AsiJSBun-first Web Framework

Fast, type-safe, and simple. Built for Bun from the ground up.

🚀 Blazing Fast

Built on Bun's native HTTP server with a Trie-based router, ahead-of-time compilation, and zero-copy responses. Outperforms Express, Fastify, Hono, and Elysia.

🔒 Type-Safe

Full TypeScript inference with TypeBox validation. Schemas flow from server to client automatically — no code generation needed.

🔌 Plugin Ecosystem

CORS, JWT, OpenAPI/Swagger, Rate Limiting, Security Headers, WebSocket, JSX, MCP, and more — all built-in.

🧩 File-Based Routing

Drop route files into `src/routes/` — automatic registration with params, groups, and method suffixes.

🏢 Workspace Ready

Multi-app monorepo support with independent hot-reload. Each sub-app restarts only when its own files change.

📊 Production Observability

Built-in tracing (W3C traceparent), Prometheus/OTLP metrics export, structured logging, and cron scheduler.

Quick Example

typescript

import { Asi } from "asijs";

const app = new Asi();

app.get("/", () => "Hello, World!");
app.get("/user/:id", (ctx) => ({ id: ctx.params.id }));

app.group("/api", (api) => {
  api.get("/users", () => [{ name: "Alice" }, { name: "Bob" }]);
  api.post("/users", (ctx) => {
    const body = await ctx.json();
    return { created: body };
  });
});

app.listen(3000);

Benchmarks

AsiJS is designed for maximum performance:

Framework	Requests/sec	Latency
AsiJS (compiled)	~185,000	~0.05ms
AsiJS	~170,000	~0.06ms
Elysia	~155,000	~0.07ms
Hono	~140,000	~0.08ms
Fastify	~95,000	~0.11ms
Express	~25,000	~0.40ms

Benchmarks performed on Bun 1.3 with simple JSON response. Your mileage may vary.