Javalin

A simple web framework for Java and Kotlin

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README.md

Javalin - A simple web framework for Java and Kotlin

Javalin is a very lightweight web framework for Kotlin and Java which supports WebSockets, HTTP2 and async requests. Javalin’s main goals are simplicity, a great developer experience, and first class interoperability between Kotlin and Java.

Javalin is more of a library than a framework. Some key points:

You don't need to extend anything
There are no @Annotations
There is no reflection
There is no other magic; just code.

General information:

❤️ Sponsor Javalin
The project webpage is javalin.io (repo for webpage is at github.com/javalin/javalin.github.io).
Documentation: javalin.io/documentation
Chat on Discord: https://discord.gg/sgak4e5NKv
Chat on Slack: https://join.slack.com/t/javalin-io/shared_invite/zt-1hwdevskx-ftMobDhGxhW0I268B7Ub~w
Contributions are very welcome: CONTRIBUTING.md
License summary: https://tldrlegal.com/license/apache-license-2.0-(apache-2.0)
Interesting issues: /javalin/javalin/issues?q=label:INFO

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javalin javalin Public

A simple and modern Java and Kotlin web framework

Kotlin 8.3k 646
website website Public

Javalin website source code

JavaScript 39 98
javalin-openapi javalin-openapi Public

Annotation processor for compile-time OpenAPI & JsonSchema, with out-of-the-box support for Javalin 5.x, 6.x & 7.x, Swagger & ReDoc

Kotlin 66 23
javalin-samples javalin-samples Public

Collection of many example projects for Javalin 4+

Kotlin 27 22

Repositories

Type Language Sort

javalin-performance-tests-testing Public

javalin/javalin-performance-tests-testing's past year of commit activity

Python 0 Apache-2.0 0 0 0 Updated Aug 19, 2026
javalin Public
A simple and modern Java and Kotlin web framework

javalin/javalin's past year of commit activity

Kotlin 8,337 Apache-2.0 646 12 (1 issue needs help) 6 Updated Aug 15, 2026
javalin-graphql Public
Artifact/module for enabling graphql support in Javalin

javalin/javalin-graphql's past year of commit activity

Kotlin 7 Apache-2.0 1 2 0 Updated Aug 15, 2026
website Public
Javalin website source code

javalin/website's past year of commit activity

JavaScript 39 98 14 1 Updated Aug 13, 2026
javalin-routing-extensions Public
Set of alternative routing implementations for Javalin 5.x, 6.x & 7.x

javalin/javalin-routing-extensions's past year of commit activity

Kotlin 22 MIT 4 4 (1 issue needs help) 2 Updated Aug 12, 2026
javalin-openapi Public
Annotation processor for compile-time OpenAPI & JsonSchema, with out-of-the-box support for Javalin 5.x, 6.x & 7.x, Swagger & ReDoc

javalin/javalin-openapi's past year of commit activity

Kotlin 66 Apache-2.0 23 6 1 Updated Aug 12, 2026
javalin-samples Public
Collection of many example projects for Javalin 4+

javalin/javalin-samples's past year of commit activity

Kotlin 27 Apache-2.0 22 3 0 Updated Jun 19, 2026
javalin-ssl Public
Straightforward SSL Configuration for Javalin!

javalin/javalin-ssl's past year of commit activity

10 1 1 0 Updated May 8, 2024
javalin-rendering Public archive
Artifact/module for server-side template/markdown rendering in Javalin: https://javalin.io/plugins/rendering

javalin/javalin-rendering's past year of commit activity

Kotlin 12 Apache-2.0 8 4 0 Updated May 8, 2024
codeowner-selfmerge-action Public Forked from OSS-Docs-Tools/code-owner-self-merge
Fork of a GitHub Action for letting CODEOWNERS merge PRs via green PR reviews

javalin/codeowner-selfmerge-action's past year of commit activity

JavaScript 1 MIT 18 0 1 Updated May 6, 2024