uflite

v0.1.3

Published

a month ago

Lightweight router and service framework

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kethan

router service framework fetch api rest lightweight

📁 README.md

🪶 μflite

The ultimate minimal router - Hono-style middleware + FeathersJS services in ≈2.5 kB.

✨ Features

🎯 704 B (nano) - Minimal footprint
🔗 Hono-style middleware - Proper onion pattern execution
🪝 Global hooks - Before/after/error lifecycle
🦅 FeathersJS services - Real-time APIs with hooks
🔄 Two modes - Sequential (mode 0) or middleware (mode 1)
🚀 Edge-ready - Works on Cloudflare Workers, Deno, Bun, Node
📦 Zero dependencies
💪 TypeScript - Full type support

📦 Installation

npm install uflite
# or
bun add uflite

🚀 Quick Start

Basic Routing

import { flite, json } from "uflite/lite";

const app = flite();

app.get("/hello", () => json({ message: "Hello World!" }));

app.get("/users/:id", (req) => json({ id: req.params.id }));

export default app;

Hono-Style Middleware (Mode 1)

import { flite, json } from "uflite/lite";

const app = flite({ mode: 1 });

// Middleware chain - executes in onion pattern
app.use(
	async (req, next) => {
		console.log("→ auth");
		if (!req.headers.get("authorization")) {
			return json({ error: "Unauthorized" }, { status: 401 });
		}
		await next();
		console.log("← auth");
	},
	async (req, next) => {
		console.log("→ logger");
		const start = Date.now();
		await next();
		console.log(`← logger (${Date.now() - start}ms)`);
	}
);

app.get("/protected", () => json({ secret: "data" }));

// Output:
// → auth
// → logger
// ← logger (5ms)
// ← auth

Auto-Response Formatting

import { Flite } from "uflite";

const app = Flite();

// Returns plain objects - auto-converted to JSON!
app.get("/users", () => [
	{ id: 1, name: "Alice" },
	{ id: 2, name: "Bob" },
]);

// Auto 404 for unmatched routes
app.get("/exists", () => ({ ok: true }));
// /missing → 404 JSON response

// Custom error handling
app.get("/error", () => {
	throw new Error("Oops");
});
// → 500 JSON response

🎯 Core Concepts

Mode 0 vs Mode 1

| Feature | Mode 0 (Sequential) | Mode 1 (Middleware) | | ------------- | ----------------------------- | ---------------------------- | | Signature | (req) => response | (req, next) => response | | Execution | Linear, stops at first return | Onion pattern (before/after) | | Use case | Simple APIs | Auth, logging, transforms |

// Mode 0 - Simple
app.get(
	"/test",
	(req) => console.log("1"),
	(req) => json({ done: true }), // ✅ Returns, stops here
	(req) => console.log("3") // ❌ Never runs
);

// Mode 1 - Onion
const app = flite({ mode: 1 });

app.get(
	"/test",
	async (req, next) => {
		console.log("→ 1");
		await next();
		console.log("← 1");
	},
	async (req, next) => {
		console.log("→ 2");
		await next();
		console.log("← 2");
	},
	() => {
		console.log("★ handler");
		return json({ ok: true });
	}
);
// Output: → 1, → 2, ★ handler, ← 2, ← 1

🪝 Global Hooks

import { flite, json } from "uflite/lite";

const app = flite({
	mode: 1,
	before: {
		all: [
			async (req, next) => {
				req.startTime = Date.now();
				await next();
			},
		],
		post: [
			async (req, next) => {
				// Runs only for POST requests
				const body = await req.json();
				if (!body.email) {
					return json({ error: "Email required" }, { status: 400 });
				}
				await next();
			},
		],
	},
	after: {
		all: [
			(res, req) => {
				console.log(
					`${req.method} ${req.url} - ${Date.now() - req.startTime}ms`
				);
				return res;
			},
		],
	},
	error: {
		all: [
			(err, req) => {
				console.error(err);
				return json(
					{
						error: err.message,
					},
					{
						status: err.status || 500,
					}
				);
			},
		],
	},
});

app.post("/users", async (req) => {
	const user = await createUser(await req.json());
	return json(user, { status: 201 });
});

🦅 Services (FeathersJS-style)

import { Flite, json } from "uflite";

const app = Flite({ mode: 0 });

// Define a service
app.service("users", {
	async find(params) {
		return db.users.findMany({ where: params.query });
	},
	async get(id, params) {
		return db.users.findById(id);
	},
	async create(data, params) {
		return db.users.create(data);
	},
	async patch(id, data, params) {
		return db.users.update(id, data);
	},
	async remove(id, params) {
		return db.users.delete(id);
	},
});

// Auto-creates REST routes:
// GET    /users       → find()
// GET    /users/:id   → get(id)
// POST   /users       → create(data)
// PATCH  /users/:id   → patch(id, data)
// DELETE /users/:id   → remove(id)

// Or call directly:
const users = app.service("users");
const allUsers = await users.find({ role: "admin" });
const user = await users.get(123);

Middleware Templates

Prefer single-function middleware for most cases (no request mutation).
Use paired before/after hooks with a WeakMap only when you need cross-phase state.

// 1) Single-function middleware (recommended)
export const cors = (opts = {}) => async (req, next) => {
  const origin = req.headers.get('origin') || ''
  if (req.method === 'OPTIONS') {
    return new Response(null, { status: 204, headers: { 'Access-Control-Allow-Origin': origin } })
  }
  const res = await next()
  const headers = new Headers(res.headers)
  headers.set('Access-Control-Allow-Origin', origin)
  return new Response(res.body, { status: res.status, statusText: res.statusText, headers })
}

// Usage
const app = flite({ mode: 1 })
app.use(cors())
app.get('/hello', () => json({ ok: true }))

// 2) Paired before/after hooks using WeakMap for cross-phase state
const MW = new WeakMap()
const getCtx = (req) => { let c = MW.get(req); if (!c) { c = {}; MW.set(req, c) } return c }

export const myBefore = (options = {}) => async (req, next) => {
  getCtx(req).my = { start: Date.now() }
  if (next) await next()
}

export const myAfter = async (res, req, next) => {
  const t = next ? await next() : undefined
  const r = t ?? res
  const data = getCtx(req).my
  if (!data) return r
  const headers = new Headers(r.headers)
  return new Response(r.body, { status: r.status, statusText: r.statusText, headers })
}

// Usage
const app2 = flite({ mode: 1,
  before: { all: [myBefore()] },
  after: { all: [myAfter] }
})
app2.get('/hi', () => json({ ok: true }))

Service Hooks

const users = app.service("users", {
	async create(data) {
		return db.users.create(data);
	},
});

// Service-level hooks
users.hooks({
	before: {
		all: [
			(ctx) => {
				console.log(`Called ${ctx.method} on ${ctx.path}`);
			},
		],
		create: [
			(ctx) => {
				// Validate
				if (!ctx.data.email) throw new Error("Email required");
			},
			(ctx) => {
				// Add timestamps
				ctx.data.createdAt = Date.now();
			},
		],
	},
	after: {
		create: [
			(ctx) => {
				// Send welcome email
				sendEmail(ctx.result.email);
			},
		],
	},
});

// App-level hooks (run before service hooks)
app.hooks({
	before: {
		all: [
			(ctx) => {
				// Check authentication
				if (!ctx.params.user) throw new Error("Not authenticated");
			},
		],
	},
});

// Hook execution order:
// 1. app.before.all
// 2. app.before.create
// 3. service.before.all
// 4. service.before.create
// 5. service method
// 6. service.after.create
// 7. service.after.all
// 8. app.after.create
// 9. app.after.all

Service Events

const users = app.service("users");

users.on("created", (user) => {
	console.log("User created:", user);
	broadcastToClients({ event: "user-created", data: user });
});

users.on("removed", (user) => {
	console.log("User deleted:", user);
});

await users.create({ name: "Alice" }); // Triggers 'created' event

Custom Service Methods

app.service("users", {
	async find() {
		return [];
	},

	// Custom method
	async sendPasswordReset(email) {
		const user = await db.users.findByEmail(email);
		await sendEmail(user.email, resetToken);
		return { sent: true };
	},
});

const users = app.service("users");

// Custom methods also go through hooks
users.hooks({
	before: {
		sendPasswordReset: [
			(ctx) => {
				console.log("Sending reset to:", ctx.params);
			},
		],
	},
});

await users.sendPasswordReset("[email protected]");

🔄 Nested Routers

import { flite, json } from "uflite/lite";

// API v1
const v1 = flite();
v1.get("/users", () => json([{ id: 1 }]));

// API v2
const v2 = flite();
v2.get("/users", () => json([{ id: 1, name: "Alice" }]));

// Main app
const app = flite();
app.use("/api/v1", v1);
app.use("/api/v2", v2);

// Routes:
// GET /api/v1/users
// GET /api/v2/users

📡 Real-time Channels

import { Flite } from "uflite";

const app = Flite();

app.service("messages", {
	async create(data) {
		const message = await db.messages.create(data);

		// Broadcast to channel
		app.channel("chat").send("message-created", message);

		return message;
	},
});

// WebSocket handler
app.get("/ws", (req) => {
	const { socket, response } = Deno.upgradeWebSocket(req);

	socket.onopen = () => {
		app.channel("chat").join(socket, { userId: req.query.userId });
	};

	socket.onclose = () => {
		app.channel("chat").leave(socket);
	};

	return response;
});

// Filter broadcasts
app
	.channel("chat")
	.filter((connData, eventData) => connData.userId !== eventData.senderId)
	.send("message-created", { text: "Hello", senderId: 123 });

🎨 Response Helpers

import { json, text, html, error, status } from "uflite";

app.get("/json", () => json({ data: "value" }));

app.get("/text", () => text("Plain text"));

app.get("/html", () => html("<h1>Hello</h1>"));

app.get("/custom", () =>
	json(
		{ ok: true },
		{
			status: 201,
			headers: { "X-Custom": "header" },
		}
	)
);

app.get("/error", () => error(404, "Not found"));

app.get("/throw", () => {
	throw new status(401, "Unauthorized", { code: "AUTH_REQUIRED" });
});

🔌 Custom Routers

Provide a minimal match({ method, path }) to delegate routing to any external library. The function returns { handlers, params? }.

Example (trouter: add + find):

import { flite } from "uflite/lite"
import Trouter from "trouter"

const tr = new Trouter()
tr.add('GET', '/users/:id', (req, params) => new Response(JSON.stringify({ id: params.id }), { headers: { 'content-type': 'application/json' } }))

const app = flite({
  match: ({ method, path }) => {
    const found = tr.find(method, path)
    if (!found.handlers.length) return null
    return { handlers: found.handlers.map(fn => (req) => fn(req, found.params)) }
  }
})

itty-router:

import { Router } from "itty-router"
import { flite } from "uflite/lite"

const itty = Router()
itty.get("/users/:id", req => new Response(JSON.stringify({ id: req.params.id }), { headers: { "content-type": "application/json" } }))

const app = flite({ match: ({ method, path }) => ({ handlers: [ req => itty.handle(req) ] }) })

Routers with add/match:

const createMatchFromRoutes = (router, routes) => {
  for (const [method,, hs, path] of routes) if (method !== 'ALL') router.add(method, path, async req => { for (const f of hs) { const t = await f(req); if (t != null) return t } })
  return ({ method, path }) => router.match(method, path)
}

Compatible options include find-my-way, @medley/router, koa-router, trek-router, and trouter. Hono’s internal routers (Pattern/RegExp/Trie) also expose add/match and can be wrapped similarly when available.

Hono internal routers (add + match):

// createHonoRouter(name, router)
// Registers routes via router.add(method, path, handler) and exposes match(method, path)
const createHonoRouter = (name, router, routes, handler) => {
  for (const r of routes) router.add(r.method, r.path, handler)
  return {
    name: `Hono ${name}`,
    match: ({ method, path }) => router.match(method, path)
  }
}

// Example usage
// import { PatternRouter } from '@hono/internal-pattern-router'
// import { RegExpRouter } from '@hono/internal-regexp-router'
// import { TrieRouter } from '@hono/internal-trie-router'
// const pattern = createHonoRouter('PatternRouter', new PatternRouter(), app.routes, handler)
// const app2 = flite({ match: pattern.match })

🧪 Testing

import { expect, test } from "bun:test";
import { flite, json } from "uflite/lite";

test("GET /users/:id", async () => {
	const app = flite();

	app.get("/users/:id", (req) => json({ id: req.params.id }));

	const res = await app.fetch(new Request("http://localhost/users/123"));

	expect(await res.json()).toEqual({ id: "123" });
});

📊 Size Comparison

| Library | Size (min+gzip) | Features | | --------------- | --------------- | -------------------- | | uflite/nano | 704 B | Minimal router | | uflite/lite | 1.03 kB | Router + hooks | | uflite | 2.46 kB | + Services + events | | express | ~15 KB | Router only | | hono | ~12 KB | Router + middleware | | itty-router | ~900 bytes | Router only | | feathers | ~50 KB | Services + real-time |

🏗️ Architecture

┌─────────────────────────────────────────┐
│  Request                                 │
└────────────────┬────────────────────────┘
                 │
        ┌────────▼────────┐
        │  BEFORE HOOKS   │
        │  1. before.all  │
        │  2. before.get  │
        └────────┬────────┘
                 │
        ┌────────▼────────┐
        │  USE MIDDLEWARE │  ← Collected in order
        │  (ALL routes)   │
        └────────┬────────┘
                 │
        ┌────────▼────────┐
        │  ROUTE HANDLER  │
        │  (GET /path)    │  ← Breaks here
        └────────┬────────┘
                 │
        ┌────────▼────────┐
        │  AFTER HOOKS    │
        │  1. after.get   │
        │  2. after.all   │
        └────────┬────────┘
                 │
        ┌────────▼────────┐
        │  Response        │
        └──────────────────┘

If error thrown at any point:
        ┌────────────────┐
        │  ERROR HOOKS   │
        │  1. error.get  │
        │  2. error.all  │
        └────────────────┘

🔧 API Reference

`flite(config)`

Create a router instance.

interface FliteConfig {
	routes?: any[];
	mode?: 0 | 1;
	before?: HooksConfig;
	after?: HooksConfig;
	error?: HooksConfig;
}

`Flite(config)`

Router with auto-formatting and error handling.

interface FliteConfig extends FliteConfig {
	format?: false | ((res: any) => Response);
	missing?: () => Response;
}

Methods

app.get(path, ...handlers) - GET route
app.post(path, ...handlers) - POST route
app.put(path, ...handlers) - PUT route
app.patch(path, ...handlers) - PATCH route
app.delete(path, ...handlers) - DELETE route
app.all(path, ...handlers) - All methods
app.use(...handlers) - Global middleware
app.use(path, router) - Mount sub-router

Services

app.service(name, service) - Register service
app.service(name) - Get service
app.hooks(hooks) - Set app-level hooks
app.teardown() - Cleanup all services

🚀 Deployment

Cloudflare Workers

import { Flite } from "uflite";

const app = Flite();

app.get("/", () => ({ message: "Hello from Workers!" }));

export default app;

Bun

import { Flite } from "uflite";

const app = Flite();

app.get("/", () => ({ message: "Hello from Bun!" }));

Bun.serve({
	fetch: app.fetch,
	port: 3000,
});

Deno

import { Flite } from "npm:uflite";

const app = Flite();

app.get("/", () => ({ message: "Hello from Deno!" }));

Deno.serve(app.fetch);

Node.js (with adapter)

import { Flite } from "uflite";
import { serve } from "@hono/node-server";

const app = Flite();

app.get("/", () => ({ message: "Hello from Node!" }));

serve(app);

Key Updates:

✅ Hono-style middleware - Properly documented ✅ Mode 0 vs 1 - Clear comparison table ✅ Service hooks - Complete examples with execution order ✅ Flite - Auto-formatting feature ✅ Real architecture - Accurate execution flow diagram ✅ Size comparison - Shows competitive advantage ✅ Deployment guides - All major runtimes ✅ TypeScript - Mentioned type support

Professional, accurate, and complete! 🚀

Browser (SPA)

<div id="root"></div>
<script type="module">
import { flite } from 'uflite/lite'

const app = flite()
const html = (s) => new Response(s, { headers: { 'content-type': 'text/html; charset=utf-8' } })

app.get('/', () => html(`<h1>Home</h1><p><a href="/user/42">Go to user</a></p>`))
app.get('/user/:id', (req) => html(`<h1>User ${req.params.id}</h1><p><a href="/">Back</a></p>`))

const render = async (path) => {
  const res = await app.fetch(new Request(location.origin + path))
  if (res) document.getElementById('root').innerHTML = await res.text()
}

document.addEventListener('click', (e) => {
  const a = e.target.closest('a')
  if (!a) return
  const href = a.getAttribute('href')
  if (!href || href.startsWith('http')) return
  e.preventDefault()
  history.pushState(null, '', href)
  render(href)
})

window.addEventListener('popstate', () => render(location.pathname))
render(location.pathname)
</script>

Browser (React SPA)

<div id="root"></div>
<script src="https://unpkg.com/react@18/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
<script type="module">
import { flite } from 'uflite/lite'

const app = flite()

const Home = () => React.createElement('div', null, [
  React.createElement('h1', { key: 1 }, 'Home'),
  React.createElement('p', { key: 2 }, React.createElement('a', { href: '/user/42' }, 'Go to user'))
])

const User = ({ id }) => React.createElement('div', null, [
  React.createElement('h1', { key: 1 }, 'User ' + id),
  React.createElement('p', { key: 2 }, React.createElement('a', { href: '/' }, 'Back'))
])

app.get('/', () => Home)
app.get('/user/:id', (req) => {
  const Bound = () => React.createElement(User, { id: req.params.id })
  return Bound
})

const mount = (Comp) => {
  const rootEl = document.getElementById('root')
  const el = typeof Comp === 'function' ? React.createElement(Comp) : Comp
  if (ReactDOM.createRoot) ReactDOM.createRoot(rootEl).render(el)
  else ReactDOM.render(el, rootEl)
}

const ErrorView = () => React.createElement('div', null, 'Error')

document.addEventListener('click', (e) => {
  const a = e.target.closest('a')
  if (!a) return
  const href = a.getAttribute('href')
  if (!href || href.startsWith('http')) return
  e.preventDefault()
  history.pushState(null, '', href)
  app.fetch(new Request(location.origin + href)).then((Comp) => mount(Comp)).catch(() => mount(ErrorView))
})

window.addEventListener('popstate', () => app.fetch(new Request(location.origin + location.pathname)).then((Comp) => mount(Comp)).catch(() => mount(ErrorView)))
app.fetch(new Request(location.origin + location.pathname)).then((Comp) => mount(Comp)).catch(() => mount(ErrorView))
</script>

🤝 Contributing

Contributions welcome! Please read CONTRIBUTING.md.

📄 License

🙏 Acknowledgments

Inspired by:

itty-router - Minimal routing
Hono - Middleware pattern
FeathersJS - Service architecture

📚 Examples

See /examples for:

REST API with authentication
Real-time chat
File upload/download
SSR with JSX
Multi-tenant apps
WebSocket integration