# Actix

> Actix Rust web framework with actors and high performance. Use for Rust APIs.

- Skill: `g1joshi/actix` (Agent Skill)
- Install (CLI): `npx skillmds@latest add g1joshi/actix`
- Raw SKILL.md: https://api.skillmd.com/api/skills/g1joshi/actix/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: G1Joshi (https://skillmd.com/u/g1joshi)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/g1joshi/actix

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# Actix Web

Actix Web is one of the fastest web frameworks in the world (TechEmpower benchmarks). It uses the **Actor Model** (though less visible in v4) for concurrency.

## When to Use

- **Raw Speed**: When req/sec is the primary metric.
- **Microservices**: Low footprint, high throughput services.
- **WebSockets**: Efficient handling of millions of connections (actix-web-actors).

## Core Concepts

### App Factory

`App::new()` is a factory called for each thread. State must be wrapped in `web::Data`.

### Extractors

Similar to Axum, but uses `web::Json`, `web::Path`.

### Actors (Actix)

The underlying system for async messages (optional in simple web apps but heavily used for WebSockets).

## Best Practices (2025)

**Do**:

- **Use `web::Data`**: For shared application state (DB pools).
- **Use `actix_web::main`**: The macro to run the async runtime.

**Don't**:

- **Don't block the thread**: Actix is single-threaded per worker. Blocking operations stop the world.

## References

- [Actix Web Documentation](https://actix.rs/)