HTeaLeaf 0.4.0

Declarative SSR Framework

🍃 HTeaLeaf

HTeaLeaf is a declarative web framework for Python — build dynamic, reactive web apps using pure Python, without writing templates or frontend JavaScript manually.

⚠️ Beta — HTeaLeaf is usable and the core API is stable, but you may encounter performance issues or unexpected bugs. Not recommended for production yet. Feedback and bug reports are very welcome.

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✨ Overview

HTeaLeaf merges ideas from modern frontend frameworks (React, Svelte, SolidJS) with the simplicity of Python web servers.

You declare HTML directly in Python, manage reactive state via Store objects, and HTeaLeaf takes care of keeping everything in sync automatically.

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🚀 Quick Example

from htealeaf import Store, SuperStore, HTeaLeaf
from htealeaf.elements import div, h3, button

app = HTeaLeaf()
SuperStore(app)

counter = Store({"count": 0})

@app.route("/")
def home():
    return div(
        button("-").attr(onclick=counter.js.update("count", -1)),
        h3(counter.react("count")),
        button("+").attr(onclick=counter.js.update("count", 1)),
    )

The class HTeaLeaf is the app and the entrypoint of ASGI. Next run

$ uvicorn my_app:app

Visit http://127.0.0.1:8000 a fully reactive counter, zero JavaScript written by hand.

You can also write client-side logic directly in Python using the @js decorator, and HTeaLeaf will compile it to JavaScript automatically:

from htealeaf.JS import js

@app.route("/hi")
def say_hi():
    @js
    def greet(event):
        console.log("hello from Python-compiled JS!")
    
    return button("Click me").attr(onclick=greet)

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✨ Key Features

• Declarative HTML: build DOM trees with a fluent Python DSL, no templates needed
• Reactive server state: Store objects stay in sync with the UI automatically
• Local route state: use_state() for state scoped to a single route
• Python → JS transpilation: write client-side logic in Python with @js; HTeaLeaf compiles it
• Session support: per-user state with AuthStore and cookies

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📦 Installation

pip install htealeaf

or

uv add htealeaf

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🗺️ Roadmap

• Declarative HTML DSL
• Path-based routing
• Server-side reactive state (Store, AuthStore)
• Python → JavaScript transpiler
• Local route state (use_state())
• Session support
• Client-side-only state (no server round-trip)
• Render optimisation
• Persistent Store backends (Redis, SQL, …)
• Async first architecture
• CLI
• Build system to static assets

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📖 Documentation

Full documentation is available in the wiki.

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🤝 Ecosystem

HTeaLeaf is part of a tea-themed open-source ecosystem by @Az107:

Project	Language	Description
HTeaPot	Rust	HTTP server — plays on HTTP 418 "I'm a teapot"
HTeaLeaf	Python	This framework — SSR with reactive state and JS transpilation
Cafetera	Rust	API mocker for testing, built on top of HTeaPot

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License

MIT License © 2026 — HTeaLeaf Framework. Made with 🍃 and Python.