nexy 2.0.9

The Modern Fullstack Python Meta-Framework: Build high-performance web apps .

Nexy

Nexy is a modular, full-stack meta-framework designed to bridge the gap between FastAPI backends and Vite-powered frontend ecosystems such as React, Vue, Svelte, and Solid.js. Built on Python 3.10+, it enables the development of rich, interactive applications within a unified environment.

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Getting Started

Nexy leverages a streamlined workflow. The use of uv is recommended for optimal performance and dependency management.

1. Initialize Project

mkdir my_project && cd my_project
uv init && uv venv

2. Install and Initialize Nexy

uv add nexy && nexy init
# Alternative: pip install nexy && nexy init

3. Launch Development Server

nexy dev

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The .nexy Format (Server Components)

A .nexy or .mdx file serves as a Server Component. Internally, Nexy transforms these files into Python functions where the header contains the logic and the body defines the template.

---
# Python Logic Layer
title : prop[str] = "Nexy Component"

from "@/components/Card.nexy" import Card
from "@/components/Chart.tsx" import Chart
from "@/assets/data.json" as config
---
<!-- Jinja2 Template Layer (Server-Side Rendered) -->
<div class="p-6 bg-white rounded-xl shadow-lg">
    <h1>{{ title }}</h1>
    
    <!-- Nexy Server Component -->
    <Card content="Server-side rendered content" />
    
    <!-- Frontend Island (React/Vue/Svelte) -->
    <Chart data="{{ config }}" />
</div>

Core Features

• Typed Props: Properties are defined using the name : prop[type] syntax.
• Polyglot Imports: Direct import support for .nexy, .vue, .tsx, .svelte, .mdx, .py, .json, and image assets within the component header.
• Function Mapping: A file named users.nexy is automatically mapped to a Python function named Users().

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Routing Systems

Nexy provides two distinct routing strategies to accommodate different architectural requirements.

1. File-Based Routing

The directory structure within src/routes/ automatically generates the application's URL schema. This system supports .nexy, .mdx, and .py files.

File Path	URL	Resource Type
index.nexy	/	HTML Page
about.mdx	/about	Markdown Page
blog/[slug].nexy	/blog/:slug	Dynamic Page
api/users.py	/api/users	API Endpoint

API Route Definitions (.py)

API routes are defined by standard Python functions corresponding to HTTP methods:

def GET(slug: str):
    return {"message": f"Hello, {slug}"}

def POST():
    return {"status": "success"}

Dynamic Patterns

• [slug]: Standard dynamic parameter.
• [...slug]: Catch-all segments for deep nesting.
• name-[slug]: Prefixed dynamic parameters.
• (group): Organizational folders that do not affect the URL path.

2. Module-Based Routing

For enterprise-level architectures, Nexy offers a decorator-based approach inspired by modular frameworks like NestJS.

from nexy.decorators import Module, Controller

@Controller()
class AppController:
    def GET(self):
        return "Hello from Controller"

@Module()
class AppModule:
    controllers = [AppController]
    providers = []
    imports = []

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Nexy CLI (nx)

The nexy command-line interface (also accessible via the nx alias) manages the application lifecycle:

• nexy init: Initializes the project configuration, including framework selection and Tailwind CSS integration.
• nexy dev: Starts the development server with Hot Module Replacement (HMR) for both FastAPI and Vite.
• nexy build: Compiles and optimizes assets for production deployment.
• nexy start: Launches the production server.

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Technical Specifications

• Requirement: Python 3.10+ and Node.js environment.
• Backend: Built on FastAPI and Pydantic for high-performance data validation.
• Frontend: Powered by Vite for near-instant builds and modern ecosystem compatibility.
• Security: Automatic Jinja2 escaping and Pydantic-based prop validation to ensure architectural integrity.

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License

Distributed under the MIT License.