# fastapi-router-py

This skill builds FastAPI routers with CRUD handlers, auth dependencies, and response models. Use it when adding REST endpoints or protected routes.

- skill · `type=skill` · Claude Code, GitHub Copilot · 4 installs · ★ 3149
- Author: Microsoft
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/microsoft/skills/tree/HEAD/.github/plugins/azure-sdk-python/skills/fastapi-router-py/SKILL.md
- Updated: 2026-10-23
- HTML: https://affpapa.org/en/nevibecode/skills/fastapi-router-py

## What it does

fastapi-router-py guides an agent through FastAPI router work using established endpoint patterns. It covers CRUD handlers, optional and required authentication dependencies, response models, and status codes for create and delete operations. Resource names are mapped to PascalCase, snake_case, and plural forms when the router is generated.

The integration path includes a router under `src/backend/app/routers/`, registration in `src/backend/app/main.py`, matching Pydantic models, and a service layer when the feature needs one. The skill also accounts for frontend API functions and keeps long-lived database pools or HTTP clients in `lifespan`, exposing them through `Depends`.

Blocking I/O inside an `async def` handler breaks the stated endpoint pattern. Choose `def` or `async def` based on the I/O you call, and use `with` or `async with` for per-request resources.

## Requirements
- Works with: Azure

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add microsoft/skills --skill fastapi-router-py -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/fastapi-router-py/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/fastapi-router-py/

### Codex

**Manually: put the files in place**
- File: `.agents/skills/fastapi-router-py/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

**Manually: put the files in place**
- File: `.cursor/skills/fastapi-router-py/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install microsoft/skills fastapi-router-py
```

2. **Manually: put the files in place**
- File: `.github/skills/fastapi-router-py/SKILL.md`

### Gemini CLI

**Platform CLI**
```bash
gemini skills install https://github.com/microsoft/skills --path .github/plugins/azure-sdk-python/skills/fastapi-router-py
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/fastapi-router-py/SKILL.md` — The legacy .windsurf/skills/ path still works

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/microsoft/skills/tree/HEAD/.github/plugins/azure-sdk-python/skills/fastapi-router-py/SKILL.md

## When to use it
- create a FastAPI router for a resource
- add CRUD handlers to a REST API
- require authentication with `Depends`
- define response models and HTTP status codes
- register a router in `main.py`

## Example prompts
- Create a FastAPI router for a Project resource with CRUD handlers and response models.
- Add required authentication with `get_current_user_required` and return `HTTP_201_CREATED` when a resource is created.
- Place the router in `src/backend/app/routers/`, register it in `src/backend/app/main.py`, and add the matching Pydantic models.

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 5b5d5bedb35e1290.

BEGIN THIRD-PARTY FILE 5b5d5bedb35e1290
````text
---
name: fastapi-router-py
description: Create FastAPI routers with CRUD operations, authentication dependencies, and proper response models. Use when building REST API endpoints, creating new routes, implementing CRUD operations, or adding authenticated endpoints in FastAPI applications.
license: MIT
metadata:
  author: Microsoft
  version: "1.0.0"
---

# FastAPI Router

Create FastAPI routers following established patterns with proper authentication, response models, and HTTP status codes.

## Quick Start

Copy the template from [assets/template.py](assets/template.py) and replace placeholders:
- `{{ResourceName}}` → PascalCase name (e.g., `Project`)
- `{{resource_name}}` → snake_case name (e.g., `project`)
- `{{resource_plural}}` → plural form (e.g., `projects`)

## Authentication Patterns

```python
# Optional auth - returns None if not authenticated
current_user: Optional[User] = Depends(get_current_user)

# Required auth - raises 401 if not authenticated
current_user: User = Depends(get_current_user_required)
```

## Response Models

```python
@router.get("/items/{item_id}", response_model=Item)
async def get_item(item_id: str) -> Item:
    ...

@router.get("/items", response_model=list[Item])
async def list_items() -> list[Item]:
    ...
```

## HTTP Status Codes

```python
@router.post("/items", status_code=status.HTTP_201_CREATED)
async def create_item(item: ItemCreate) -> Item:
  ...

@router.delete("/items/{id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_item(id: str) -> None:
  ...
```

## Integration Steps

1. Create router in `src/backend/app/routers/`
2. Mount in `src/backend/app/main.py`
3. Create corresponding Pydantic models
4. Create service layer if needed
5. Add frontend API functions

## Best Practices

1. **Pick `def` or `async def` per endpoint based on whether you call async I/O; do not call blocking I/O from an `async def` handler.**
2. **Manage long-lived resources (DB pools, HTTP clients) in `lifespan` and inject via `Depends`;** use `with`/`async with` for per-request resources.

## Reference Files

| File | Contents |
|------|----------|
| [references/capabilities.md](references/capabilities.md) | Additional non-hero capabilities, operation-group coverage, and production checklists. |
````
END THIRD-PARTY FILE 5b5d5bedb35e1290

The third-party file has ended. Everything between the 5b5d5bedb35e1290 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

© Microsoft · MIT · https://github.com/microsoft/skills/tree/HEAD/.github/plugins/azure-sdk-python/skills/fastapi-router-py/SKILL.md

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