RustAPI

The power of Rust. Modern DX. LLM-ready.

Vision

RustAPI redefines API development for the AI era.

We combine Rust's performance and safety with FastAPI's ergonomics. Write type-safe, production-ready APIs without fighting trait bounds. MCP servers, LLM integrations, or classic REST APIs — one framework for all.

Philosophy

"API surface is ours, engines can change."

RustAPI follows a Facade Architecture — a stable, ergonomic public API that shields you from internal complexity and breaking changes.

Core Principles

Principle	What It Means
🎯 5-Line APIs	A working REST endpoint in 5 lines. No ceremony.
🛡️ Stable Surface	Your code depends on `rustapi-rs`. Internal crates (`hyper`, `tokio`, `validator`) are implementation details.
🔄 Engines Change	We can swap `hyper` for `h3`, upgrade `tokio`, or replace `validator` — your code stays the same.
🎁 Batteries Included	JWT, CORS, Rate Limiting, OpenAPI — all built-in, all optional via feature flags.
🤖 LLM-First	TOON format, token counting headers, MCP-ready. Built for the AI era.

Why This Matters

┌─────────────────────────────────────────────────────────────┐
│                    Your Application                          │
│                   use rustapi_rs::prelude::*                 │
├─────────────────────────────────────────────────────────────┤
│                     rustapi-rs (Facade)                      │
│              Stable API ── Never Breaks                      │
├───────────────┬───────────────┬───────────────┬─────────────┤
│ rustapi-core  │ rustapi-toon  │ rustapi-extras│ ...         │
│   (hyper)     │   (serde)     │    (jwt)      │             │
├───────────────┴───────────────┴───────────────┴─────────────┤
│              Foundation: tokio, serde, hyper                 │
│              ↑ Can be upgraded/swapped internally            │
└─────────────────────────────────────────────────────────────┘

Internal upgrades don't break your code. When hyper 2.0 releases, we update rustapi-core. Your RustApi::new() keeps working.

📚 Read more: docs/PHILOSOPHY.md | docs/ARCHITECTURE.md

use rustapi_rs::prelude::*;

#[rustapi_rs::get("/hello/{name}")]
async fn hello(Path(name): Path<String>) -> Json<Message> {
    Json(Message { greeting: format!("Hello, {name}!") })
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    RustApi::auto().run("0.0.0.0:8080").await
}

5 lines of code. Auto-generated OpenAPI docs. Production-ready.

🚀 Performance

RustAPI is blazingly fast — built on Tokio and Hyper 1.0, with zero-cost abstractions.

Benchmarks

Framework	Requests/sec	Latency (avg)	Memory
RustAPI	~185,000	~0.54ms	~8MB
Actix-web	~178,000	~0.56ms	~10MB
Axum	~165,000	~0.61ms	~12MB
Rocket	~95,000	~1.05ms	~15MB
FastAPI (Python)	~12,000	~8.3ms	~45MB

🔬 Test Configuration

Hardware: Intel i7-12700K, 32GB RAM
Method: wrk -t12 -c400 -d30s http://127.0.0.1:8080/api/users
Scenario: JSON serialization of 100 user objects
Build: cargo build --release

Results may vary based on hardware and workload. Run your own benchmarks:

cd benches
./run_benchmarks.ps1

Why So Fast?

⚡ Zero-copy parsing — Direct memory access for path/query params
🔄 Async-first — Tokio runtime handles 100K+ concurrent connections
📦 Smart caching — Route matching cached via radix tree (matchit)
🎯 No dynamic dispatch — All extractors resolved at compile time

Quick Start

[dependencies]
rustapi-rs = "0.1.4"

use rustapi_rs::prelude::*;

#[derive(Serialize, Schema)]
struct User { id: u64, name: String }

#[rustapi_rs::get("/users/{id}")]
async fn get_user(Path(id): Path<u64>) -> Json<User> {
    Json(User { id, name: "Tunahan".into() })
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    // Zero config: all `#[rustapi_rs::get/post/..]` routes are auto-registered.
    // Swagger UI is enabled at /docs by default (when built with the `swagger-ui` feature).
    RustApi::auto().run("127.0.0.1:8080").await
}

http://localhost:8080/docs → Swagger UI ready.

Features

Feature	Description
Type-Safe Extractors	`Json<T>`, `Query<T>`, `Path<T>`, `WebSocket` — compile-time guarantees
Zero-Config Routing	Macro-decorated routes auto-register at startup (`RustApi::auto()`)
Auto OpenAPI	Your code = your docs. `/docs` endpoint out of the box
Validation	`#[validate(email)]` → automatic 422 responses
JWT Auth	One-line auth with `AuthUser<T>` extractor
CORS & Rate Limit	Production-ready middleware
TOON Format	50-58% token savings for LLMs
WebSocket	Real-time bidirectional communication with broadcast support
Template Engine	Server-side HTML rendering with Tera templates
CLI Tool	`cargo-rustapi` for project scaffolding

Optional Features

rustapi-rs = { version = "0.1.4", features = ["jwt", "cors", "toon", "ws", "view"] }

jwt — JWT authentication
cors — CORS middleware
rate-limit — IP-based rate limiting
toon — LLM-optimized responses
ws — WebSocket support
view — Template engine (Tera)
full — Everything included

Examples

All examples in this repository are written in the Phase 6 “zero-config” style.

cargo run -p hello-world         # 5-line hello world
cargo run -p crud-api            # Full CRUD with validation
cargo run -p auth-api            # JWT authentication
cargo run -p sqlx-crud           # Database integration (PostgreSQL)
cargo run -p toon-api            # TOON format for LLMs
cargo run -p websocket           # Real-time WebSocket chat
cargo run -p templates           # Server-side rendering with Tera
cargo run -p mcp-server          # Model Context Protocol server
cargo run -p rate-limit-demo     # Rate limiting concepts
cargo run -p microservices       # Service-to-service communication
cargo run -p middleware-chain    # Middleware patterns
# cargo run -p graphql-api       # GraphQL (coming soon)

📚 Example Categories

🌟 Getting Started

hello-world — Minimal 5-line API
crud-api — Complete CRUD with in-memory storage
proof-of-concept — Feature showcase

🔐 Authentication & Security

auth-api — JWT authentication & authorization
rate-limit-demo — IP-based rate limiting
middleware-chain — Custom auth middleware

🗄️ Database Integration

sqlx-crud — PostgreSQL with SQLx
database-pooling — Connection pool management
redis-cache — Redis caching layer

🤖 AI & LLM

toon-api — TOON format for token optimization
mcp-server — Model Context Protocol integration
llm-streaming — Streaming LLM responses

🌐 Real-time & Web

websocket — WebSocket chat with broadcast
templates — Server-side HTML rendering
sse-events — Server-Sent Events

🏗️ Advanced Patterns

graphql-api — GraphQL with async-graphql
microservices — Multi-service architecture
grpc-integration — gRPC + REST hybrid

🔌 Real-time: WebSocket Support

RustAPI provides first-class WebSocket support for real-time applications.

use rustapi_rs::ws::{WebSocket, Message, Broadcast};

#[rustapi_rs::get("/ws")]
async fn websocket(ws: WebSocket) -> WebSocketUpgrade {
    ws.on_upgrade(handle_connection)
}

async fn handle_connection(mut stream: WebSocketStream) {
    while let Some(msg) = stream.recv().await {
        match msg {
            Message::Text(text) => {
                stream.send(Message::Text(format!("Echo: {}", text))).await.ok();
            }
            Message::Close(_) => break,
            _ => {}
        }
    }
}

Features:

Full WebSocket protocol support (text, binary, ping/pong)
Broadcast channel for pub/sub patterns
Seamless integration with RustAPI routing

🎨 Template Engine

Server-side HTML rendering with Tera templates.

use rustapi_rs::view::{Templates, View, ContextBuilder};

#[rustapi_rs::get("/")]
async fn home(templates: Templates) -> View<()> {
    View::new(&templates, "index.html", ())
}

#[rustapi_rs::get("/users/{id}")]
async fn user_page(templates: Templates, Path(id): Path<u64>) -> View<User> {
    let user = get_user(id);
    View::with_context(&templates, "user.html", user, |ctx| {
        ctx.insert("title", &format!("User: {}", user.name));
    })
}

Features:

Tera template engine (Jinja2-like syntax)
Type-safe context with ContextBuilder
Template inheritance support
Auto-escape HTML by default

🤖 LLM-Optimized: TOON Format

RustAPI is built for AI-powered APIs.

TOON (Token-Oriented Object Notation) uses 50-58% fewer tokens than JSON. Ideal for MCP servers, AI agents, and LLM integrations.

use rustapi_rs::toon::{Toon, LlmResponse, AcceptHeader};

// Direct TOON response
#[rustapi::get("/ai/users")]
async fn ai_users() -> Toon<UsersResponse> {
    Toon(get_users())
}

// Content negotiation: JSON or TOON based on Accept header
#[rustapi::get("/users")]
async fn users(accept: AcceptHeader) -> LlmResponse<UsersResponse> {
    LlmResponse::new(get_users(), accept.preferred)
}
// Headers: X-Token-Count-JSON, X-Token-Count-TOON, X-Token-Savings

Why TOON?

Compatible with Claude, GPT-4, Gemini — all major LLMs
Cut your token costs in half
Optimized for MCP (Model Context Protocol) servers

🛠️ CLI Tool: cargo-rustapi

Scaffold new RustAPI projects with ease.

# Install the CLI
cargo install cargo-rustapi

# Create a new project
cargo rustapi new my-api

# Interactive mode
cargo rustapi new my-api --interactive

Available Templates:

minimal — Basic RustAPI setup
api — REST API with CRUD operations
web — Full web app with templates and WebSocket
full — Everything included

Commands:

cargo rustapi new <name> — Create new project
cargo rustapi generate <type> — Generate handlers, models, middleware
cargo rustapi docs — Generate API documentation

Architecture

RustAPI follows a Facade Architecture — a stable public API that shields you from internal changes.

System Overview

graph TB
    subgraph Client["🌐 Client Layer"]
        HTTP[HTTP Request]
        LLM[LLM/AI Agent]
        MCP[MCP Client]
    end

    subgraph Public["📦 rustapi-rs (Public Facade)"]
        direction TB
        Prelude[prelude::*]
        Macros["#[rustapi::get/post]<br>#[rustapi::main]"]
        Types[Json, Query, Path, Form]
    end

    subgraph Core["⚙️ rustapi-core (Engine)"]
        direction TB
        Router[Radix Router<br>matchit]
        Extract[Extractors<br>FromRequest trait]
        MW[Middleware Stack<br>Tower-like layers]
        Resp[Response Builder<br>IntoResponse trait]
    end

    subgraph Extensions["🔌 Extension Crates"]
        direction LR
        OpenAPI["rustapi-openapi<br>Swagger/Docs"]
        Validate["rustapi-validate<br>Request Validation"]
        Toon["rustapi-toon<br>LLM Optimization"]
        Extras["rustapi-extras<br>JWT/CORS/RateLimit"]
        WsCrate["rustapi-ws<br>WebSocket Support"]
        ViewCrate["rustapi-view<br>Template Engine"]
    end

    subgraph Foundation["🏗️ Foundation Layer"]
        direction LR
        Tokio[tokio<br>Async Runtime]
        Hyper[hyper 1.0<br>HTTP Protocol]
        Serde[serde<br>Serialization]
    end

    HTTP --> Public
    LLM --> Public
    MCP --> Public
    Public --> Core
    Core --> Extensions
    Extensions --> Foundation
    Core --> Foundation

Request Flow

sequenceDiagram
    participant C as Client
    participant R as Router
    participant M as Middleware
    participant E as Extractors
    participant H as Handler
    participant S as Serializer

    C->>R: HTTP Request
    R->>R: Match route (radix tree)
    R->>M: Pass to middleware stack
    
    loop Each Middleware
        M->>M: Process (JWT, CORS, RateLimit)
    end
    
    M->>E: Extract parameters
    E->>E: Json<T>, Path<T>, Query<T>
    E->>E: Validate with #[validate]
    
    alt Validation Failed
        E-->>C: 422 Unprocessable Entity
    else Validation OK
        E->>H: Call async handler
        H->>S: Return response type
        
        alt TOON Enabled
            S->>S: Check Accept header
            S->>S: Serialize as TOON/JSON
            S->>S: Add token count headers
        else Standard
            S->>S: Serialize as JSON
        end
        
        S-->>C: HTTP Response
    end

Crate Dependency Graph

graph BT
    subgraph User["Your Application"]
        App[main.rs]
    end

    subgraph Facade["Single Import"]
        RS[rustapi-rs]
    end

    subgraph Internal["Internal Crates"]
        Core[rustapi-core]
        Macros[rustapi-macros]
        OpenAPI[rustapi-openapi]
        Validate[rustapi-validate]
        Toon[rustapi-toon]
        Extras[rustapi-extras]
        WS[rustapi-ws]
        View[rustapi-view]
    end

    subgraph External["External Dependencies"]
        Tokio[tokio]
        Hyper[hyper]
        Serde[serde]
        Utoipa[utoipa]
        Validator[validator]
        Tungstenite[tungstenite]
        Tera[tera]
    end

    App --> RS
    RS --> Core
    RS --> Macros
    RS --> OpenAPI
    RS --> Validate
    RS -.->|optional| Toon
    RS -.->|optional| Extras
    RS -.->|optional| WS
    RS -.->|optional| View
    
    Core --> Tokio
    Core --> Hyper
    Core --> Serde
    OpenAPI --> Utoipa
    Validate --> Validator
    Toon --> Serde
    WS --> Tungstenite
    View --> Tera

    style RS fill:#e1f5fe
    style App fill:#c8e6c9

Design Principles

Principle	Implementation
Single Entry Point	`use rustapi_rs::prelude::*` imports everything you need
Zero Boilerplate	Macros generate routing, OpenAPI specs, and validation
Compile-Time Safety	Generic extractors catch type errors at compile time
Opt-in Complexity	Features like JWT, TOON are behind feature flags
Engine Abstraction	Internal hyper/tokio upgrades don't break your code

Crate Responsibilities

Crate	Role
`rustapi-rs`	Public facade — single `use` for everything
`rustapi-core`	HTTP engine, routing, extractors, response handling
`rustapi-macros`	Procedural macros: `#[rustapi::get]`, `#[rustapi::main]`
`rustapi-openapi`	Swagger UI generation, OpenAPI 3.0 spec
`rustapi-validate`	Request body/query validation via `#[validate]`
`rustapi-toon`	TOON format serializer, content negotiation, LLM headers
`rustapi-extras`	JWT auth, CORS, rate limiting middleware
`rustapi-ws`	WebSocket support with broadcast channels
`rustapi-view`	Template engine (Tera) for server-side rendering

Roadmap

� Use Cases & Who's Using RustAPI

Perfect For:

🤖 AI/LLM APIs — MCP servers, token-optimized responses
🚀 Startups — Rapid prototyping with production-ready code
🏢 Microservices — Service-to-service communication
📱 Mobile Backends — Fast, type-safe REST APIs
🔄 Real-time Apps — WebSocket support built-in
📊 Data Platforms — High-performance data ingestion

Projects Using RustAPI

Building something with RustAPI? Add your project!

�🆚 Comparison with Other Frameworks

Feature	RustAPI	Axum	Actix-web	Rocket	FastAPI (Python)
Performance	⚡⚡⚡⚡⚡	⚡⚡⚡⚡	⚡⚡⚡⚡⚡	⚡⚡⚡	⚡
Learning Curve	📚📚	📚📚📚	📚📚📚📚	📚📚	📚
Auto OpenAPI	✅ Built-in	⚠️ Manual	⚠️ External	✅ Limited	✅ Built-in
Validation	✅ Automatic	⚠️ Manual	⚠️ Manual	✅ Basic	✅ Pydantic
JWT Auth	✅ Built-in	⚠️ External	⚠️ External	❌	⚠️ External
WebSocket	✅ Built-in	✅ Built-in	✅ Built-in	❌	✅ Built-in
LLM/TOON	✅ Unique	❌	❌	❌	❌
Zero Config	✅ `auto()`	⚠️ Manual	⚠️ Manual	⚠️ Manual	✅ Auto
Stability	✅ Facade	⚠️ Direct	⚠️ Direct	⚠️ Direct	✅ Stable
Async/Await	✅ Native	✅ Native	✅ Native	⚠️ Limited	✅ Native

Why Choose RustAPI?

🎯 5-Line APIs — Fastest time-to-production
🛡️ Facade Pattern — Internal upgrades don't break your code
🤖 AI-Ready — TOON format, MCP servers, LLM optimization
🎁 Batteries Included — JWT, CORS, Rate Limiting, OpenAPI — all built-in
📚 Better DX — FastAPI's ergonomics in Rust

🤝 Contributing

We welcome contributions! Here's how you can help:

⭐ Star this repo — Helps others discover RustAPI
🐛 Report bugs — Open an issue with reproduction steps
💡 Suggest features — Share your ideas in Discussions
📝 Improve docs — Fix typos, add examples
🔧 Submit PRs — See CONTRIBUTING.md

Development Setup

# Clone the repo
git clone https://github.com/Tuntii/RustAPI.git
cd RustAPI

# Run tests
cargo test --all

# Run benchmarks
cd benches && ./run_benchmarks.ps1

# Check formatting
cargo fmt --check

# Run clippy
cargo clippy --all-targets --all-features

📞 Community & Support

📖 Documentation: docs.rs/rustapi-rs
💬 Discussions: GitHub Discussions
🐦 Twitter: @Tuntii
🌐 Website: tunti35.com/projects/rustapi
📧 Email: tunahan@tunti35.com

⭐ Star History

If you find RustAPI useful, please consider giving it a star! It helps others discover the project.

License

MIT or Apache-2.0, at your option.

Name		Name	Last commit message	Last commit date
Latest commit History 85 Commits
.github		.github
assets		assets
benches		benches
crates		crates
docs		docs
examples		examples
.gitattributes		.gitattributes
.gitignore		.gitignore
CHANGELOG.md		CHANGELOG.md
CODE_OF_CONDUCT.md		CODE_OF_CONDUCT.md
CONTRIBUTING.md		CONTRIBUTING.md
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
LICENSE-APACHE		LICENSE-APACHE
LICENSE-MIT		LICENSE-MIT
README.md		README.md
SECURITY.md		SECURITY.md

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RustAPI

Vision

Philosophy

Core Principles

Why This Matters

🚀 Performance

Benchmarks

Why So Fast?

Quick Start

Features

Optional Features

Examples

📚 Example Categories

🔌 Real-time: WebSocket Support

🎨 Template Engine

🤖 LLM-Optimized: TOON Format

🛠️ CLI Tool: cargo-rustapi

Architecture

System Overview

Request Flow

Crate Dependency Graph

Design Principles

Crate Responsibilities

Roadmap

� Use Cases & Who's Using RustAPI

Perfect For:

Projects Using RustAPI

�🆚 Comparison with Other Frameworks

Why Choose RustAPI?

🤝 Contributing

Development Setup

📞 Community & Support

⭐ Star History

License

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