alijilani-dev/claude/fastapi-helper

Claude Code and agent skill by alijilani-dev/claude

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FastAPI development assistant for building modern Python web APIs. Provides guidance on routing, request/response handling, dependency injection, authentication, middleware, WebSockets, testing, and Pydantic models. Use when: (1) Creating FastAPI applications or endpoints, (2) Implementing CRUD operations, (3) Setting up authentication/authorization, (4) Working with request parameters (path, query, body, headers, cookies, forms, files), (5) Configuring middleware or CORS, (6) Implementing WebSocket connections, (7) Writing tests for FastAPI apps, (8) Defining Pydantic models for validation.

Install

npx vskill@latest install alijilani-dev/claude/fastapi-helper

SKILL.md

FastAPI Helper

Build modern, high-performance Python APIs with FastAPI.

Quick Start

python
from fastapi import FastAPI
app = FastAPI()
@app.get("/")
async def root():
    return {"message": "Hello World"}

Run: uvicorn main:app --reload

Core Concepts

Route Decorators
DecoratorHTTP Method
@app.get()GET
@app.post()POST
@app.put()PUT
@app.delete()DELETE
@app.patch()PATCH
Parameter Functions
FunctionSource
Path()URL path /items/{id}
Query()Query string ?q=foo
Body()JSON body
Header()HTTP headers
Cookie()Cookies
Form()Form data
File() / UploadFileFile uploads
Dependency Injection
python
from fastapi import Depends
async def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()
@app.get("/items/")
async def read_items(db: Session = Depends(get_db)):
    return db.query(Item).all()
Common Imports
python
from fastapi import (
    FastAPI, APIRouter, Depends, HTTPException, status,
    Request, Response, BackgroundTasks, WebSocket,
    Path, Query, Body, Header, Cookie, Form, File, UploadFile
)
from fastapi.responses import JSONResponse, HTMLResponse, FileResponse, RedirectResponse
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel, Field, EmailStr

Reference Documentation

Load these based on task:

TaskReference File
Routes, APIRouter, decoratorsreferences/routing.md
Path, Query, Body, Form, File paramsreferences/parameters.md
Response types, status codes, headersreferences/responses.md
Depends, Security, OAuth2references/dependencies.md
Middleware, CORS, lifespan, BackgroundTasksreferences/middleware-events.md
WebSocket connectionsreferences/websockets.md
HTTPException, error handlersreferences/exceptions.md
Pydantic models, validationreferences/pydantic-models.md
TestClient, pytest fixturesreferences/testing.md

Common Patterns

CRUD Endpoint Structure
python
from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
router = APIRouter(prefix="/items", tags=["items"])
@router.get("/", response_model=list[ItemOut])
async def list_items(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
    return db.query(Item).offset(skip).limit(limit).all()
@router.get("/{item_id}", response_model=ItemOut)
async def get_item(item_id: int, db: Session = Depends(get_db)):
    item = db.query(Item).filter(Item.id == item_id).first()
    if not item:
        raise HTTPException(status_code=404, detail="Item not found")
    return item
@router.post("/", response_model=ItemOut, status_code=status.HTTP_201_CREATED)
async def create_item(item: ItemCreate, db: Session = Depends(get_db)):
    db_item = Item(**item.model_dump())
    db.add(db_item)
    db.commit()
    db.refresh(db_item)
    return db_item
@router.put("/{item_id}", response_model=ItemOut)
async def update_item(item_id: int, item: ItemUpdate, db: Session = Depends(get_db)):
    db_item = db.query(Item).filter(Item.id == item_id).first()
    if not db_item:
        raise HTTPException(status_code=404, detail="Item not found")
    for key, value in item.model_dump(exclude_unset=True).items():
        setattr(db_item, key, value)
    db.commit()
    return db_item
@router.delete("/{item_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_item(item_id: int, db: Session = Depends(get_db)):
    db_item = db.query(Item).filter(Item.id == item_id).first()
    if not db_item:
        raise HTTPException(status_code=404, detail="Item not found")
    db.delete(db_item)
    db.commit()
CORS Setup
python
from fastapi.middleware.cors import CORSMiddleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["http://localhost:3000"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
JWT Authentication Pattern
python
from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
async def get_current_user(token: str = Depends(oauth2_scheme)):
    user = decode_token(token)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid credentials",
            headers={"WWW-Authenticate": "Bearer"},
        )
    return user
@app.get("/users/me")
async def read_users_me(current_user: User = Depends(get_current_user)):
    return current_user

Security

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  • Model reviewPassed

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Source

Popularity

7-day trend score
0

Refreshed 1 Apr 2026, 7 months ago.

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