# jooby-project/jooby

The modular web framework for Java and Kotlin

Repository: https://github.com/jooby-project/jooby
Canonical: https://ross.abutalabs.com/products/jooby
Homepage: https://jooby.io
Language: Java
License: Apache-2.0
License Family: permissive
Topics: micro-framework, web-framework, modular, kotlin, webframework, microframework
Last push: 2026-08-24T14:32:52+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 96, longevity 100
- inputs: {"age_days": 4336, "days_push": 9, "days_rel": 26, "gap_med": 7.0, "n_releases_24m": 59}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1780, forks 201 (observed 2026-08-28T04:05:35.351365+00:00)

## What it is
Jooby is a modular, high-performance web framework for Java and Kotlin that runs on Netty, Jetty, or Undertow. It offers both a fluent Script API and an annotation-based MVC API, with 50+ modules for database access, security, OpenAPI generation, and more.

## Use cases
- build a REST API in Java or Kotlin
- create lightweight microservices with fast startup
- generate OpenAPI/Swagger docs automatically from code
- build web apps with hot-reload during development
- write reactive endpoints with Kotlin coroutines or RxJava
- serve static sites and SPAs from a JVM backend

## When to choose
- you want a fast, lightweight JVM web framework with low memory footprint
- you need first-class Kotlin DSL support alongside Java
- you want modular dependencies where you only include what you use
- you need built-in OpenAPI 3 documentation generation
- you want choice of server engine (Netty, Jetty, Undertow)

## When to avoid
- your team is standardized on Spring Boot's ecosystem and tooling
- you need a non-JVM language
- you prefer a full-stack batteries-included framework with opinionated defaults
- your project requires a framework with a larger community and plugin marketplace

## Facets
- artifact type: framework
- maturity: active
- function: web-framework, routing, middleware, templating, api-framework, http-server
- domain: web-development, backend, apis, microservices, developer-tools
- platform: jvm, cross-platform
- tags: netty, jetty, undertow, openapi, hot-reload, microservices, kotlin-coroutines, reactive

## Member repositories
- jooby-project/jooby (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:35.351365+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:24:35.716178+00:00, confidence not recorded.
  - readme: https://github.com/jooby-project/jooby (fetched 2026-08-28T04:05:35.351365+00:00, sha 65c88614aeb8)
  - homepage: https://jooby.io (fetched 2026-08-29T11:03:11.749788+00:00, sha 7c19c548dc7c)
  - site_page: https://jooby.io/modules/openapi (fetched 2026-08-29T11:03:11.756411+00:00, sha 8bfcfe7a9c9b)
- Data as of 2026-08-30T08:39:29.467469+00:00.