Make devserver backend health check endpoint configurable, preserved in upgrades and optional.

README.md

@@ -1,137 +1,96 @@
 # fastapi-vue-setup
 
-Tool to create or patch FastAPI project with a Vue frontend, with integrated build and development systems. The Python package will not need any JS runtime because it includes a prebuilt Vue frontend in it. For development (Vite and FastAPI auto reloads) and building the package one of npm, deno or bun is required (node is recommended due to bugs in deno and bun).
+Create or patch a FastAPI + Vue project with an integrated dev/build workflow.
 
-## Features
+- Development: one command runs Vite + FastAPI (reloads)
+- Production: `uv build` bakes the built Vue assets into the Python package (no Node/JS runtime needed to *run* the installed package)
 
-- **No JavaScript**: Your Python package can be installed and used without any JS runtime
-- **Integrated build system**: Vue frontend builds into Python package during `uv build`
-- **Development server**: Single command runs Vite + FastAPI with hot-reload
-- **Optimized static serving**: Caching, zstd compression and SPA support
+## Quick start
 
-## Installation
+Install [UV](https://docs.astral.sh/uv/) and any JS runtime (node, deno, or bun).
 
-Install [uv](https://docs.astral.sh/uv/getting-started/installation/), then:
+This README uses `my-app` as the example project name:
 
-```sh
-uv tool install fastapi-vue-setup
-fastapi-vue-setup --help
-```
+- project directory: `my-app/`
+- Python module: `my_app`
+- env prefix: `MY_APP`
+- CLI command: `my-app`
 
-Or run directly:
+Create a new project in `./my-app`:
 
 ```sh
 uvx fastapi-vue-setup my-app
 ```
 
-## Usage
+Once in your source tree, you will typically use `.` for the path. If there is an existing project, `fastapi-vue-setup` will do its best to find and patch a backend module and create or patch a Vue project in `frontend/`. The integration can be upgraded by running a new version of `fastapi-vue-setup` on it, preserving earlier default ports and user customizations.
 
-The script may be used to create an all new project folder or to patch or update an existing project to use this framework. It autodetects the project folder given and performs the appropriate actions.
+## In your project
 
-### Create a new project
+ℹ️ Everything below is meant to be run within your project source tree.
+
+The setup creates a CLI entry for your package, so that it becomes a command to run, not a Python module nor `fastapi myapp...`. The CLI main can be customized, although --listen should be kept for devserver compatibility.
+
+You can choose the JS runtime with environment `JS_RUNTIME` (e.g. `node`, `deno`, `bun`, or path to one). This is used by the build and the devserver scripts. By default any available runtime on the system is chosen.
+
+### Development server (Vite + FastAPI)
 
 ```sh
-fastapi-vue-setup my-app
+uv run scripts/devserver.py [args]
 ```
 
-This will:
+ℹ️ Arguments are forwarded to the main CLI, except that `--listen` controls where Vite listens, and `--backend` is passed to main CLI as `--listen`.
 
-1. Run `uv init my-app`
-2. Run `create-vue frontend` (interactive - choose your Vue options)
-3. Patch the project with FastAPI integration
-4. Install dependencies via `uv add`
+### Production
 
-### Patch an existing project
-
-You should have your pyproject.toml at the current working directory, and Vue with its package.json under `frontend/`. If either one is missing, new applications will be initialised. Otherwise we only patch what can be patched without breaking your existing projects.
+Build the Python package (this compiles the Vue frontend) and run the production server:
 
 ```sh
-fastapi-vue-setup .
+uv build && uv run my-app [args]
 ```
 
-### CLI Options
+Once happy with it, publish the package
 
-```
-fastapi-vue-setup [project-dir] [options]
-
-Options:
-  --module-name NAME    Python module name (auto-detected from pyproject.toml)
-  --dry-run             Preview changes without modifying files
+```sh
+uv build && uv publish
 ```
 
-## Port Configuration
+Afterwards, you can easily run it anywhere, no JS runtimes required:
 
-In development, you access the Vite dev server at `http://localhost:5173`. Vite proxies `/api/*` requests to FastAPI at port 5180. Ports and hosts of Vite and FastAPI are configurable by `devserver.py` arguments.
-
-In production, FastAPI serves both the API and static files at `http://localhost:5080`. Configurable by `host:port` argument with defaults set in `__main__.py`
-
-## Main CLI
-
-If your project didn't already have `__main__.py`, we create one that runs the FastAPI app with richer configuration than what the FastAPI CLI offers. Running your module starts it in production mode, and optionally host:port may be given as argument to specify where it listens.
-
-If you are running behind a reverse proxy like [Caddy](https://caddyserver.com/) on localhost, your app will trust the proxy headers it sends. However, if you need to configure another proxy host or IP, set `FORWARDED_ALLOW_IPS` env variable before running the server.
-
-The devserver script depends on this CLI entry for running the backend. You will have to modify the `devserver.py` script if your app has its own incompatible main module. Note that we set FastAPI debug mode and Uvicorn reload when configured via `FASTAPI_VUE_BACKEND_URL` env variable (set by `devserver.py`), while for normal production use these stay disabled. The same variable also controls static files serving (disabled in dev mode).
-
-
-## Vite Plugin Configuration
-
-The `fastapiVue()` plugin in `vite.config.ts` accepts options to customize proxy behavior:
-
-```js
-import fastapiVue from "./vite-plugin-fastapi.js";
-
-export default defineConfig({
-  plugins: [
-    vue(),
-    // Default: proxies only /api
-    fastapiVue(),
-
-    // Or specify custom paths to proxy to backend
-    fastapiVue({ paths: ["/api", "/auth", "/ws"] }),
-  ],
-});
+```sh
+uvx my-app [args]
 ```
 
-The plugin reads environment `FASTAPI_VUE_BACKEND_URL` (default: `http://localhost:5180`) to determine where to proxy requests. This is set automatically by `devserver.py`.
+ℹ️ Instead of `uvx` you may consider `uv tool install`, oldskool `pip install` or whatever best suits you.
 
-## Project Structure
+### Vite plugin
+
+The generated Vite plugin lives in `frontend/vite-plugin-fastapi.js` and defaults to proxying `/api`.
+
+It reads `MY_APP_BACKEND_URL` to know where to proxy; if unset it falls back to your configured default backend port.
+
+## Project layout (typical)
 
 ```
 my-app/
-├── frontend/                 # Vue application
+├── frontend/                    # Vue app (Vite)
 │   ├── src/
 │   ├── vite-plugin-fastapi.js
-│   ├── vite.config.js
 │   └── package.json
-├── my_app/                   # Python module (files included in sdist)
-│   ├── __init__.py
-│   ├── __main__.py           # CLI entrypoint
-│   ├── app.py                # FastAPI application
-│   └── frontend-build/       # Built frontend (gitignored)
-├── scripts/
-│   ├── devserver.py          # CLI dev server (only in source tree)
-│   └── fastapi-vue/
-│       ├── build-frontend.py
-│       └── util.py
-└── pyproject.toml
+├── my_app/                      # Python package
+│   ├── __main__.py              # CLI entrypoint
+│   ├── app.py                   # FastAPI app
+│   └── frontend-build/          # built assets (included in distributions)
+├── pyproject.toml
+└── scripts/
+    ├── devserver.py             # Run Vite and FastAPI together in dev mode
+    └── fastapi-vue/             # Dev utilities (only on the source tree)
+        ├── build-frontend.py
+        ├── buildutil.py
+        └── devutil.py
 ```
 
-The project directory tree looks roughly like this after project creation or patching. The script finds your existing app module and other files and patches them with minimal changes to enable the Vue-FastAPI interconnection. New Python and Vue projects are created automatically if none exist.
+## The fastapi-vue runtime module
 
-## Development Workflow
+The backend runs the FastAPI app and serves the frontend build using the companion package in [fastapi-vue/README.md](fastapi-vue/README.md). Your project will depend on Fastapi and this lightweight module.
 
-```bash
-# Start dev server (runs both Vite and FastAPI)
-uv run scripts/devserver.py
-
-# Build for production
-uv build
-
-# Run production server
-uv run my-app
-```
-
-## Frontend serving
-
-Your FastAPI app will use [fastapi-vue](https://git.zi.fi/LeoVasanko/fastapi-vue) to serve the frontend files. Refer to that package's documentation for further configuration.
+ℹ️ Development functionality is in `scripts/fastapi-vue/` directly in your source tree, and is not to be confused with this runtime module. Only the runtime is installed with your package.

fastapi-vue/README.md

@@ -1,29 +1,25 @@
 # fastapi-vue
 
-Implements Single-Page-App serving at site root with FastAPI, that the standard StaticFiles module cannot handle. This also caches and zstd compresses the files for lightning-fast operation. This is primarily meant for use with Vue frontend, but technically can host any static files in a similar manner.
+Runtime helpers for FastAPI + Vite/Vue projects.
 
-## Installation
+## Overview
 
-Script [fastapi-vue-setup](https://git.zi.fi/LeoVasanko/fastapi-vue-setup) should normally be used to convert or create a project with connection between FastAPI and Vue. The target project will depend on this package to serve its static files.
+This package provides:
 
-```sh
-uvx fastapi-vue-setup --help
-```
+- `fastapi_vue.Frontend`: serves built SPA assets (with SPA support, caching, and optional zstd)
+- `fastapi_vue.server.run`: a small Uvicorn runner with convenient `listen` endpoint parsing
 
-Refer to instructions below for further configuration.
+## Quickstart
 
-## Usage
+Serve built frontend assets from `frontend-build/`:
 
 ```python
+from pathlib import Path
 from contextlib import asynccontextmanager
 from fastapi import FastAPI
 from fastapi_vue import Frontend
 
-frontend = Frontend(
-    Path(__file__).with_name("frontend-build"),
-    spa=True,
-    cached=["/assets/"],
-)
+frontend = Frontend(Path(__file__).with_name("frontend-build"), spa=True)
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
@@ -38,10 +34,35 @@ app = FastAPI(lifespan=lifespan)
 frontend.route(app, "/")
 ```
 
-## Configuration
+## Frontend
 
-- `directory`: Path to static files directory
-- `spa`: Enable SPA mode (serve index.html for unknown routes)
-- `cached`: Path prefixes for immutable cache headers (browser won't check for changes)
-- `favicon`: Path to serve at `/favicon.ico` (e.g., `"/logo.png"` will be served as `image/png`)
+`Frontend` serves a directory with:
+
+- RAM caching, with zstd compression when smaller than original
+- Browser caching: ETag + Last-Modified, Immutable assets
+- Favicon mapping (serve PNG or other images there instead)
+- SPA routing (serve browsers index.html at all paths not otherwise handled)
+
+Dev-mode behavior with `FastAPI(debug=True)`: requests error HTTP 409 with a message telling you to use the Vite dev server instead. Avoids accidentally using outdated `frontend-build` during development.
+
+- `directory`: Path on local filesystem
+- `index`: Index file name (default: `index.html`)
+- `spa`: Serve index at any path (default: `False`)
+- `catch_all`: Register a single catch-all handler instead of a route to each file; default for SPA
+- `cached`: Path prefixes treated as immutable (default: `/assets/`)
+- `favicon`: Optional path or glob (e.g. `/assets/logo*.png`)
 - `zstdlevel`: Compression level (default: 18)
+
+ℹ️ Even when your page has a meta tag giving favicon location, browsers still try loading `/favicon.ico` whenever looking at something else. We find it more convenient to simply serve the image where the browser expects it, with correct MIME type. This also allows having a default favicon for your application that can be easily overriden at the reverse proxy (Caddy, Nginx) to serve the company branding if needed in deployment.
+
+## Server runner
+
+When you need more flexibility than `fastapi` CLI can provide (e.g. CLI arguments to your own program), you may use this convenience to run FastAPI app with Uvicorn startup on given `listen` endpoints. Runs in the same process if possible but delegates to `uvicorn.run()` for auto-reloads and multiple workers. This would typically be called from your CLI main, which can set its own env variables to pass information to the FastAPI instances that run (Python imports only work in same-process mode).
+
+```python
+from fastapi_vue import server
+
+server.run("my_app.app:app", listen=["localhost:8000"])
+```
+
+- As a deployment option, environment `FORWARDED_ALLOW_IPS` controls `X-Forwarded` trusted IPs (default: `127.0.0.1,::1`).

fastapi-vue/fastapi_vue/hostutil.py

@@ -12,6 +12,7 @@ def parse_endpoint(value: str | None, default_port: int = 0) -> list[dict]:
 
     Returns:
         List of dicts with uvicorn bind kwargs (host/port or uds).
+        Two entries may be returned for IPv4 and IPv6 (all interaces).
 
     Supported forms:
     - None or empty -> [{host: "localhost", port: default_port}]
@@ -65,3 +66,19 @@ def parse_endpoint(value: str | None, default_port: int = 0) -> list[dict]:
         ipaddress.ip_address(host)
 
     return [{"host": host, "port": port}]
+
+
+def parse_endpoints(
+    listen: str | list[str] | None = None, default_port: int = 8000
+) -> list[dict]:
+    """Parse listen strings into a list of endpoint dicts.
+
+    Args:
+        listen: Endpoint string(s) (see parse_endpoint for formats).
+        default_port: Port to use when not specified in listen args.
+    """
+    if listen is None:
+        listen = [f"localhost:{default_port}"]
+    elif isinstance(listen, str):
+        listen = [listen]
+    return [ep for s in listen for ep in parse_endpoint(s, default_port)]

fastapi-vue/fastapi_vue/server.py

@@ -6,7 +6,7 @@ from contextlib import suppress
 import uvicorn
 from uvicorn import Config, Server
 
-from .hostutil import parse_endpoint
+from .hostutil import parse_endpoints
 
 logger = logging.getLogger(__name__)
 
@@ -30,13 +30,9 @@ def run(
         workers: Number of worker processes (requires uvicorn.run, single endpoint only).
         **uvicorn_config: Additional uvicorn config options (overrides all other settings).
     """
-    if listen is None:
-        listen = [f"localhost:{default_port}"]
-    elif isinstance(listen, str):
-        listen = [listen]
-    endpoints: list[dict] = []
-    for ep in listen:
-        endpoints.extend(parse_endpoint(ep, default_port))
+    endpoints = parse_endpoints(listen, default_port)
+    if not endpoints:
+        raise ValueError("No endpoints to serve; check listen configuration")
 
     conf: dict[str, object] = {"app": app, "reload": reload, "workers": workers}
     proxy = os.getenv("FORWARDED_ALLOW_IPS", "127.0.0.1,::1")
@@ -45,7 +41,7 @@ def run(
         conf["forwarded_allow_ips"] = proxy
     conf.update(uvicorn_config)
 
-    with suppress(KeyboardInterrupt):
+    with suppress(KeyboardInterrupt, asyncio.CancelledError):
         if reload or workers:
             serve_multiprocess(endpoints, **conf)
         else:

fastapi-vue/fastapi_vue/staticfiles.py

@@ -276,6 +276,6 @@ def _devmode_respond(request: Request, name=""):
     return JSONResponse(
         status_code=409,
         content={
-            "detail": "Frontend assets served by Vite in debug mode. You are on backend, connect to frontend instead."
+            "detail": "[devmode] Not serving frontend files here. Should you connect to Vite instead?"
         },
     )

fastapi_vue_setup.py

@@ -8,11 +8,12 @@ Usage:
 Options:
     --module-name NAME      Python module name (auto-detected from pyproject.toml)
     --ports DEFAULT,VITE,DEV  Port configuration (default: 3100,3100,3200)
-    --dry-run               Show what would be done without making changes
+    --dry                   Show what would be done without making changes
 """
 
 import argparse
 import ast
+import importlib.metadata
 import os
 import re
 import shutil
@@ -20,31 +21,73 @@ import subprocess
 import sys
 from pathlib import Path
 from textwrap import indent
+from typing import Literal
 
 import tomlkit
 
-# Track Python files written/patched for ruff formatting
-_python_files_to_format: list[Path] = []
+version = importlib.metadata.version("fastapi-vue-setup")
 
 # Template directory
 TEMPLATE_DIR = Path(__file__).parent / "template"
 
 
-def ruff_sort_imports(files: list[Path], dry_run: bool = False) -> None:
-    """Run ruff to sort imports in the given Python files."""
-    if not files:
-        return
-    py_files = [str(f) for f in files if f.suffix == ".py" and f.exists()]
-    if not py_files:
-        return
-    if dry_run:
-        print(f"🔧 Would run ruff import sorting on {len(py_files)} files")
-        return
-    print("🔧 Ruff isort on modified files")
-    subprocess.run(
-        ["ruff", "check", "--select", "I", "--fix", *py_files],
-        stdout=subprocess.DEVNULL,
-    )
+def print_boxed(text: str) -> None:
+    """Print text in a Unicode rounded box."""
+    width = len(text) + 2
+    print(f"╭{'─' * width}╮")
+    print(f"│ {text} │")
+    print(f"╰{'─' * width}╯")
+
+
+def ruff_format_content(
+    content: str, target_path: Path, *, mode: Literal["isort", "full"] = "full"
+) -> str:
+    """Format Python content using ruff with project settings.
+
+    Writes to a temp file next to target, runs ruff check (import sorting)
+    and optionally ruff format on it, reads back the result, and cleans up.
+    Returns the formatted content, or original if ruff fails.
+
+    mode='isort' only sorts imports; mode='full' also formats.
+    """
+    temp_file = target_path.with_suffix(".new.py")
+    try:
+        temp_file.write_text(content, "UTF-8", newline="\n")
+        # Sort imports first
+        subprocess.run(
+            [
+                "uv",
+                "run",
+                "--with",
+                "ruff",
+                "ruff",
+                "check",
+                "--select",
+                "I",
+                "--fix",
+                str(temp_file),
+            ],
+            cwd=target_path.parent,
+            capture_output=True,
+        )
+        if mode == "isort":
+            return temp_file.read_text("UTF-8")
+        # Then format
+        result = subprocess.run(
+            ["uv", "run", "--with", "ruff", "ruff", "format", str(temp_file)],
+            cwd=target_path.parent,
+            capture_output=True,
+        )
+        if result.returncode == 0:
+            return temp_file.read_text("UTF-8")
+    except Exception:
+        pass
+    finally:
+        try:
+            temp_file.unlink(missing_ok=True)
+        except Exception:
+            pass
+    return content
 
 
 def uv_add_packages(
@@ -67,6 +110,9 @@ def uv_add_packages(
 # If vite == dev, dev is incremented by 100
 DEFAULT_PORTS = (3100, 3100, 3200)
 
+# Default health check path for devserver backend readiness check
+DEFAULT_HEALTH = "/api/health?from=devserver.py"
+
 # Marker comment indicating file can be auto-upgraded
 # Users should remove this line to prevent automatic updates
 UPGRADE_MARKER = "auto-upgrade@fastapi-vue-setup"
@@ -115,7 +161,7 @@ const backendStatus = ref<'checking' | 'connected' | 'error'>('checking')
 
 onMounted(async () => {
   try {
-    const res = await fetch('/api/health')
+    const res = await fetch('/api/health?from=frontend')
     backendStatus.value = res.ok ? 'connected' : 'error'
   } catch {
     backendStatus.value = 'error'
@@ -131,7 +177,7 @@ const backendStatus = ref('checking')
 
 onMounted(async () => {
   try {
-    const res = await fetch('/api/health')
+    const res = await fetch('/api/health?from=frontend')
     backendStatus.value = res.ok ? 'connected' : 'error'
   } catch {
     backendStatus.value = 'error'
@@ -150,17 +196,16 @@ STATUS_SPAN_TEMPLATE = """\
 """
 
 # Setup complete message template
-SETUP_COMPLETE_MESSAGE = """
-Next steps:
+SETUP_COMPLETE_MESSAGE = """\
+## Development server: (live reloads, debug)
+CD_CMDuv run scripts/devserver.py
 
-1. Build for production:
-   CD_CMDuv build
+## Production build:
+CD_CMDuv build && uv run SCRIPT_NAME
 
-2. Start development server:
-   CD_CMDuv run scripts/devserver.py
-
-3. Run production server:
-   CD_CMDuv run SCRIPT_NAME
+## Release Python package, run anywhere:
+CD_CMDuv build && uv publish
+uvx SCRIPT_NAME  # No Node required
 """
 
 
@@ -218,23 +263,20 @@ def find_import_insertion_line(source: str) -> int:
     return 2 if source.startswith("#!") else 1
 
 
-def extract_existing_ports(project_dir: Path) -> tuple[int, int, int] | None:
+def extract_existing_ports(
+    project_dir: Path, main: Path
+) -> tuple[int, int, int] | None:
     """Extract existing port configuration from project files.
 
     Returns (default, vite, dev) or None if not found.
     """
-    module_name = find_module_name(project_dir)
-    if not module_name:
-        return None
-
     default_port = None
     vite_port = None
     dev_port = None
 
-    # Try to extract DEFAULT_PORT from __main__.py
-    main_file = project_dir / module_name / "__main__.py"
-    if main_file.exists():
-        content = main_file.read_text("UTF-8")
+    # Try to extract DEFAULT_PORT from the CLI main module
+    if main.exists():
+        content = main.read_text("UTF-8")
         match = re.search(r"DEFAULT_PORT\s*=\s*(\d+)", content)
         if match:
             default_port = int(match.group(1))
@@ -261,6 +303,29 @@ def extract_existing_ports(project_dir: Path) -> tuple[int, int, int] | None:
     return None
 
 
+# Sentinel for "not found" in extract_existing_health
+_HEALTH_NOT_FOUND = object()
+
+
+def extract_existing_health(project_dir: Path) -> str | object:
+    """Extract existing health path configuration from devserver.py.
+
+    Returns:
+        - The path string (may be empty to disable)
+        - _HEALTH_NOT_FOUND sentinel if not found or file doesn't exist
+    """
+    devserver_file = project_dir / "scripts" / "devserver.py"
+    if not devserver_file.exists():
+        return _HEALTH_NOT_FOUND
+
+    content = devserver_file.read_text("UTF-8")
+    # Match HEALTH = "/path" or HEALTH = ""
+    match = re.search(r'^HEALTH\s*=\s*"([^"]*)"', content, re.MULTILINE)
+    if match:
+        return match.group(1)
+    return _HEALTH_NOT_FOUND
+
+
 def load_template(path: str) -> str:
     """Load a template file from the template directory."""
     return (TEMPLATE_DIR / path).read_text("UTF-8")
@@ -392,10 +457,43 @@ def _find_app_in_subpackage(subpkg_dir: Path) -> tuple[Path, str] | None:
     return None
 
 
-def _find_existing_cli_entrypoint(project_dir: Path, module_name: str) -> str | None:
+def _add_devmode_to_main(content: str) -> str:
+    """Add DEVMODE variable to an existing main module."""
+    lines = content.splitlines()
+
+    # Check if os is imported
+    has_os_import = any("import os" in line for line in lines)
+
+    # Find the first import line
+    insert_idx = 0
+    for i, line in enumerate(lines):
+        stripped = line.strip()
+        if stripped.startswith("import ") or stripped.startswith("from "):
+            insert_idx = i + 1
+        elif stripped and not stripped.startswith("#"):
+            break
+
+    # Insert imports and DEVMODE after existing imports
+    new_lines = []
+    if not has_os_import:
+        new_lines.append("import os")
+    new_lines.extend(
+        [
+            "",
+            "# Added by fastapi-vue-setup",
+            'DEVMODE = os.getenv("ENVPREFIX_DEV") == "1"',
+            "",
+        ]
+    )
+
+    lines[insert_idx:insert_idx] = new_lines
+    return "\n".join(lines)
+
+
+def _find_existing_cli_module_path(project_dir: Path, module_name: str) -> str | None:
     """Check if pyproject.toml already has a CLI entrypoint for this module.
 
-    Returns the entrypoint string if found, None otherwise.
+    Returns the module path (e.g., 'module.subpkg.__main__') if found, None otherwise.
     """
     pyproject = project_dir / "pyproject.toml"
     if not pyproject.exists():
@@ -413,7 +511,10 @@ def _find_existing_cli_entrypoint(project_dir: Path, module_name: str) -> str |
     # Look for any script that references our module
     for script_name, entry in scripts.items():
         if isinstance(entry, str) and entry.startswith(f"{module_name}."):
-            return f'{script_name} = "{entry}"'
+            # Extract module path from "module.subpkg.__main__:main"
+            if ":" in entry:
+                module_path, _ = entry.rsplit(":", 1)
+                return module_path
 
     return None
 
@@ -482,7 +583,7 @@ def render_template(template: str, **kwargs) -> str:
 
 
 def patch_app_file(
-    path: Path, module_name: str, app_var: str, dry_run: bool = False
+    path: Path, main_module_path: str, app_var: str, dry: bool = False
 ) -> bool:
     """Patch an existing app.py with frontend integration.
 
@@ -500,7 +601,7 @@ def patch_app_file(
 
     # Check what's already patched
     has_frontend = "from fastapi_vue import Frontend" in content
-    has_devmode = f"from {module_name}.__main__ import DEVMODE" in content
+    has_devmode = f"from {main_module_path} import DEVMODE" in content
     has_debug_arg = re.search(r"FastAPI\s*\([^)]*debug\s*=", content) is not None
     has_lifespan = "await frontend.load()" in content
 
@@ -515,7 +616,7 @@ def patch_app_file(
     if not has_frontend:
         imports.extend(["from pathlib import Path", "from fastapi_vue import Frontend"])
     if not has_devmode:
-        imports.append(f"from {module_name}.__main__ import DEVMODE")
+        imports.append(f"from {main_module_path} import DEVMODE")
     if imports:
         insert_line = find_import_insertion_line(content)
         lines = content.splitlines(keepends=True)
@@ -640,12 +741,13 @@ def patch_app_file(
         print(f"⚠️  Skipping {path} (no changes needed)")
         return False
 
-    if dry_run:
+    if dry:
         print(f"✅ Would patch {path}")
         return True
 
+    # Sort imports only (avoid full formatting of user code)
+    content = ruff_format_content(content, path, mode="isort")
     path.write_text(content, "UTF-8", newline="\n")
-    _python_files_to_format.append(path)
     print(f"✅ Patched {path}")
 
     if not lifespan_patched:
@@ -669,7 +771,7 @@ def patch_app_file(
 def patch_vite_config(
     path: Path,
     module_name: str,
-    dry_run: bool = False,
+    dry: bool = False,
 ) -> bool:
     """Patch an existing vite.config.js/ts by adding fastapi-vue plugin.
 
@@ -731,7 +833,7 @@ def patch_vite_config(
         print(f"ℹ️  Skipping {path} (no changes needed)")
         return False
 
-    if dry_run:
+    if dry:
         print(f"✅ Would patch {path}")
         return True
 
@@ -740,7 +842,7 @@ def patch_vite_config(
     return True
 
 
-def patch_frontend_health_check(frontend_dir: Path, dry_run: bool = False) -> bool:
+def patch_frontend_health_check(frontend_dir: Path, dry: bool = False) -> bool:
     """Patch Vue app to include FastAPI backend health check.
 
     Tries HelloWorld.vue first (full demo), then falls back to App.vue (minimal).
@@ -766,7 +868,7 @@ def patch_frontend_health_check(frontend_dir: Path, dry_run: bool = False) -> bo
             target_file = app_vue
 
     if target_file is None:
-        print("ℹ️  No Vue file found to patch, skipping frontend health check")
+        print("ℹ️  No default App.vue found to patch, not adding /api/health check")
         return False
 
     original_content = target_file.read_text("UTF-8")
@@ -811,7 +913,7 @@ def patch_frontend_health_check(frontend_dir: Path, dry_run: bool = False) -> bo
     else:
         # Minimal App.vue - only patch if it contains the default welcome message
         if "<h1>You did it!</h1>" not in content:
-            print(f"ℹ️  Skipping {target_file} (not a default Vue template)")
+            print(f"ℹ️  Skipping {target_file} (not a Vue demo app)")
             return False
         # Insert before the </p> tag
         template_end = content.find("</template>")
@@ -831,7 +933,7 @@ def patch_frontend_health_check(frontend_dir: Path, dry_run: bool = False) -> bo
         print(f"ℹ️  Skipping {target_file} (no changes needed)")
         return False
 
-    if dry_run:
+    if dry:
         print(f"✅ Would patch {target_file}")
         return True
 
@@ -847,9 +949,7 @@ _OLD_VITE_PLUGIN_SHA256 = (
 )
 
 
-def _upgrade_old_vite_plugin(
-    path: Path, module_name: str, dry_run: bool = False
-) -> None:
+def _upgrade_old_vite_plugin(path: Path, module_name: str, dry: bool = False) -> None:
     """Remove old vite-plugin-fastapi.js that lacks auto-upgrade marker.
 
     Old versions didn't have the upgrade marker, so write_file skips them as
@@ -869,7 +969,7 @@ def _upgrade_old_vite_plugin(
     digest = hashlib.sha256(normalized.encode()).hexdigest()
     if digest != _OLD_VITE_PLUGIN_SHA256:
         return  # Modified by user, don't touch
-    if dry_run:
+    if dry:
         print(f"🔄 Would upgrade old {path}")
         return
     path.unlink()
@@ -884,7 +984,7 @@ def write_file(
     path: Path,
     content: str,
     overwrite: bool = True,
-    dry_run: bool = False,
+    dry: bool = False,
     executable: bool = False,
     fallback_path: Path | None = None,
     force: bool = False,
@@ -895,13 +995,20 @@ def write_file(
     the content will be written to fallback_path instead of being skipped.
 
     If force=True, always overwrite without checking for upgrade marker.
+
+    Python files (.py) are automatically formatted using ruff with the project's
+    settings before writing.
     """
+    # Format Python content using project settings before any comparison/writing
+    if path.suffix == ".py":
+        content = ruff_format_content(content, path)
+
     exists = path.exists()
     if exists and not overwrite:
         print(f"⚠️  Skipping {path} (exists)")
         return False
 
-    # Check if content is the same
+    # Check if content is the same (new content already formatted)
     if exists:
         existing_content = path.read_text("UTF-8")
         if existing_content == content:
@@ -913,12 +1020,12 @@ def write_file(
             if fallback_path is not None:
                 # Write to fallback path instead
                 return _write_fallback_file(
-                    path, fallback_path, content, dry_run, executable
+                    path, fallback_path, content, dry, executable
                 )
             print(f"ℹ️  Skipping {path} (customized by user)")
             return False
 
-    if dry_run:
+    if dry:
         action = "overwrite" if exists else "create"
         print(f"✅ Would {action} {path}")
         return True
@@ -927,8 +1034,6 @@ def write_file(
     path.write_text(content, "UTF-8", newline="\n")
     if executable and sys.platform != "win32":
         path.chmod(path.stat().st_mode | 0o111)
-    if path.suffix == ".py":
-        _python_files_to_format.append(path)
     action = "Updated" if exists else "Created"
     print(f"✅ {action} {path}")
     return True
@@ -938,17 +1043,22 @@ def _write_fallback_file(
     original_path: Path,
     fallback_path: Path,
     content: str,
-    dry_run: bool,
+    dry: bool,
     executable: bool,
 ) -> bool:
-    """Write content to a fallback .new.py file when original can't be overwritten."""
-    # Check if fallback already has same content
+    """Write content to a fallback .new.py file when original can't be overwritten.
+
+    Note: content should already be formatted before calling this function.
+    """
+    # Check if fallback already has same content (content already formatted)
     if fallback_path.exists():
-        if fallback_path.read_text("UTF-8") == content:
+        existing_content = fallback_path.read_text("UTF-8")
+        if existing_content == content:
             print(f"✔️  {fallback_path} (already up to date)")
+            _new_files_written.append((fallback_path, original_path))
             return False
 
-    if dry_run:
+    if dry:
         print(f"✅ Would create {fallback_path} (original customized by user)")
         _new_files_written.append((fallback_path, original_path))
         return True
@@ -957,8 +1067,6 @@ def _write_fallback_file(
     fallback_path.write_text(content, "UTF-8", newline="\n")
     if executable and sys.platform != "win32":
         fallback_path.chmod(fallback_path.stat().st_mode | 0o111)
-    if fallback_path.suffix == ".py":
-        _python_files_to_format.append(fallback_path)
     print(f"✅ Created {fallback_path} (original customized by user)")
     _new_files_written.append((fallback_path, original_path))
     return True
@@ -1085,13 +1193,13 @@ def find_js_runtime() -> tuple[str, str] | None:
     return None
 
 
-def ensure_python_project(project_dir: Path, dry_run: bool = False) -> bool:
+def ensure_python_project(project_dir: Path, dry: bool = False) -> bool:
     """Ensure pyproject.toml exists, run uv init if needed."""
     pyproject = project_dir / "pyproject.toml"
     if pyproject.exists():
         return True
 
-    if dry_run:
+    if dry:
         print(f"📦 Would run: uv init {project_dir}")
         return True
 
@@ -1111,7 +1219,7 @@ def ensure_python_project(project_dir: Path, dry_run: bool = False) -> bool:
     return True
 
 
-def ensure_frontend(project_dir: Path, dry_run: bool = False) -> bool:
+def ensure_frontend(project_dir: Path, dry: bool = False) -> bool:
     """Ensure frontend directory exists with a Vue project, run create-vue if needed."""
     frontend_dir = project_dir / "frontend"
     package_json = frontend_dir / "package.json"
@@ -1135,7 +1243,7 @@ def ensure_frontend(project_dir: Path, dry_run: bool = False) -> bool:
     }
     create_cmd = create_vue_commands[js_name]
 
-    if dry_run:
+    if dry:
         print(f"🎨 Would run: {' '.join(create_cmd)}")
         return True
 
@@ -1175,11 +1283,15 @@ def cmd_setup(args: argparse.Namespace) -> int:
         project_dir = Path.cwd() / project_path
 
     project_dir = project_dir.resolve()
-    dry_run = args.dry_run
+    dry = args.dry
+
+    print_boxed(f"fastapi-vue-setup {version}")
+    if dry:
+        print("🏃 DRY RUN MODE - no changes will be made\n")
 
     # Create project directory if it doesn't exist
     if not project_dir.exists():
-        if dry_run:
+        if dry:
             print(f"✅ Would create directory: {project_dir}")
         else:
             project_dir.mkdir(parents=True)
@@ -1187,15 +1299,12 @@ def cmd_setup(args: argparse.Namespace) -> int:
 
     print(f"🔧 Setting up project: {project_dir}")
 
-    if dry_run:
-        print("\n🏃 DRY RUN MODE - no changes will be made\n")
-
     # Step 1: Ensure frontend exists (do this first so cancellation doesn't leave partial setup)
-    if not ensure_frontend(project_dir, dry_run):
+    if not ensure_frontend(project_dir, dry):
         return 1
 
     # Step 2: Ensure Python project exists
-    if not ensure_python_project(project_dir, dry_run):
+    if not ensure_python_project(project_dir, dry):
         return 1
 
     # Detect module name
@@ -1207,13 +1316,28 @@ def cmd_setup(args: argparse.Namespace) -> int:
     else:
         print(f"📦 Module: {module_name}")
 
+    module_dir = project_dir / module_name
+    scripts_dir = project_dir / "scripts"
+    fastapi_vue_scripts = scripts_dir / "fastapi-vue"
+
+    # Check if project already has a CLI entrypoint in pyproject.toml
+    existing_cli_module = _find_existing_cli_module_path(project_dir, module_name)
+
+    # Determine main module path for DEVMODE import
+    main_module_path = existing_cli_module or f"{module_name}.__main__"
+    if existing_cli_module:
+        print(f"ℹ️  Using existing CLI: {existing_cli_module}")
+
+    # Resolve the CLI main module to a file path
+    main = project_dir / Path(*main_module_path.split(".")).with_suffix(".py")
+
     # Determine port configuration
     # Priority: --ports argument > existing project values > defaults
     if args.ports:
         default_port, vite_port, dev_port = parse_ports(args.ports)
         ports_note = "(--ports)"
     else:
-        existing_ports = extract_existing_ports(project_dir)
+        existing_ports = extract_existing_ports(project_dir, main)
         if existing_ports:
             default_port, vite_port, dev_port = existing_ports
             ports_note = "(kept for upgrade)"
@@ -1225,9 +1349,35 @@ def cmd_setup(args: argparse.Namespace) -> int:
         f"📡 Ports: default={default_port}, vite={vite_port}, dev={dev_port} {ports_note}"
     )
 
+    # Determine health path configuration
+    # Priority: --health argument > existing project value > default
+    if args.health is not None:
+        health = args.health
+        health_note = "(--health)" if health else "(disabled via --health)"
+    else:
+        existing_health = extract_existing_health(project_dir)
+        if existing_health is not _HEALTH_NOT_FOUND:
+            # Explicitly configured (path string, possibly empty to disable)
+            health = existing_health
+            health_note = "(kept for upgrade)"
+        else:
+            # Not found - use default
+            health = DEFAULT_HEALTH
+            health_note = "(--health to override)"
+
+    if health:
+        print(f"🏥 Health check: {health} {health_note}")
+    else:
+        print(f"🏥 Health check: disabled {health_note}")
+
     # Title for templates
     project_title = module_name.replace("_", " ").title()
 
+    # Find existing FastAPI app
+    app_info = (
+        find_fastapi_app(module_dir, project_dir) if module_dir.exists() else None
+    )
+
     # Template variables
     tpl_vars = {
         "MODULE_NAME": module_name,
@@ -1235,33 +1385,28 @@ def cmd_setup(args: argparse.Namespace) -> int:
         "TEMPLATE_DEFAULT_PORT": str(default_port),
         "TEMPLATE_VITE_PORT": str(vite_port),
         "TEMPLATE_DEV_PORT": str(dev_port),
+        "TEMPLATE_HEALTH": f'"{health}"',
         "ENVPREFIX": module_name.upper(),
         "PROJECT_CLI": module_name,
+        "MAIN_MODULE": main_module_path,
     }
 
-    module_dir = project_dir / module_name
-    scripts_dir = project_dir / "scripts"
-    fastapi_vue_scripts = scripts_dir / "fastapi-vue"
-
-    # Find existing FastAPI app
-    app_info = (
-        find_fastapi_app(module_dir, project_dir) if module_dir.exists() else None
-    )
-
     if app_info:
         app_file, app_var = app_info
         print(f"📍 Found FastAPI app: {app_var} in {app_file.name}")
         tpl_vars["APP_VAR"] = app_var
-        tpl_vars["APP_MODULE"] = app_file.stem
+        # Dotted module path relative to project dir (e.g. "paskia.fastapi.mainapp")
+        app_module = ".".join(app_file.relative_to(project_dir).with_suffix("").parts)
+        tpl_vars["APP_MODULE"] = app_module
     else:
         print("📍 No existing FastAPI app found, will create new one")
         app_file = None
         app_var = "app"
         tpl_vars["APP_VAR"] = app_var
-        tpl_vars["APP_MODULE"] = "app"
+        tpl_vars["APP_MODULE"] = f"{module_name}.app"
 
     # Create directories
-    if not dry_run:
+    if not dry:
         if not module_dir.exists():
             module_dir.mkdir(parents=True)
         fastapi_vue_scripts.mkdir(parents=True, exist_ok=True)
@@ -1273,7 +1418,7 @@ def cmd_setup(args: argparse.Namespace) -> int:
     # Remove obsolete util.py if present
     obsolete_util = fastapi_vue_scripts / "util.py"
     if obsolete_util.exists():
-        if dry_run:
+        if dry:
             print(f"🗑️ Would remove obsolete {obsolete_util}")
         else:
             obsolete_util.unlink()
@@ -1290,7 +1435,7 @@ def cmd_setup(args: argparse.Namespace) -> int:
                 dest_path,
                 content,
                 overwrite=True,
-                dry_run=dry_run,
+                dry=dry,
                 force=True,  # Internal files, always overwrite
             )
 
@@ -1303,7 +1448,7 @@ def cmd_setup(args: argparse.Namespace) -> int:
         devserver_path,
         content,
         overwrite=True,
-        dry_run=dry_run,
+        dry=dry,
         executable=True,
         fallback_path=devserver_fallback,
     )
@@ -1311,7 +1456,7 @@ def cmd_setup(args: argparse.Namespace) -> int:
     # === Handle app module ===
     if app_file:
         # Existing app: patch with import, route, and try to patch lifespan
-        patch_app_file(app_file, module_name, app_var, dry_run=dry_run)
+        patch_app_file(app_file, main_module_path, app_var, dry=dry)
     else:
         # No app: create full app.py
         # Create __init__.py if missing
@@ -1319,43 +1464,66 @@ def cmd_setup(args: argparse.Namespace) -> int:
         if not init_file.exists():
             template = load_template("backend/__init__.py")
             content = render_template(template, **tpl_vars)
-            write_file(init_file, content, overwrite=False, dry_run=dry_run)
+            write_file(init_file, content, overwrite=False, dry=dry)
 
         # Create app.py
         app_file_path = module_dir / "app.py"
         template = load_template("backend/app.py")
         content = render_template(template, **tpl_vars)
-        write_file(app_file_path, content, overwrite=False, dry_run=dry_run)
+        write_file(app_file_path, content, overwrite=False, dry=dry)
 
     # === Handle __main__.py ===
+    if existing_cli_module:
+        # Existing CLI entrypoint - write .new.py beside the existing main module
+        main_fallback = main.with_suffix(".new.py")
+    else:
+        main_fallback = module_dir / "__main__.new.py"
+
     main_file = module_dir / "__main__.py"
-    main_fallback = module_dir / "__main__.new.py"
     template = load_template("backend/__main__.py")
     main_content = render_template(template, **tpl_vars)
 
-    # Check if project already has a CLI entrypoint in pyproject.toml
-    existing_cli = _find_existing_cli_entrypoint(project_dir, module_name)
-
     if main_file.exists():
         # File exists: update if it has the auto-upgrade marker, otherwise use fallback
         write_file(
             main_file,
             main_content,
             overwrite=True,
-            dry_run=dry_run,
+            dry=dry,
             fallback_path=main_fallback,
         )
-    elif not existing_cli:
+    elif not existing_cli_module:
         # No file and no existing entrypoint: create new __main__.py
         write_file(
             main_file,
             main_content,
             overwrite=False,
-            dry_run=dry_run,
+            dry=dry,
         )
     else:
-        # No file but has existing entrypoint - don't create (user has custom CLI setup)
-        print(f"ℹ️  Skipping __main__.py (package already has CLI: {existing_cli})")
+        # Existing CLI entrypoint: write our template as .new.py beside the existing module
+        # and also patch the existing module with DEVMODE if needed
+        _write_fallback_file(
+            main,
+            main_fallback,
+            main_content,
+            dry=dry,
+            executable=False,
+        )
+        if main.exists():
+            content = main.read_text("UTF-8")
+            if "DEVMODE" not in content:
+                new_content = _add_devmode_to_main(content)
+                new_file = main.with_suffix(".new.py")
+                _write_fallback_file(
+                    main,
+                    new_file,
+                    new_content,
+                    dry=dry,
+                    executable=False,
+                )
+        else:
+            print(f"⚠️  Existing CLI main module {main} not found")
 
     # === Update vite.config.js/ts ===
     frontend_dir = project_dir / "frontend"
@@ -1363,25 +1531,25 @@ def cmd_setup(args: argparse.Namespace) -> int:
         # Install the vite plugin file (always update)
         plugin_file = frontend_dir / "vite-plugin-fastapi.js"
         # Upgrade old plugin versions that lack the auto-upgrade marker
-        _upgrade_old_vite_plugin(plugin_file, module_name, dry_run)
+        _upgrade_old_vite_plugin(plugin_file, module_name, dry)
         template = load_template("frontend/vite-plugin-fastapi.js")
         content = render_template(template, **tpl_vars)
-        write_file(plugin_file, content, overwrite=True, dry_run=dry_run)
+        write_file(plugin_file, content, overwrite=True, dry=dry)
 
         # Find existing vite config (prefer .ts, fall back to .js)
         vite_config_ts = frontend_dir / "vite.config.ts"
         vite_config_js = frontend_dir / "vite.config.js"
 
         if vite_config_ts.exists():
-            patch_vite_config(vite_config_ts, module_name, dry_run)
+            patch_vite_config(vite_config_ts, module_name, dry)
         elif vite_config_js.exists():
-            patch_vite_config(vite_config_js, module_name, dry_run)
+            patch_vite_config(vite_config_js, module_name, dry)
         else:
             print("⚠️  No vite.config.ts or vite.config.js found in frontend/")
             print("   Run create-vue first to generate a Vite config to patch.")
 
         # Patch Vue app with backend health check
-        patch_frontend_health_check(frontend_dir, dry_run)
+        patch_frontend_health_check(frontend_dir, dry)
 
     # === Update pyproject.toml ===
     pyproject_path = project_dir / "pyproject.toml"
@@ -1402,7 +1570,7 @@ def cmd_setup(args: argparse.Namespace) -> int:
 
         if new_content == old_content:
             print(f"✔️  {pyproject_path} (already up to date)")
-        elif dry_run:
+        elif dry:
             print(f"✅ Would update {pyproject_path}")
         else:
             pyproject_path.write_text(new_content, "UTF-8", newline="\n")
@@ -1415,7 +1583,7 @@ def cmd_setup(args: argparse.Namespace) -> int:
         gitignore_content = gitignore_path.read_bytes()
         if b"frontend-build" in gitignore_content:
             print("✔️  .gitignore (frontend-build already ignored)")
-        elif dry_run:
+        elif dry:
             print(f"✅ Would add {gitignore_entry} to .gitignore")
         else:
             nl = b"\r\n" if b"\r\n" in gitignore_content else b"\n"
@@ -1424,15 +1592,14 @@ def cmd_setup(args: argparse.Namespace) -> int:
                 gitignore_content + suffix + gitignore_entry.encode() + nl
             )
             print(f"✅ Added {gitignore_entry} to .gitignore")
-    elif dry_run:
+    elif dry:
         print(f"✅ Would create .gitignore with {gitignore_entry}")
     else:
         gitignore_path.write_text(f"{gitignore_entry}\n", "UTF-8", newline="\n")
         print("✅ Created .gitignore")
 
     # === Add dependencies using uv ===
-    ruff_sort_imports(_python_files_to_format, dry_run=dry_run)
-    if dry_run:
+    if dry:
         print("📦 Would add: fastapi[standard], fastapi-vue, httpx (dev only)")
     else:
         print("📦 Dependencies")
@@ -1440,12 +1607,10 @@ def cmd_setup(args: argparse.Namespace) -> int:
         uv_add_packages(["httpx"], cwd=project_dir, group="dev")
 
     print()
-    print("=" * 60)
-    print("✅ Setup complete!")
-    print("=" * 60)
+    print_boxed("Setup complete!")
 
     # Show cd command only if project is not in current directory
-    cd_cmd = "" if project_dir == Path.cwd() else f"cd {project_dir}\n   "
+    cd_cmd = "" if project_dir == Path.cwd() else f"cd {project_dir}; "
     script_name = module_name.replace("_", "-")
 
     message = SETUP_COMPLETE_MESSAGE.replace("CD_CMD", cd_cmd).replace(
@@ -1456,12 +1621,16 @@ def cmd_setup(args: argparse.Namespace) -> int:
     # Show merge note if any .new.py files were written
     if _new_files_written:
         print()
-        print(
-            "⚠️  Note: Some files could not be auto-upgraded because you customized them."
-        )
+        print("⚠️  Some files could not be auto-upgraded because you customized them.")
         print("   Please manually merge the following files:")
         for new_file, original_file in _new_files_written:
-            print(f"     • {new_file.name} → {original_file.name}")
+            try:
+                new_rel = new_file.relative_to(project_dir)
+                orig_rel = original_file.relative_to(project_dir)
+            except ValueError:
+                new_rel = new_file.name
+                orig_rel = original_file.name
+            print(f"     • {new_rel} → {orig_rel}")
         print()
         # Clear the list for potential subsequent runs
         _new_files_written.clear()
@@ -1469,11 +1638,6 @@ def cmd_setup(args: argparse.Namespace) -> int:
     return 0
 
 
-# =============================================================================
-# Main entry point
-# =============================================================================
-
-
 def is_uninitialized_folder(path: Path) -> bool:
     """Check if a folder appears to be completely uninitialized."""
     return (
@@ -1496,14 +1660,14 @@ def is_already_patched(path: Path) -> bool:
 
 def main() -> int:
     parser = argparse.ArgumentParser(
-        description="Set up FastAPI+Vue projects with integrated build/dev systems",
+        description=f"fastapi-vue-setup {version} - FastAPI + Vue project setup tool",
         formatter_class=argparse.RawDescriptionHelpFormatter,
         epilog="""
 Examples:
   fastapi-vue-setup my-new-project     Create a new project from scratch
   fastapi-vue-setup .                  Set up integration in current directory
-  fastapi-vue-setup . --dry-run        Preview what would be done
-  fastapi-vue-setup . --ports 8000,5173,8080  Custom ports (default,vite,dev)
+  fastapi-vue-setup . --dry            Preview what would be done
+  fastapi-vue-setup . --ports=8000,5173,8080  Change default ports (backend, vite dev, backend dev)
 """,
     )
     parser.add_argument(
@@ -1512,14 +1676,20 @@ Examples:
         default=None,
         help="Project directory (use . for current directory)",
     )
+    parser.add_argument("--version", action="version", version=version)
     parser.add_argument("--module-name", help="Python module name (auto-detected)")
     parser.add_argument(
         "--ports",
-        metavar="DEFAULT,VITE,DEV",
+        metavar="BACKEND,VITE,DEV",
         help="Port configuration as comma-separated values (default: 3100,3100,3200)",
     )
     parser.add_argument(
-        "--dry-run", action="store_true", help="Show what would be done"
+        "--health",
+        metavar="PATH",
+        help="Health check path for devserver (default: /api/health?from=devserver.py, '' to disable)",
+    )
+    parser.add_argument(
+        "--dry", "--dry-run", action="store_true", help="Show what would be done"
     )
 
     args = parser.parse_args()

template/backend/__main__.py

@@ -5,7 +5,7 @@ import os
 from fastapi_vue import server
 
 DEFAULT_PORT = TEMPLATE_DEFAULT_PORT
-DEVMODE = bool(os.getenv("ENVPREFIX_FRONTEND_URL"))
+DEVMODE = os.getenv("ENVPREFIX_DEV") == "1"
 
 
 def main():
@@ -17,12 +17,12 @@ def main():
         help=(f"Endpoint (default: localhost:{DEFAULT_PORT})."),
     )
     args = parser.parse_args()
-    dev = {"reload": True, "reload_dirs": ["MODULE_NAME"]}
+    dev = {"reload": True, "reload_dirs": ["paskia"]} if DEVMODE else {}
     server.run(
-        "MODULE_NAME.APP_MODULE:APP_VAR",
+        "APP_MODULE:APP_VAR",
         listen=args.listen,
         default_port=DEFAULT_PORT,
-        **(dev if DEVMODE else {}),
+        **dev,
     )
 
 

template/backend/app.py

@@ -3,7 +3,7 @@ from pathlib import Path
 
 from fastapi import FastAPI
 from fastapi_vue import Frontend
-from MODULE_NAME.__main__ import DEVMODE
+from MAIN_MODULE import DEVMODE
 
 # Vue Frontend static files
 frontend = Frontend(Path(__file__).with_name("frontend-build"))

template/frontend/vite-plugin-fastapi.js

@@ -11,7 +11,7 @@
  */
 
 export default function fastapiVue({ paths = ["/api"] } = {}) {
-  const backendUrl = process.env.ENVPREFIX_BACKEND_URL || "http://localhost:TEMPLATE_DEFAULT_PORT"
+  const backendUrl = process.env.ENVPREFIX_BACKEND_URL || "http://localhost:TEMPLATE_DEV_PORT"
 
   // Build proxy configuration for each path
   const proxy = {}

template/scripts/devserver.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env -S uv run
 # auto-upgrade@fastapi-vue-setup - remove this if you modify this file
-"""Run Vite development server for frontend and FastAPI backend with auto-reload."""
+"""Run Vite development server for Vue app and FastAPI backend with auto-reload."""
 
 import argparse
 import asyncio
@@ -22,10 +22,11 @@ from devutil import (  # type: ignore
 
 DEFAULT_VITE_PORT = TEMPLATE_VITE_PORT
 DEFAULT_DEV_PORT = TEMPLATE_DEV_PORT
+HEALTH = TEMPLATE_HEALTH
 
 
 async def run_devserver(
-    frontend: str, backend: str, extra_args: list[str] | None = None
+    listen: str, backend: str, extra_args: list[str] | None = None
 ) -> None:
     reporoot = Path(__file__).parent.parent
     front = reporoot / "frontend"
@@ -33,18 +34,19 @@ async def run_devserver(
         logger.warning("Frontend source not found at %s", front)
         raise SystemExit(1)
 
-    viteurl, npm_install, vite = setup_vite(frontend, DEFAULT_VITE_PORT)
+    viteurl, npm_install, vite = setup_vite(listen, DEFAULT_VITE_PORT)
     backurl, MODULE_NAME = setup_cli("PROJECT_CLI", backend, DEFAULT_DEV_PORT)
 
-    # Tell the everyone where the frontend and backend are (vite proxy, etc)
-    os.environ["ENVPREFIX_FRONTEND_URL"] = viteurl
+    # Tell the everyone by environment (vite proxy and backend devmode use these)
+    os.environ["ENVPREFIX_VITE_URL"] = viteurl
     os.environ["ENVPREFIX_BACKEND_URL"] = backurl
+    os.environ["ENVPREFIX_DEV"] = "1"
 
     async with ProcessGroup() as pg:
         npm_i = await pg.spawn(*npm_install, cwd=front)
         await check_ports_free(viteurl, backurl)
         await pg.spawn(*MODULE_NAME, *(extra_args or []))
-        await pg.wait(npm_i, ready(backurl, path="/api/health?from=devserver.py"))
+        await pg.wait(npm_i, ready(backurl, path=HEALTH))
         await pg.spawn(*vite, cwd=front)
 
 
@@ -55,23 +57,23 @@ def main():
         epilog=HELP_EPILOG,
     )
     parser.add_argument(
-        "frontend",
-        nargs="?",
-        metavar="host:port",
-        help=f"Vite frontend endpoint (default: localhost:{DEFAULT_VITE_PORT})",
+        "-l",
+        "--listen",
+        metavar="addr",
+        help=f"Vite (default: localhost:{DEFAULT_VITE_PORT})",
     )
     parser.add_argument(
         "--backend",
-        metavar="host:port",
-        help=f"FastAPI backend endpoint (default: localhost:{DEFAULT_DEV_PORT})",
+        metavar="addr",
+        help=f"FastAPI (default: localhost:{DEFAULT_DEV_PORT})",
     )
     args, extra_args = parser.parse_known_args()
     with suppress(KeyboardInterrupt):
-        asyncio.run(run_devserver(args.frontend, args.backend, extra_args))
+        asyncio.run(run_devserver(args.listen, args.backend, extra_args))
 
 
 HELP_EPILOG = """
-  scripts/devserver.py [args to PROJECT_CLI]
+  Other options are forwarded to PROJECT_CLI [args]
 
   JS_RUNTIME environment variable can be used to select the JS runtime:
   npm, deno, bun, or full path to the runtime executable (node maps to npm).

template/scripts/fastapi-vue/devutil.py

@@ -111,18 +111,19 @@ async def check_ports_free(*urls: str) -> None:
         await asyncio.gather(*[check(client, url) for url in urls])
 
 
-async def ready(url: str, path: str = "") -> None:
+async def ready(url: str, path: str = "", max_attempts=50) -> None:
     """Wait for the server to be ready by polling an endpoint.
 
+    Use empty path to disable the check and make this return immediately.
     Raises SystemExit(1) if server doesn't start in time.
     """
-    max_attempts = 50
-    full_url = f"{url}{path}"
+    if not path:
+        return
 
     async with httpx.AsyncClient() as client:
         for attempt in range(max_attempts):
             try:
-                await client.get(full_url, timeout=1.0)
+                await client.get(f"{url}{path}", timeout=1.0)
                 logger.info("✓ Backend ready!")
                 return
             except httpx.RequestError:
@@ -207,10 +208,5 @@ def setup_cli(
     host = endpoints[0]["host"]
     port = endpoints[0]["port"]
 
-    cmd = [
-        sys.executable,
-        "-m",
-        cli,
-        f"--listen={host}:{port}",
-    ]
+    cmd = [cli, f"--listen={host}:{port}"]
     return f"http://{host}:{port}", cmd