ability to add some metrics to the server
  • ktor-server-sessions adds the ability to use stateful sessions stored on a server
  • ktor-websockets provides support for Websockets
• ktor-client contains modules for performing http requests
  • ktor-client-core is a core package where most of the http HttpClient API is located
  • ktor-client-apache adds support for the Apache asynchronous HttpClient
  • ktor-client-cio adds support for a pure Kotlin Corutine based I/O asynchronous HttpClient
  • ktor-client-jetty adds support
  • ktor-client-auth-basic adds support for authentication
  • ktor-client-json adds support for json content negotiation
• ktor-network includes raw sockets for client/server, and TCP/UDP
  • ktor-network-tls contains TLS support for raw sockets

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