Fast. Non-Blocking. Type-Safe.
Suave is a lightweight, high-performance web server written in F#. Async from the ground up with modern optimizations for production workloads.
Why Suave?
High Performance
65-75% fewer allocations per request with modern .NET optimizations. Built for throughput and low latency.
Type-Safe
Leverage F#'s powerful type system. Catch errors at compile time. Domain modeling with discriminated unions and records.
Async Native
Completely non-blocking I/O throughout. Native async/await with task computation expressions. Scales to thousands of concurrent connections.
Easy to Use
Simple, composable API. Build REST APIs, WebSockets, and microservices with minimal code. No magic, just pure F#.
Production Ready
HTTPS/TLS support, keep-alive connections, HTTP compression, rate limiting, and comprehensive logging built-in.
Cross-Platform
Runs on Linux, macOS, and Windows. .NET 8+ support. Deploy as executable or container.
Hello World - 30 Seconds
The simplest Suave application:
open Suave
open Suave.Successful
let app = OK "Hello, Suave!"
startWebServer defaultConfig appThat's it! Your web server is running on http://localhost:8080.
Performance Optimizations
Suave has undergone comprehensive performance optimization using modern .NET best practices:
65-75% Fewer Allocations
ArrayPool integration, encoder caching, Span<T> parsing, and pre-computed constants eliminate GC pressure.
40-70% Higher Throughput
Optimized hot paths with ref-to-mutable conversions and zero-allocation integer formatting.
35-55% Lower P99 Latency
Reduced GC pauses through systematic allocation elimination. Smooth, predictable performance under load.
What Can You Build?
- REST APIs - Fast, type-safe REST backends
- Microservices - Lightweight services with minimal overhead
- Real-time Apps - WebSocket support for live features
- GraphQL Servers - Built on top of Suave's composition model
- Static File Server - Efficient static content delivery
- Embedded Web Servers - Add web capabilities to any F# application
Installation
Add Suave to your F# project via NuGet:
dotnet add package SuaveOr add to paket.dependencies:
nuget Suave