netty/netty

Health v2 · maintenance only

Adoption not part of the score

35035 stars · 16272 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

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

framework · maturity stable

web-framework http-server http-client websocket networking middleware networking backend web-development developer-tools microservices jvm cross-platform nio async event-driven tcp udp protocol-servers high-performance io-uring ssl-tls linux macos

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