# netty/netty

Netty project - an event-driven asynchronous network application framework

Repository: https://github.com/netty/netty
Canonical: https://ross.abutalabs.com/products/netty
Homepage: http://netty.io
Language: Java
License: Apache-2.0
License Family: permissive
Last push: 2026-08-26T14:38:16+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 96, longevity 100
- inputs: {"age_days": 5776, "days_push": 7, "days_rel": 27, "gap_med": 1.0, "n_releases_24m": 13}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 35035, forks 16272 (observed 2026-08-28T04:12:00.723763+00:00)

## What it is
Netty is an asynchronous event-driven network application framework for the JVM, enabling rapid development of high-performance protocol servers and clients. It provides a unified API over blocking and non-blocking transports (including native epoll, kqueue, and io_uring) with SSL/TLS, HTTP, and WebSocket support.

## Use cases
- build a high-performance TCP or UDP server in Java
- write a custom binary protocol client and server
- implement an HTTP or WebSocket server with low latency
- handle thousands of concurrent network connections efficiently
- add TLS/StartTLS to a custom network protocol
- build a lightweight HTTP client without heavy dependencies

## When to choose
- you need fine-grained control over networking on the JVM with maximum throughput and low latency
- you are implementing a custom protocol or a high-performance proxy/server
- you want a mature, battle-tested NIO framework with extensive documentation and examples

## When to avoid
- you just need a simple REST API - use a higher-level framework like Spring Boot or Javalin instead
- you are not on the JVM
- your team is unfamiliar with asynchronous, event-driven programming and the project is simple

## Facets
- artifact type: framework
- maturity: stable
- function: web-framework, http-server, http-client, websocket, networking, middleware
- domain: networking, backend, web-development, developer-tools, microservices
- platform: jvm, cross-platform
- tags: nio, async, event-driven, tcp, udp, protocol-servers, high-performance, io-uring, ssl-tls, linux, macos

## Member repositories
- netty/netty (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:12:00.723763+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 2026-08-29T16:27:11.803661+00:00, confidence not recorded.
  - readme: https://github.com/netty/netty (fetched 2026-08-28T04:12:00.723763+00:00, sha fd17e386547d)
  - homepage: http://netty.io (fetched 2026-08-29T07:48:05.943417+00:00, sha ba5dbb750906)
  - site_page: https://netty.io/wiki/index.html (fetched 2026-08-29T07:48:05.952490+00:00, sha f6badc332c73)
- Data as of 2026-08-30T08:39:29.467469+00:00.