Free
Free
Javalin is an open-source framework available without licensing fees on javalin.io.
- Access
- Javalin is an open-source framework available without licensing fees on javalin.io.
Finding the possibilities
Javalin
● Identity checkedCode · Vendor site 2026-10-04
Javalin is a lightweight Java and Kotlin web framework for building REST APIs and web services on Jetty. It emphasizes minimal concepts, Java-Kotlin interoperability, optional async mode, and OpenAPI support through an official plugin.
- Category
- Code
- Free access
- Javalin is an open-source framework available without licensing fees on javalin.io.
- API access
- Framework for building HTTP APIs rather than a hosted third-party API product.
Is Javalin right for you?
A good fit for
Backend developers who want a small Jetty-based Java or Kotlin framework with OpenAPI tooling.
Before you choose
Teams must self-host applications; Javalin does not provide managed cloud hosting on the official site.
Minimal JVM web framework
Javalin offers a concise Java and Kotlin API for HTTP services with Jetty under the hood and optional OpenAPI documentation plugins.
What it can do
Features & capabilities
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Language support | Homepage shows equivalent Java and Kotlin hello-world examples with shared APIs. | Facts sourced | 2026-10-04 |
| OpenAPI | Site notes OpenAPI support including Swagger UI and ReDoc via the OpenAPI plugin. | Facts sourced | 2026-10-04 |
| Jetty runtime | Marketing states Javalin runs on Jetty with performance comparable to raw Jetty code. | Facts sourced | 2026-10-04 |
Understand the total cost
Javalin pricing & plans
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Frequently asked questions
What is Javalin used for?
Javalin is a lightweight Java and Kotlin web framework for building REST APIs and web services on Jetty. It emphasizes minimal concepts, Java-Kotlin interoperability, optional async mode, and OpenAPI support through an official plugin.
Does Javalin have a free plan?
Javalin is an open-source framework available without licensing fees on javalin.io.. This record lists ongoing free access; check the plan limits before starting.
How much does Javalin cost?
No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.
Can I use Javalin through an API?
Framework for building HTTP APIs rather than a hosted third-party API product.. API access and subscription access may have different terms; consult the linked sources.
What should I check before choosing it?
Teams must self-host applications; Javalin does not provide managed cloud hosting on the official site.
Price history
No retained pricing changes yet. A current price alone does not establish a historical trend.
How this profile is supported
Identity and profile
Reviewed vendor source
Read original source ↗Facts apply to the named version and check date. Send a sourced correction if something changed.