Runtime Accelerated Rendering Infrastructure

rari is a React Server Components framework running on a Rust runtime. It has three layers: a Rust runtime (HTTP server, RSC renderer, and router with embedded V8), a React framework (app router, server actions, streaming/Suspense), and a build toolchain (Rolldown-powered Vite bundling, tsgo type checking). You write standard React — the runtime underneath is Rust instead of Node.

With proper app router support, true server-side rendering, and correct RSC semantics, rari delivers 47.7x higher throughput and 9.8x faster response times than Next.js.

• 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 - HTTP server, RSC renderer, and routing written in Rust with embedded V8
• Zero-config setup - Works out of the box with pre-built binaries
• Hot module reloading - Instant feedback during development
• node_modules support - Standard npm package resolution, unlike most Rust-based JS runtimes
• 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

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.

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

• 9.8x faster response times - 0.08ms vs 0.78ms average response
• 47.7x higher throughput - 71,404 req/sec vs 1,497 req/sec under load
• 47.7x faster latency under load - 0.70ms vs 33.42ms average latency
• 56% smaller bundles - 281 KB vs 634 KB client JavaScript
• 2.9x faster builds - 1.26s vs 3.69s production builds

• 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

rari delivers exceptional performance that significantly outperforms traditional React frameworks:

Benchmarks last updated: March 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.

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

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

rari is made possible by the support of these companies:

Neon - Serverless Postgres. Autoscaling, branching, and scale to zero.

Interested in sponsoring rari? Get in touch or support us on GitHub Sponsors.

MIT License - see LICENSE for details.