boazsegev/facil.io

Health v2 · maintenance only

Adoption not part of the score

2400 stars · 151 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

facil.io is a high-performance C micro-framework for web applications, providing an evented HTTP/1.1, WebSocket, and SSE server with pub/sub, optional Redis clustering, JSON parsing, Mustache templating, and TLS 1.3 support. Its 0.8.x line is being reorganized as fio-stl, a single-header C STL with an IO reactor, parsers, and cryptographic toolkit usable from C or C++.

Use cases

• build a high performance http server in c
• write websocket applications in c
• handle 10k concurrent connections in c
• add pub/sub messaging with redis to a c app
• parse json in c without dependencies
• embed an evented network server in a c or c++ project
• power a ruby application server with http and websockets

When to choose

• you need a fast, evented HTTP/WebSocket server in C or C++ with minimal dependencies
• you want built-in pub/sub, JSON, TLS 1.3, and crypto in one library
• you're building or serving a Ruby app via the Iodine server
• you need a single-header C STL with IO, parsers, and memory-safe utilities

When to avoid

• you want a batteries-included web framework with routing, ORM, and middleware ecosystems
• your team is not comfortable developing in C
• you need Windows as a first-class production target (historically Linux/BSD/macOS focused)
• you prefer managed languages or runtimes over low-level systems programming

Facets

framework · maturity active

web-framework http-server websocket serialization json caching networking cryptography templating cli web-development backend networking developer-tools windows bsd cross-platform c cpp ruby evented-io http1-1 server-sent-events pub-sub redis c10k single-header tls-1-3 micro-framework tcp-ip real-time linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="boazsegev/facil.io")