Lib.rs

Runtime Accelerated Rendering Infrastructure

rari is a high-performance React Server Components framework powered by a Rust runtime. Built for performance, scalability, and developer experience.

With proper app router support, true server-side rendering, and correct RSC semantics, rari delivers 8.7x higher throughput and 7.5x faster response times than Next.js.

Features

• App Router - File-based routing with layouts, loading states, and error boundaries
• True Server-Side Rendering - Pre-rendered HTML with instant hydration
• React Server Components - Server components by default, client components when you need them
• Rust-powered runtime - Persistent runtime for maximum performance
• Zero-config setup - Works out of the box with pre-built binaries
• Hot module reloading - Instant feedback during development
• Universal NPM package support - Use any npm package seamlessly
• TypeScript-first - Full type safety across server/client boundary
• Cross-platform - Supports macOS, Linux, and Windows
• Streaming SSR - Progressive rendering with Suspense boundaries
• Loading States - Automatic loading skeletons during navigation

Quick Start

Create a new rari application in seconds:

npm create rari-app@latest my-app
cd my-app
npm run dev

That's it! Your app will be running at http://localhost:5173.

Visit rari.build/docs for complete documentation, guides, and examples.

Documentation

Read the full documentation to learn more about:

• Getting started with rari
• App Router and file-based routing
• Server Components and Client Components
• Server Actions and data mutations
• Streaming SSR and Suspense
• Deployment and production optimization

Why rari?

Performance That Matters

• 7.5x faster response times - 0.35ms vs 2.64ms average response
• 8.7x higher throughput - 14,085 req/sec vs 1,624 req/sec under load
• 8.7x faster latency under load - 3.55ms vs 30.79ms average latency
• 53% smaller bundles - 266 KB vs 565 KB client JavaScript
• 2.9x faster builds - 1.41s vs 4.10s production builds

Developer Experience

• App Router - File-based routing with automatic code splitting
• Zero configuration - Create projects instantly with create-rari-app
• Hot module reloading - See changes instantly during development
• Full TypeScript support - Complete type safety across server/client boundary
• Correct RSC semantics - Server components by default, 'use client' for interactivity
• Cross-platform - Works on macOS, Linux, and Windows

Performance

rari delivers exceptional performance that significantly outperforms traditional React frameworks:

Head-to-Head Comparison vs Next.js

Benchmarks last updated: January 26, 2026

Response Time (Single Request):

Throughput Under Load (50 concurrent connections, 30s):

Build Performance:

All benchmarks are reproducible. See benchmarks/ for methodology and scripts.

Contributing

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

• Report Bugs - Found an issue? Open a bug report
• Suggest Features - Have ideas? Share your suggestions
• Improve Docs - Help make our documentation better
• Submit PRs - Check out our Contributing Guide

Community

• Discord - Join our community
• GitHub - Star the repo
• Documentation - rari.build/docs

License

MIT License - see LICENSE for details.