# eclipse-vertx/vert.x

Vert.x is a tool-kit for building reactive applications on the JVM

Repository: https://github.com/eclipse-vertx/vert.x
Canonical: https://ross.abutalabs.com/products/vertx
Homepage: https://vertx.io
Language: Java
License: NOASSERTION
License Family: other
Topics: vertx, java, netty, reactive, jvm, http2, concurrency, high-performance, nio, non-blocking, event-loop
Last push: 2026-08-25T16:10:24+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 5556, "days_push": 8, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 14686, forks 2113 (observed 2026-08-28T04:11:07.447565+00:00)

## What it is
Eclipse Vert.x is a polyglot toolkit for building reactive, non-blocking, asynchronous applications on the JVM, built on top of Netty. It provides low-level building blocks such as HTTP/TCP servers and clients, an event bus, and file system access, which can be composed freely rather than imposing a framework structure.

## Use cases
- build a high-throughput non-blocking HTTP server on the JVM
- write reactive microservices with an event bus
- make asynchronous HTTP requests to other services
- handle many concurrent connections with low resource usage
- build a GraphQL or gRPC server in Java or Kotlin
- run reactive applications in containers with high deployment density

## When to choose
- you need high concurrency and low latency on the JVM without blocking I/O
- you want a composable toolkit rather than an opinionated framework
- you are building microservices, API gateways, or real-time messaging systems
- you want polyglot support including Java, Kotlin, and reactive extensions like RxJava or Mutiny

## When to avoid
- your team prefers simple blocking, synchronous programming models
- you need a batteries-included full-stack framework with strict conventions
- your project is small and a plain servlet or Spring Boot stack is sufficient
- you are not targeting the JVM

## Facets
- artifact type: framework
- maturity: stable
- function: web-framework, http-server, http-client, websocket, rpc, concurrency
- domain: backend, web-development, microservices, developer-tools
- platform: jvm, windows, cross-platform
- tags: reactive, non-blocking, netty, event-bus, toolkit, high-performance, kotlin, microservices, event-loop, real-time, linux, macos

## Member repositories
- eclipse-vertx/vert.x (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:07.447565+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 2026-08-29T17:07:22.399625+00:00, confidence not recorded.
  - readme: https://github.com/eclipse-vertx/vert.x (fetched 2026-08-28T04:11:07.447565+00:00, sha 80f874b92b40)
  - homepage: https://vertx.io (fetched 2026-08-29T08:05:37.957382+00:00, sha 8b8a791960b9)
  - site_page: https://vertx.io/docs (fetched 2026-08-29T08:05:37.960149+00:00, sha 66a2c33946af)
  - site_page: https://vertx.io/docs/guides/vertx-5-migration-guide (fetched 2026-08-29T08:05:37.962278+00:00, sha 7fa0f7bd0a25)
  - site_page: https://vertx.io/docs/howtos/http-client-howto (fetched 2026-08-29T08:05:37.966353+00:00, sha 2f82448a311d)
- Data as of 2026-08-30T08:39:29.467469+00:00.