# http4k

Kotlin toolkit for serving and consuming HTTP services, in which an HTTP application is a Kotlin function.


Source: https://findsoftware.frbit.cloud/http4k/
Last reviewed: 2026-10-26
Listed since: 2026-10-26

## Record

### Links

- home: https://www.http4k.org/
- repository: https://github.com/http4k/http4k
- docs: https://www.http4k.org/learn/
- pricing: https://www.http4k.org/pro/

### Identity

- status: active
- maintainer: http4k Ltd
- maintainerType: company
- parent: unknown
- firstRelease: 2017
- hqCountry: GB

### Kind

- category: library
- hosting: java
- language: kotlin
- runtime: jvm
- runtimeMin: jvm 21
- basedOn: unknown

### Content

- contentStore: not applicable
- databases: not applicable
- adminUi: not applicable
- headlessApi: not applicable
- templating: not applicable
- i18n: not applicable

### Rendering and deploy

- runsAs: always-on
- renderingModes: server
- installMethod: Gradle dependency on Maven Central artifacts

### License

- licenseModel: open-core
- license: Apache-2.0, http4k Commercial License

### Releases

- currentMajor: 6
- latestReleaseDate: 2026-09-29

### Adoption

- githubStargazers: 2791
- packagistDownloads: not applicable
- npmWeeklyDownloads: not applicable
- contributors: 168
- pluginCount: unknown
- packagistMonthlyDownloads: unknown
- ecosystemsMonthlyDownloads: unknown
- httpArchiveSites: unknown
- wordpressActiveInstalls: unknown
- dependentRepos: unknown
- dependentPackages: unknown

### Sources

- urls: https://www.http4k.org/ (read 2026-10-26)
- urls: https://api.github.com/repos/http4k/http4k (read 2026-10-26)
- urls: https://www.http4k.org/learn/ (read 2026-10-26)
- maintainer: https://raw.githubusercontent.com/http4k/http4k/master/LICENSE (read 2026-10-26)
- hqCountry: https://www.http4k.org/company/ (read 2026-10-26)
- language: https://api.github.com/repos/http4k/http4k (read 2026-10-26)
- category: https://www.http4k.org/ (read 2026-10-26)
- runtime: https://github.com/http4k/http4k/blob/master/README.md (read 2026-10-26)
- runtimeMin: https://www.http4k.org/enterprise/ (read 2026-10-26)
- installMethod: https://www.http4k.org/quickstart/ (read 2026-10-26)
- renderingModes: https://github.com/http4k/http4k/blob/master/README.md (read 2026-10-26)
- runsAs: https://github.com/http4k/http4k/blob/master/README.md (read 2026-10-26)
- license: https://github.com/http4k/http4k/blob/master/README.md (read 2026-10-26)
- license: https://raw.githubusercontent.com/http4k/http4k/master/LICENSE (read 2026-10-26)
- license: https://raw.githubusercontent.com/http4k/http4k/master/LICENSE (read 2026-10-26)
- license: https://www.http4k.org/pro/ (read 2026-10-26)
- urls: https://www.http4k.org/pro/ (read 2026-10-26)
- firstRelease: https://repo1.maven.org/maven2/org/http4k/http4k-core/0.21.0/http4k-core-0.21.0.pom (read 2026-10-26)
- currentMajor: https://api.github.com/repos/http4k/http4k/releases (read 2026-10-26)
- latestReleaseDate: https://api.github.com/repos/http4k/http4k/releases (read 2026-10-26)
- githubStargazers: https://api.github.com/repos/http4k/http4k (read 2026-10-26)
- contributors: https://api.github.com/repos/http4k/http4k/contributors (read 2026-10-26)

## Notes

http4k is a Kotlin toolkit for serving and consuming HTTP services. Its core library provides a base HTTP implementation and server and client implementations based on the JDK classes, and further modules add servers, clients, serverless support, templating and other capabilities. An application is mounted into a running server, so it runs as a long-lived process. The [quickstart](https://www.http4k.org/quickstart/) declares the modules as Gradle dependencies from Maven Central artifacts.

## Worth knowing

Most of the repository is under Apache 2.0, but the `pro/` directory, files that carry the http4k Commercial License notice and the `org.http4k.pro` artifacts fall under that commercial license. The Enterprise edition is a subscription, and the Pro modules are licensed per developer seat. From 1 October 2026, releases reach Maven Central about quarterly, while maven.http4k.org keeps its normal cadence.

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Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Attributes are recorded, never scored; absent means unknown.
Credit, in full: FindSoftware, CC BY 4.0